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TPI Failed emmissions agian....still running rich

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Old May 15, 2005 | 01:47 PM
  #1  
IonNight's Avatar
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Joined: Apr 2005
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From: Pennsylvania
Car: 1986 Iroc Z
Engine: Truck 305 /Bored .30 Flat Pistons/ Crane Cam
Transmission: Corvette 700R4
TPI Failed emmissions agian....still running rich

I replaced the spark plugs/wires, Cap and roater, O2 sensor and Catalytic Converter -- Fuel pump is good
I fixed the timing on the car... No codes are showing up other than the code 36 because my car wont shift into Over Drive.

I checked the fuel rail with the pressure regulator and the pressure held at 39 while idleing. I shut the car off and the pressure slowly dropped and stopped at about 8.


Here are the emmissions specs RPM 1452 Dilution 11.5
CO% Test value 3.95 = failed with limit of 1.10
HC Ppm Test value 7375=failed with limit of 275
NO ppm x liters 340 passwed with limit of 3600

Base readings are CO (0.79%) HC (1475ppm) and NO (68ppm)

Air Inj System Pass
EGR System Pass
Fuel inlet Restrictor Passs
Evaporative control system pass and gas cap pass
**Any input is welcomed***

Last edited by IonNight; May 15, 2005 at 01:51 PM.
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Old May 15, 2005 | 05:39 PM
  #2  
91Z28-350's Avatar
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leaky injectors?
bad ecu?
custom chip for your cam?

You verified the AIR diverter is going to the cat? I'm not sure what AIR Inj System pass means. How did the tech verify that it's working, other than it's there?
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Old May 15, 2005 | 09:18 PM
  #3  
IonNight's Avatar
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From: Pennsylvania
Car: 1986 Iroc Z
Engine: Truck 305 /Bored .30 Flat Pistons/ Crane Cam
Transmission: Corvette 700R4
I dont think its leaky injectors because I checked the fuel pressure on the fuel rail and got a steady 39...

Is there a way to tell if the ECU is bad?

Should I get a Chip burnt for this Cam?
All Lifts are based
on zero lash and theoretical rocker arm ratios.
Crane Compucam 2030
Lift: Intake @Cam 282 @Valve 423
Exhaust @ Cam 297 @Valve 446
Rocker Arm Ratio 1.5

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake (8) ATDC 32 ABDC 110 204 °
Exhaust 37 BBDC (3) BTDC 110 214 °

Valve Float 6500

Last edited by IonNight; May 15, 2005 at 09:40 PM.
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Old May 15, 2005 | 09:48 PM
  #4  
IonNight's Avatar
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Joined: Apr 2005
Posts: 62
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From: Pennsylvania
Car: 1986 Iroc Z
Engine: Truck 305 /Bored .30 Flat Pistons/ Crane Cam
Transmission: Corvette 700R4
I had put Edel broc TES headers on the camaro... would I now need a heated O2 sensor??


Also my Gas Gauge bounces and my oil pressure gauge bounces ...

Last edited by IonNight; May 15, 2005 at 10:02 PM.
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Old May 15, 2005 | 11:09 PM
  #5  
rgarcia63's Avatar
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Joined: Jan 2003
Posts: 2,133
Likes: 4
From: Houston, Texas
Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
It's running rich.
Did you run it for 20-30 minutes before taking testing it.
Did you change your oil?
Whats your operating temperaure? what's the Thermostat Temp? 195, 180, 160°F...etc.
Check:
for vacuum leaks
the TPS
the CTS; Any offset in the CTS especially to the cold side will cause it to run rich.

Might be a leaky fuel pressure regulator.
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Old May 16, 2005 | 05:19 PM
  #6  
IonNight's Avatar
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Joined: Apr 2005
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From: Pennsylvania
Car: 1986 Iroc Z
Engine: Truck 305 /Bored .30 Flat Pistons/ Crane Cam
Transmission: Corvette 700R4
The car ran 20-30 mins before it was tested...
I changed the oil 1000 miles ago
I dont see any vacuum leaks... i checked all my hoses
I put a 180 thermostat in it
never checked the CTS/ what is the right way to check the coolant temp sensor
I checked the fuel rail pressure while the car ran and it held steady at 39 so... doesnt that mean it cant be a leaking fuel pressure regulator?

Last edited by IonNight; May 16, 2005 at 05:27 PM.
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Old May 16, 2005 | 10:54 PM
  #7  
vernw's Avatar
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
I'd definitely recommend a 3 wire heated O2 sensor with headers. It may not be going into closed loop....
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Old May 17, 2005 | 08:02 AM
  #8  
anesthes's Avatar
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25 Year Member
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Joined: Jul 1999
Posts: 12,089
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From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Originally posted by vernw
I'd definitely recommend a 3 wire heated O2 sensor with headers. It may not be going into closed loop....
I'd recommend a scanner too, to see whats wrong with the vehicle. Those emissions results are off the charts!

-- Joe
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Old May 17, 2005 | 08:28 AM
  #9  
3.8TransAM's Avatar
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Joined: Feb 2000
Posts: 7,015
Likes: 2
From: Schererville , IN
Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
Transmission: all OD
Axle/Gears: Always the good ones
Edelbrock headers need a heated 02 period. Have the same issue on a friends car and the heated o2 will fix the closed loop issue at cruise and idle.

Any cam will affect how the car runs. Some worse than others, like the more duration the worse at idle and low speeds.

HAve you replaced the injectors with anything other than a stock size? A 24# on a stock 350 will drive the BLM to 108 in alot of cases only take sa difference of a couple of points.

Any type of canister purge issue experienced? It is pushing raw fuel out the canister into the intake?

later
Jeremy
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