TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

rough idle after cold start and tcc problems

Old Feb 10, 2006 | 06:01 PM
  #1  
49m's Avatar
49m
Thread Starter
Junior Member
 
Joined: Nov 2003
Posts: 18
Likes: 0
From: kentucky
Car: 86 irocz
Engine: 305ho
Transmission: 700r4
rough idle after cold start and tcc problems

86 305 tpi stock ecm ect.
On cold starts below 40 F engine starts perfect however after a second or two it starts to run rich and sounds like I have a good cam in it. I hold it at a higher rpm and it starts to clear up but gas is very rich. Once up to operating temp car runs fine. Starting the car warm seems to be perfect. Also after up to temp the car wants to shift early on first stage convertor lock up. This just lugs the engine down. saves some gas but not right, this seems to show up only during slow accelerations, like slowing down to turn on a street. Under mild to hard acceleration every thing shifts normal. Dont know where to start. Thanks: 49m
Reply
Old Feb 11, 2006 | 09:07 AM
  #2  
Vader's Avatar
Moderator
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 19,640
Likes: 306
The cold restart may be due to a cold start control (for the cold start injector) that is a little sluggish. If the mixture seems correct in closed loop mode.after warmup, you may want to make sure the cold start control is not recycling too fast. It relies on coolant temperature to enable it, so if the cooling system is not clean, it may be slightly insulated. Flushed lately?

As for the TCC lockup, the '86 models had a relatively low lockup point. The factory had a "fix" for this and some other inherent problems with the programming in a revised PROM offered in October of 1986 - After the last '86 model was made. There was a TSB regarding this problem.

A copy of a General Motors TSB for ‘86 LB9 (Camaro IROC is the same)
Code:
PONTIAC			ROUGH IDLE, CHUGGLE, LOW SPEED.		Page:    1
86-6(GAS)-66									Issued: 10/17/86
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
1986 FIREBIRD VEHICLES WITH 5.0L LB9
TPI ENGINE (ENGINE CODE F)

New service calibrators (Ref: Called Mem-Cal In Shop Manual) have been
released for the 1986 Firebirds with the 5.OL TPI engine. These new
calibrators will address the following customer comments:

1.  "Rough Idle" on both hot and cold engine - the idle speed is raised to 650 
    plus or minus 50 RPM.

2.  "Chuggle or Shudder" at low speeds - torque converter clutch (TCC)
    engagement speed is raised to 41 MPH.

3.  "Hesitation" on light acceleration with a hot engine.

4.  "Cold Driveability" - New calibration eliminates light to moderate sag on 
    cold driveaway.

5.  "Service Engine Soon” Lights - Eliminates the following false Codes:

     A.   Code   32 - EGR System failure
     B.   Code   33 - Mass Airflow Sensor Voltage High
     C.   Code   34 - Mass Airflow Sensor Voltage Low
     D.   Code   43 - Electronic Spark Control
     E.   Code   44 - Lean Exhaust Indication

If normal engine diagnostics and repair do not correct the above conditions,
it will be necessary to replace the calibrator in the ECM.  Below is a listing
of the new calibrators and their usages.

ON AIR CONDITIONING (C-6O) FIREBIRDS

With  QYZ (P215/65 R 15/N 15" Tire) 		Use -  1228290  Calibrator
With  QAC (P235/60 VR 15N Tire)			Use -  1228291  Calibrator
With  QDZ (P245/50 VR 16N Tire)			Use -  1228291  Calibrator

ON NON-AIR CONDITIONING (C-41) FIREBIRDS

With  QYZ (P215/65 R 15/N 15" Tire)		Use -  1228292  Calibrator
With  QAC (P235/60 VR 15N Tire)			Use -  1228293  Calibrator
With  QDZ (P245/50 VR 16N Tire)			Use -  1228293  Calibrator

Use Applicable Labor Time and Operation Numbers.

For use in 1227165 ECM only.


-  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
ECM/Cal-Pak (PROM) for Model Year / Engine


YR.    ENGINE		OPTIONS				P/N			PROM CODE(S)
- - -     - - - - - -    - - - - - - - - - - - - - - - - - - - - - - - - -        - - - - - - - - - - - - - - - - - -                - - - - - - - - - - - - - - - - - 
86	5.0-F	A/C, VD1,VE1 (Export)			16061103			1107BLL

86	5.0-F	A/C, VB4, BT7 (Export)			16061117			1120BLN

86	5.0-F	Fed, Calif, A/C, 215/65/15 tires		1228290			3234ANY / 8958AMU
											8969ANB / 8980ANY
											8993AUM

86	5.0-F	Fed, Calif, A/C, 235/60/15&16 tires	1228291			3236AUM / 8958AMU
											8969ANB / 8980ANY
											8993AUM

86	5.0-F	Fed, Calif, Exc A/C, 215/65/15 tires	1228292			3240BTZ / 8964ANA
											8975AND / 8987BTZ
											8998AWC

86	5.0-F	Fed, Calif, Exc A/C, 235/60/15&16 Tires	1228293			3243AWC / 8975AND
											8987BTZ / 8998AWC

86	5.0-F	VD1, VE1 Exc A/C (Export)		16059564			9567BUR

86	5.0-F	VB4, VT7 Exc A/C (Export)		16059576			9580BUT

86	5.0-F	Fed, Calif, A/C, 3.42(GU6)		16059000			9004AWD

86	5.0-F	Fed, Calif, Exc A/C, 3.42(GU6)		16059006			9009AWF

-  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
This item is from a Technical Service Bulletin, not a recall. Not all owners reported problems with their vehicle's performance, so there was no recall. However, just because problems were not reported, they still exist if the PROM has not been changed. If you remove the cover from the ECM, you can remove the PROM carrier. Inside the carrier are three ICs. One is a resistor network, one is an I/O buffer, and the large one if the PROM (memory chip). The PROM should have a label with a revision number, something like "DELCO AUM 6339". There should also be a set of numbers inked on the PROM. Four of these are the date code. If the date code is not 8646 (1986, 46th week) or higher, your PROM has never been changed.

The replacement has been programmed to raise the idle, enrich the mixture at mid range, hold off the torque converter clutch lockup to 41 MPH from 28 MPH, allow for a wider range of MAF signals, MAT signals, allow for a lower coolant temperature before entering full closed-loop operation, allow for richer O2 readings, and much more. Basically, you will notice a real difference in how your car operates.

I had a Hypertech Thermo Chip in my TA when I found out about the new PROM, and the GM reprogramming is better than the Hypertech in my opinion. The replacement only cost $63.00 from the dealer, and they were still available as of April of 1999.

Check this U.S. government web site for more details on TSBs and recalls:

http://www.nhtsa.dot.gov/cars/proble...ervicemmy1.cfm

The original PROM was replaced with an upgrade in October of 1986. My '86 TA was built in July, so I had the "bugged" PROM. Actually, there is nothing wrong with the original PROM, but the parameters were changed in the new programming. Instead of the torque conveter locking at 28MPH, it holds off until 41MPH. The threshold parameters for the O2 sensor, MAT, MAF, ESC, and EGR were all changed. The nuisance setting of Code Code 32 - EGR System failure, Code 33 - Mass Airflow Sensor Voltage High, Code 34 - Mass Airflow Sensor Voltage Low, Code 43 - Electronic Spark Control, Code 44 - Lean Exhaust Indication, were all virtually eliminated, and the idle was raised to 650 RPM. I had a Hypertech PROM in my ECM, but had switched back to the OEM after some experiences with Hypertech on a different vehicle.

I never experienced the codes, but my car runs completely different with the new PROM, like I installed a different engine. The part number for the replacement is exactly the same as the original. GM often changes part specifications without changing part numbers. The key is to look inside the PROM carrier (Cal-Pak) and check the label on the PROM itself. The revision level of the software is coded there. You should also check the date code inked on the PROM. It should be any number greater than 8644.
Code:
                             ON AIR CONDITIONING (C-6O) FIREBIRDS

                             With QYZ (P215/65 R 15/N 15" Tire) Use - 1228290 Calibrator

                             With QAC (P235/60 VR 15N Tire) Use - 1228291 Calibrator

                             With QDZ (P245/50 VR 16N Tire) Use - 1228291 Calibrator

                             ON NON-AIR CONDITIONING (C-41) FIREBIRDS

                             With QYZ (P215/65 R 15/N 15" Tire)Use - 1228292 Calibrator

                             With QAC (P235/60 VR 15N Tire) Use - 1228293 Calibrator

                             With QDZ (P245/50 VR 16N Tire) Use - 1228293 Calibrator
Mine was 1228291, and cost $63.00 at the dealer in April of '99. They are still available.


If you are curious about any TSBs or recalls on any vehicle, check http://www.nhtsa.dot.gov/cars/proble...ervicemmy1.cfm .
Our tax dollars pay for this, so we might as well use it.

BTW - If your dealer has no clue. I ran into the same thing. I had to show them a copy of the TSB pulled from the NTSB web site before they would look up the part. The next dealer I went to was much more helpful and knowledgeable. You just never know...
Reply
Old Mar 6, 2026 | 08:20 PM
  #3  
pete2833's Avatar
Member
iTrader: (1)
 
Joined: Dec 2024
Posts: 141
Likes: 9
From: Gibsonia Pa
Car: 1986 Camaro Iroc
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 3.23
Re: rough idle after cold start and tcc problems

I know this is a thread from a long time ago.
I have an 86 Iroc that exhibits the TSB behaviors above. It pulled the prom and it is an AMU 8958
with a date code if 8546.
I would assume this is a prom that should be updated ? Bc of the issues with them.

Thx

Pete
Reply
Old Mar 8, 2026 | 01:09 AM
  #4  
Vader's Avatar
Moderator
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 19,640
Likes: 306
Re: rough idle after cold start and tcc problems

That is an early 1986 model year code, and likely has all the issues that the TSB addressed.

I would guess that the CALPAK is nowhere to be found in any inventories today. A quick search for that part number (1228291) showed that while several GM parts dealers still show it in their systems, none of them have any available. The good news is that the CALPAK itself is not any different, just the PROM. You could have a PROM burned just like the factory replacement was, and have exactly the same thing. I still have the 16K binary file if you need it to dump to a fresh PROM, as well as a handful of others.
Reply
Old Mar 8, 2026 | 11:01 AM
  #5  
Tuned Performance's Avatar
Sponsor
20 Year Member
Community Builder
Community Influencer
Community Favorite
iTrader: (94)
 
Joined: Dec 2004
Posts: 16,694
Likes: 979
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: rough idle after cold start and tcc problems

It’s superseded to ANY but I don’t see a service bulletin on it. The low tcc definitely doesn’t help performance
Reply
Old Mar 8, 2026 | 03:48 PM
  #6  
Vader's Avatar
Moderator
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 19,640
Likes: 306
Re: rough idle after cold start and tcc problems

My roommate can attest to that. Long, long ago, in a galaxy far away (maybe it was a Fairlane?) she was was driving my car and couldn't explain to the officer how it wouldn't do less than 35MPH without even having a foot on the pedals. Lockup at 28 MPH was not a good thing, in 4th gear, in a 30 MPH zone. Manually pulling it out of OD was the only solution before the reprogramming.

And there then was the lag, the tip-in stumble, the cold starts, and all the other joys of inadequate testing after programming by those "smarter" teams that never got out of the cubicle. Ask the boys and girls at Airbus how that worked out at the Paris Air Show on the A320, or Boeing on the 737-MAX. Oh, wait... They don't work there any more.
Reply
Old Mar 8, 2026 | 04:01 PM
  #7  
Vader's Avatar
Moderator
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 19,640
Likes: 306
Re: rough idle after cold start and tcc problems

[QUOTE=Tuned Performance;6581028]It’s superseded to ANY but I don’t see a service bulletin on it. .../QUOTE]

Below is a list of all the applicable bulletins issued for the 1986 Firebird, Due to post size limitations if the board software, it is split into two posts. No. 260 is of particular interest:

Bulletins for 1986 Pontiac Firebird V8-305 5.0L

Safety Recalls

TSB Number Issue Date TSB Title
1. 90C03A FEB 91 Campaign 90-C-03A Seat Belt Buckles Defective

General Recalls

TSB Number Issue Date TSB Title
1. 86SM19 AUG 86 Engine Surge After Hot Soak

Service Bulletins

TSB Number Issue Date TSB Title
1. 73-50-37 JAN 98 Brake Rotor and Hub Cleaning Tool Revision
2. 72-05-14 JAN 98 Enhanced Sublet Repair Policy
3. 72-05-13 JAN 98 Repair/Replace Policies and Procedures
4. 72-05-12 JAN 98 Shock Absorbers and Struts Operations
5. 72-05-07 DEC 97 ACDelco Remanufactured Engines
6. 48-05-02B DEC 97 Parts Expediting Reimbursement Policy
7. 72-05-11 DEC 97 Rail Dust Removal and Chemical Spotting - labor
8. 71-05-02 DEC 97 Recall Campaign Follow-Up Post Card
9. 73-01-10 DEC 97 Technical Assistance Call Preparation
10. 62-05-02A NOV 97 Labor Operation Z1241 - Personal Property Damage
11. 73-12-13 NOV 97 PureGuard 2 Operating Alert
12. 73-62-13A SEP 97 Servicing of Aluminum Heater Cores and/or Radiators
13. 72-05-02 AUG 97 AC Delco Remanufactured Transmissions
14. 76-02-02 AUG 97 Recommended Axle Lubricant
15. 73-62-13 JUL 97 Aluminum Heater Core and/or Radiator Replacements
16. 73-62-14 JUL 97 Approved Engine Coolant Recycling Processes
17. 77-71-59 JUN 97 Automatic Transmission Oil Cooler Flushing/Flow Check
18. 36-71-06B JUN 97 Automatic Transmission Service Procedure
19. 73-10-54 MAY 97 Two-Part Urethane Adhesive For Windshield Installations
20. 631208A APR 97 A/C Tool And Equipment Maintenance
21. 620504 APR 97 Operating Procedures
22. 731204 FEB 97 Air Conditioning Systems With R12 Or R134a Service Issue
23. 731049 FEB 97 Body Sealer Tape For Collision Repairs
24. 649601 JAN 97 Compact Disk Players Procedures
25. 600503 JAN 97 Warranty Repairs And Claims Procedures
26. 310503C DEC 96 Warranty Claim Processing
27. 631215 NOV 96 A/C Compressor Seal Washer Reference Chart
28. 610111 NOV 96 Key Code Information
29. 668304A SEP 96 ACDelco Service Center Locations Odometer/Speedometer
30. 400501A SEP 96 Corporate Parts Return Program Instructions
31. 636532 MAY 96 Enhanced Emission Inspection Maintenance - Equipment
32. 638111 APR 96 Headlamp Lens Distortion Caused by Aiming Equipment
33. 516547 JAN 96 Revised Tech 1 Cartridge for Oxygen Sensor Test
34. 536507 DEC 95 Enhanced Emission Inspection Maintenance - Update
35. 538209 OCT 95 Daytime Running Lamp Retrofit Kits
36. 186103 OCT 95 Oil Economy - Normal Oil Consumption
37. 588302A JUL 95 AC Delco Locator Service for Delco Electronics Exchange
38. 349212 JUN 95 Radio Frequency Interference (RFI) Diagnosis
39. 570102 JUN 95 Reformulated, Oxygenated Gasoline and Calif. Phase 2 RFG
40. 580101 JUN 95 Use of a Diagnostic Worksheet
41. 570502 JUN 95 Warranty Information Network System - Stage 2
42. 531205 MAY 95 Contaminated R12 Refrigerant Testing & Handling
43. 570501 APR 95 Goodwill Adjustments Case-by-Case Administration
44. 436201B APR 95 Propylene Glycol Engine Coolant
45. 570201 MAR 95 General Information - DEXRON III A/T Fluid Introduction
46. 431218A MAR 95 J 39400 A/C Leak Detector Maintenance Kit Availability
47. 516502 FEB 95 I/M Emissions Diagnostic Manual
48. 480105 JAN 95 Automating Key Code Retrieval
49. ATRATB294 JAN 95 Axle Nut/ Lug Nut Tightening Specifications
50. 436510 JAN 95 I/M 240 Program - Equipment Purchase
51. 310503A JAN 95 Warranty Claims Processing
52. 436507 DEC 94 Enhanced Emission Inspection Maintenance Program
53. 435009 DEC 94 Front Brake Pulsation - New Diagnosis and Repair
54. 431048 NOV 94 Adhesive Caulking Kit Revisions
55. 436506 OCT 94 I/M 240 Repairs - Obtaining Technical Assistance
56. 446501 OCT 94 PROM/MEMCAL - Identification Marks
57. 431223 SEP 94 Contaminated A/C Refrigerant
58. 410103 SEP 94 Product Campaign Bulletin Numbering System
59. 330105A SEP 94 Using GM Service Bulletins
60. 149301 JUL 94 Release of Service Package For Nickel Tape
61. 433502 JUL 94 Speed Rated Tires
62. 431018A MAY 94 Vehicles Equipped With A Webasto Sunroof System
63. 436505 APR 94 Enhanced Emission Inspection Maintenance Programs
64. 033206 MAR 94 Reduced Power Steering Assist (Cold)
65. 435001 FEB 94 Aftermarket Anti-Lock Brake System Products
66. 310504 FEB 94 Policy - Recycled Engine Coolant
67. 331226 JAN 94 Retrofitting R-12 Vehicles to R-134A
68. 383001 DEC 93 Steering System Bleed Procedures
69. 306502 OCT 93 How Fuel Economy Is Determined
70. 393504 JUL 93 Leaking Cast Aluminum Wheels
71. 349212R JUL 93 Radio Frequency Interference - Identification/Diagnosis
72. 331209R JUN 93 A/C R-134A Refrigerant Information
73. 316501R JUN 93 Introduction Of The Fuel Injector Tester Tool
74. 330103 JUN 93 Recycling of Used Oil Filters
75. 377123 JUN 93 Servicing Vehicle With Contaminated Transmission Fluid
76. 931020 MAR 93 Door Lock Cylinders Binds, Sticks, Hard to Insert Keys
77. 93631 MAR 93 Injector Tester Available
78. 931011A FEB 93 Acid Rain - Damage to Base Coat/Clear Coat Paint
79. 9341 FEB 93 Differential Pinion Shaft Locking Screw Precaution
80. 93712 FEB 93 Shift Control Cable - Installation Precaution
81. 9375 OCT 92 Buzzing Noise At Idle - With 4L60 Transmission
82. 9367 OCT 92 Effect of Fuel Volatility On Driveability
83. 9368 OCT 92 Engine Miss, Hesitation or Roughness From Pierced Wires
84. 93101 OCT 92 Procedures On Scuff/Scratch Removal - Aluminum Wheels
85. 9313 SEP 92 HVAC Blower Motor Replacement Parts
86. 9312 SEP 92 No Alternate Refrigerants to R-12 to Date
87. 92657 AUG 92 Precautions On Use of ST125 Spark Tester (J26782)
88. 9217 JUN 92 A/C Leak Test
89. 92316 JUN 92 Avoiding Damage to Steel Wheels Proper Changing Procedre
90. 92313 MAR 92 Info On Coated Balance Weight For Aluminum Wheels
91. 92312 MAR 92 Information On Refilling CO2 Tire Inflators
92. 88519A MAR 92 Rear Disc Brake Calipers Revised
93. 9292A JAN 92 Exchange Program Phone Number Change
94. 9234 JAN 92 Tire Company Warranty Assistance Programs
95. 91WA11 DEC 91 Labor Time Guide Updates
96. 921026 DEC 91 Loose and/or Wavy Sealing Strip
97. ATRATB078 NOV 91 How To Use A Pressure Gauge - Automatic Trans.
98. 92WA1 OCT 91 Battery Replacement
99. 9272 OCT 91 Dexron-Iie Automatic Transmission/Transaxle Fluid
100. 9282 SEP 91 Detecting Electrical Intermittent Problems
101. 9292 AUG 91 Advance Exchange Programs For AC Delco
102. 9294 AUG 91 Cellular Telephone Program
103. 91648 AUG 91 Damaged ECM/PCM and/or Mis-Diagnosed
104. 911034 AUG 91 Diagnosis and Correction On Wind Noise
105. 91737 AUG 91 Evaluating Peened Spacer Plates
106. 91736 AUG 91 New Output Shafts and Input Housing to Output Shaft Seal 4L60
107. 92103 AUG 91 New Seat Belt Restraint System
108. 911037 AUG 91 New T-Top Weatherstrips
109. 9264 AUG 91 Oil Economy Information
110. 91738 AUG 91 Service Information On 3-4 Clutch/2-4 Band 4L60
111. 91735 AUG 91 Transmission Stuck In First Gear With 4L60
112. 911031 JUL 91 Waterleaks On Twin Lift-Off Panel
113. 911028 JUN 91 Increase Painting Efficiency
114. 91646 JUN 91 No Start Condition Due to A Dead Battery
115. 91640 MAY 91 Damage to ECM/PCM Circuit Board When Installing A Mem-Cal
116. 911019A MAY 91 New Weatherstrip and Seal Kit
117. 911025 MAY 91 T-Top Sealing Strips
118. 91730 APR 91 Binding or Inoperative In Reverse
119. 911021 APR 91 Cleaning Instrument Panel Surfaces
120. 91WA8 APR 91 Defective Service Parts Installed
121. 9119 MAR 91 A/C Refrigerant Loss
122. 91510 MAR 91 Modified Brake Bleeding Tool
123. 911016 MAR 91 Squeaks From Rear of Doors
124. 911014 FEB 91 Door Glass to Weatherstrip Squeaking
125. 91626 FEB 91 Multec Fuel Injectors/Cleaning Information
126. 91725 FEB 91 New Roller Clutch
127. 91312 FEB 91 Reduced Power Steering Assist At Low Temperatures
128. 9154 DEC 90 Recommended Procedures to Assure Proper Brake Performance
129. 911010 DEC 90 T-Top Weatherstrips and Attachments
130. 91108 NOV 90 Cleaning For Procedure Chattering Wiper Blades
131. 9113 OCT 90 A/C Odor Afterblow Module Information
132. ATRATB028 OCT 90 Engine Testing With A Vacuum Gauge - Auto Trans.
133. 886103 SEP 90 Wiring Manual Update
134. 9182 AUG 90 Aftermarket Accessories Installation Guidelines
135. 9131 AUG 90 Aluminum Wheel Coated Wheel Weights
136. 9101 AUG 90 State Emissions Testing Information
137. 91102 JUL 90 T-Top and Roof Area Water Leaks
138. 90511 JUN 90 Poor Brake Rotor Refinish Wrong Cutters
139. 90SM4 MAY 90 Procedures For Paint Removal
140. 90111 APR 90 Charging Capacities Chart
141. 90627 APR 90 Chart C-1D, Code 33, 34,63,64 Manual Update
142. 90WA8 MAR 90 Confusion Regarding Fuel Pump Warranty
143. 89647A MAR 90 Installation Instructions On 75 mm Oil Filter
144. 90628 MAR 90 Parasitic Current Drain Revised Ampmeter Connection
145. 90WA7 MAR 90 Pics Program
146. 90WA5 MAR 90 Revised Labor Operations Reference
147. 901019 MAR 90 Tire to Wheelhouse Contact
148. ATRATB9002006 FEB 90 Automatic Transmission Fluid
149. 90SM3 FEB 90 Driveability Worksheet
150. 90727 FEB 90 New Rear Case Extension Bushing Tool

(continues next post)
Reply
Old Mar 8, 2026 | 04:02 PM
  #8  
Vader's Avatar
Moderator
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 19,640
Likes: 306
Re: rough idle after cold start and tcc problems

Continued:

Bulletins for 1986 Pontiac Firebird V8-305 5.0L (continued)

151. 90WA4 JAN 90 Dealer Override of Deductibles
152. 90WA2 JAN 90 Labor Time Guide Request For Review, July - December
153. 90720 DEC 89 2-4 Band, Apply/Anchor Brackets, and Lube Window Changes
154. 90108 NOV 89 Loose Carpet On Side Wall Trim Pads
155. ATRATB8930 OCT 89 Automatic Transmission Math Part 2
156. 8906 OCT 89 Use of Methyltertiary-Butyl Ether At 15% or Less In Gasolines
157. 90SM1 SEP 89 "Reconstituted Anti-Freeze"
158. ATRATB8927 SEP 89 20 Steps To successful Auto Transmission Repair
159. 9064 SEP 89 Packard 32 Way Connector Identification For All GMP4 ECM Applic
160. ATRATB8923 AUG 89 Automatic Transmission Math Formulas
161. 89115 AUG 89 CFC Reduction and Refrigerant Recovery/Recycling Program
162. 89745 AUG 89 New Spacer Plate Identification TAB
163. 89666 AUG 89 Packard 32 Way Connector Identification
164. 891022 JUN 89 Chipped Paint Diagnosis and Repair
165. 89111 JUN 89 No Cooling Fan Operation In Defrost Mode
166. 89736 JUN 89 Proper Usage of Spacer Plate Gaskets In Overhaul Kit
167. 89735 JUN 89 Replacement Gear Washers and Sun Gear
168. 89SM7 MAY 89 Label and VIN Plate Replacement Procedures All 1980 - 1989 Mode
169. 87756 MAY 89 Possible Inoperative Torque Converter or Related Condition (Dia
170. 89WA7 APR 89 Goodwrench Vehicle Security System Labor Operations All 1980 -
171. 8959 APR 89 Light Brake Drag - Brake Stays Applied - Brake Switch Adjustmen
172. 88695 APR 89 Moan or Vibration With A/C Running Without Serpentine Drive (In
173. 89315 APR 89 Power Steering Fluid (Proper Fluid Usage)
174. 89722 MAR 89 New Case Assembly - Removal of 2ND, 3RD and 4TH Clutch Pressure
175. 89624 FEB 89 High Charger Setting to Recharge Batteries
176. 8955 JAN 89 Brake Pulsation
177. 8937 JAN 89 Cast Aluminum Wheel Porosity (Repair Procedure and Sealer P/N L
178. 89619 JAN 89 Fuel Pump Strainer (In-Tank Filter/Sock) Replacement; (Info Onl
179. 89717 JAN 89 New Control Valve Assembly - Elimination of TCC Bore.
180. 89SM5 JAN 89 On-Car Brake Rotor Turning Tool
181. 88663A JAN 89 Starter Grinds/Clashes When Attempting to Crank (New Starter an
182. 89SM3 DEC 88 Engine Coolant Substitutes - All Vehicles
183. 89615 NOV 88 Fuel Feed and/or Return Pipe Repairs
184. 8951 OCT 88 Brake Lead Diagnosis
185. 88741 OCT 88 Clutch Wear, Leaking Hydraulic Clutch Slave Cylinders and Clutc
186. 89610 OCT 88 Engine Cooling System Leaks (Diagnostic Procedure)
187. 88740 OCT 88 Neutral/Drive Manual Transmission Gear Rattle
188. 8912 OCT 88 V5 Air Conditioning and Refrigerant System Diagnostic Procedure
189. 88674 SEP 88 Front Air Deflector/Engine Overheat (New Air Deflector)
190. 881051 SEP 88 Seat Chucking Noise Two-Way Manual Seat Adjuster
191. 8961 SEP 88 Static Electrical Damage
192. 8931 SEP 88 The Importance of Four Wheel Alignment
193. 876GAS91 AUG 88 Code 33 Mass Air Flow (MAF) Sensor Voltage High Diagnostics (DI
194. 881048 AUG 88 Loose and/or Wavy Door Glass Belt Sealing Strip
195. 88738 AUG 88 Service Replacement Transmission Assembly (Srta) Update
196. 88653 JUN 88 Manual Update - 6E Section B, Rough, Idle
197. 876GAS90A JUN 88 Poor Driveability Up On Cold Start At High Ambient Temp.
198. 88510 JUN 88 Rear Caliper Park Brake Service Adjustment Procedure
199. 86C08A JUN 88 Supplemental Information Regarding Parts That Dealers May Order
200. 88114 MAY 88 A/C Odor
201. 87689 MAY 88 Fuel Pump Noise
202. 8893 MAY 88 Power Antenna Will Not Retract
203. 88720A APR 88 Erratic or No Upshift (New Governor Driven Gear)
204. 871038 APR 88 Left Side Cowl Water Leaks
205. 876GAS87 APR 88 Summary of Warm Ambient Driveability Problems
206. 88720 MAR 88 Erratic or No Upshift - Service and Parts Information For A New
207. 876GAS86 MAR 88 Hesitation On Sharp Tip-In Manuevers
208. 87683 JAN 88 Mass Air Flow (MAF) Sensor System Diagnosis Codes 33, 34 and 36
209. 881013 JAN 88 Removal of "Chemical Spotting" and Other Minor Paint Imperfecti
210. 8886 DEC 87 Damage to Wiring Terminals On Engine Sensors - Metri-Pack 150 S
211. 86682 OCT 87 Canister Control Valve Diagnosis Procedure
212. 871024 OCT 87 Front Seat Back Noisy
213. 871023 OCT 87 Gear Shift Boots Crack In Cold Weather
214. 8742 OCT 87 Limited Slip Differential Case Service
215. 88106 OCT 87 Undercoating/Fuel Tank Vent Valves
216. ATRATB8754 SEP 87 All Automatics - Front Bushing Wear
217. 876GAS63 SEP 87 Fuel Pump Run-On
218. 87670 SEP 87 Functional Checking the ESC System - Section 6E1
219. 87320 SEP 87 Rattle From Turn Signal Lever
220. 8861 SEP 87 Service Replacement Electronic Modules (ECM) With PROM Installe
221. 87742 SEP 87 Service and Parts Information On New Pump Assembly Vane Rings
222. 87741 SEP 87 Transmission Pump Noise - Service and Parts Information On A NE
223. 86751 AUG 87 Late 1-2 Full Throttle Shifts
224. ATRATB8748 AUG 87 Metal Sealing Rings - Automatic Transmissions
225. 87658 AUG 87 New Cylinder Head Gaskets
226. 87733 JUL 87 Second Gear Starts
227. 87731 JUL 87 Service and Parts Information On A New Servo Apply Pin
228. 87643 JUN 87 Cold Start Injector O-Ring Package
229. 866GAS74 JUN 87 Hesitation On Light Acceleration
230. 866GAS75 JUN 87 Long Crank and Idle Roughness After Coldstarts At High Ambients
231. 87WA12 JUN 87 Past Model (1979 and Older) Warranty Claims Processing
232. 866GAS76 JUN 87 Surge, Hot Fuel Handling - Engine Troubleshooting
233. 87636 MAY 87 CS-121 and CS-130 Generators
234. 876GAS39 MAY 87 Engine Miss, Backfire, Hard Start, Hesitation or Stall
235. 8753 MAY 87 Front Brake Noise
236. 876GAS37 MAY 87 Hot Fuel Handling Kit, Two Wires Reversed
237. 87640 MAY 87 Revised ECM Replacement Procedure - Chart C-1
238. 87616A APR 87 Inoperative Voltage Regulators
239. 87631 APR 87 Service Engine Soon Light - Code 36 (MAF Sensor Burn-Off Fault)
240. 876GAS30 APR 87 Throttle Body Carbon Buildup
241. 86668 MAR 87 Fuel Injector Plugging
242. 87625 MAR 87 Quick Checks "CS" Charging Systems With Charge Indicator Lamp
243. 87810 FEB 87 Composite Headlamp Condensation
244. 8713A FEB 87 Moan or Vibration With Air Conditioning Running
245. 8789 JAN 87 Electric Hatch Release Operation
246. 87711 JAN 87 Pump Whine or Moan
247. 8714 JAN 87 Schrader Valve Core Removal Tool and A/C Hose Adapter Tool
248. 86747 JAN 87 Slipping and/or Loss of Drive Range
249. 86746 JAN 87 Summary of Throttle Valve (T.V.) System-Related Conditions and
250. 86823 DEC 86 Correct Mounting of Headlamp Door Motor Relays
251. 866GAS29A DEC 86 Poor Driveability After Starting A Hot Engine
252. 8737 DEC 86 Uneven Wear-Outer Ribs On Front Tires
253. 876GAS6 NOV 86 Gasolines Marketed to Keep Port Fuel Injectors Clean
254. 86WA8 NOV 86 Some Policy Adjustment Considerations
255. 86SM15B NOV 86 Warranty Crediting End of Month Accounting
256. 87WA2A OCT 86 Battery Warranty and Failure
257. 86WA10 OCT 86 Claim Type "M"
258. 86216 OCT 86 Color Coat Chips Off
259. 86820 OCT 86 Delco Freedom Battery Storage, Testing, and Diagnosis and Charg
260. 866GAS66 OCT 86 Engine Calibration Change to Improve, Driveability Problems
261. 86662A OCT 86 Engine Overheat
262. 86737 OCT 86 Fluid Leaks From the Oil Pump Body
263. 86WA9 OCT 86 Policy Administration
264. 87SM6 OCT 86 Pontiac Super Duty Parts
265. 8616 SEP 86 Air Conditioning Moan/Vibration
266. 86215 SEP 86 Color Sanding Basecoat/Clearcoat Finishes
267. 86WA7 SEP 86 New Dealer Communication System Warranty Claim Memorandum
268. 86WA5 AUG 86 "S" Labor Operations
269. 86733 AUG 86 Consistent Shift Points and Smoothness Using New Accumulator Pi
270. 86SM20 AUG 86 Lower Radiator Air Deflector
271. 8696 AUG 86 Modification of Diagnostic Routine On the Cruise Control
272. 86WA6 AUG 86 Product Campaign Responsibilities
273. 86657 AUG 86 Service Engine Light and Poor Driveability
274. 86313 JUL 86 Clear Coating of Aluminum Wheels
275. 866GAS51 JUL 86 Engine May Run Rough, Misfire Intermittently, May Not Start
276. 86729 JUL 86 Fluid Leaks From Fill Tube
277. 86654A JUL 86 Hard Start/No Start - Suspected Vapor Lock
278. 861010 JUL 86 Twin Lift-Off Panel (cc1) Water Leaks
279. 86213 JUN 86 "Incorrect Bright Red Paint" Identification Number
280. 86722 JUN 86 1982 Through 1986 THM 700-R4 Transmissions New Pump to Case Bol
281. 86650 JUN 86 1986 Service Manual Chart Update Code 52
282. 86648 JUN 86 New Oil Drain Plug Gasket to Replace Copper Gasket
283. 86513 JUN 86 Premature Brake Wear
284. 86725 JUN 86 Shudder In Reverse Condition
285. 86106 JUN 86 Weak Counterbalance Supports On Rear Hatch Lids
286. 86510 MAY 86 Brake Pulsations
287. 8659 MAY 86 Disc Brake Squeal During Application
288. 86639 MAY 86 Fluid Leak Detection
289. 86814A MAY 86 Metri-Pack Series 150 Terminal Removal
290. 8627 MAY 86 Polishing Basecoat Clearcoat Exterior Finishes
291. 86610B MAY 86 Spark Plug Gap
292. 86718 APR 86 All THM Transmission/Transaxle Assemblies Control Valve Assembl
293. 8625A APR 86 Dealer Installed Deck Lid Luggage Rack
294. 86721 APR 86 Elimination of the Throttle Valve Sleeve On 700R4 Transmissions
295. 8686 MAR 86 1986 Instrument Cluster Service Instructions
296. 86720 MAR 86 Engine Stops Running Due to TCC Engagement
297. 8634A MAR 86 Front Position Tire Wear
298. 866GAS17 MAR 86 Hot Fuel Handling Kit
299. 86624 MAR 86 Inoperative Fuel Injector Cleaner Essential Tool J-35800
300. 86716 MAR 86 New Oil Pan Gasket to Eliminate Fluid Leaks
301. 86SM13A MAR 86 Ordering Replacement Wiring Harness Connectors
302. 86623 MAR 86 Remanufactured TBI Fuel Injectors
303. 86SM16 MAR 86 Service Manual Comment Form
304. 86712 FEB 86 1982-86 Hydra-Matic Automatic Transmission Bulletin Summary Lis
305. 8679 FEB 86 Automatic Transmission--Identification Information, Including 3
306. 866GAS14 FEB 86 Cleaning of Port Fuel Injectors
307. 8601 FEB 86 General Motors Service Approved Sealants
308. 86SM4A FEB 86 Mechanical Speedometer Repair Program
309. 86SM10A FEB 86 Quartz Electric Speedometer Cluster Repair Program
310. 86SM14 FEB 86 Revision to Several 1986 Dealer Service Management Bulletins
311. 86WA1 FEB 86 Warranty Administration and Claims Procedure Bulletin
312. 86611 JAN 86 Antifreeze Concentration and Cooling System Effects
313. 8626 JAN 86 Assembly Plant Paint Identification
314. 86612 JAN 86 Effects of Top Engine Cleaner On the Catalytic Converter
315. 8624 JAN 86 Lubrication of Door Deck Lid and Fuel Filler Door Lock Cylinder
316. 8654 JAN 86 Tandem Diaphragm Power Brake Booster Assembly
317. 8689 DEC 85 1986 Firebird Quartz Cluster
318. 86SM11 DEC 85 Labor Time Allowance Dated 12/85
319. 8691A NOV 85 AC-Delco Radio Repair Information
320. 8688 NOV 85 Quiet Turn Signal Flasher
321. 8669 NOV 85 Revised Service Manual Information - Diagnostic Charts Section
322. 86SM9 NOV 85 Vinyl Trim and Vinyl Top Repair Information
323. 866GAS6 OCT 85 Integrator/Block Learn
324. 8667 OCT 85 RTV Sealants
325. 8631 OCT 85 Removal of Tire/Wheel Weight Marker Residue
326. 86SM1 AUG 85 Electronic Control Module (ECM) Exchange Program
327. 81I37 FEB 81 Silica Contamination of Oxygen Sensors
Reply
Old Mar 8, 2026 | 04:04 PM
  #9  
Vader's Avatar
Moderator
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 19,640
Likes: 306
Re: rough idle after cold start and tcc problems

A separate listing can be found here:

https://www.tsbsearch.com/Pontiac/86-6-GAS-66
Reply
Old Mar 8, 2026 | 04:43 PM
  #10  
pete2833's Avatar
Member
iTrader: (1)
 
Joined: Dec 2024
Posts: 141
Likes: 9
From: Gibsonia Pa
Car: 1986 Camaro Iroc
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 3.23
Re: rough idle after cold start and tcc problems

Originally Posted by Vader
A separate listing can be found here:

https://www.tsbsearch.com/Pontiac/86-6-GAS-66

That's a lot !
I wouldn't mind reading some of them. Is there a way to see them or does GM have them locked down !!
Reply
Old Mar 8, 2026 | 04:53 PM
  #11  
Tuned Performance's Avatar
Sponsor
20 Year Member
Community Builder
Community Influencer
Community Favorite
iTrader: (94)
 
Joined: Dec 2004
Posts: 16,694
Likes: 979
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: rough idle after cold start and tcc problems



Thanks to @Vader for this information
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
powerslave
DIY PROM
2
Dec 12, 2009 05:12 PM
86z28iroc-z
Engine/Drivetrain/Suspension Parts for Sale
3
Aug 30, 2007 10:50 AM
ausZ28
TPI
4
Apr 24, 2006 12:06 AM
mikobu3
DIY PROM
1
Apr 16, 2003 10:58 AM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 10:35 PM.