Joseph Andres

iTrader: (6)

Anyone know where I can get a heated O2 sensor cheap for a 1988 GTA 5.7L? I think this is the problem because I have rough idle on cold starts after I installed the ZZ-9 Cam. After it warms up it runs fine. It smells very rich when it idles rough. Nothing was changed before and after the Cam install other than a Big Mouth Manifold and a TPIS level 4 PROM. Tried switching to a stock PROM and same thing. Could the O2 sensor not be getting hot enough for correct readings? The cold start up is fine on warm days (50*F and higher). The exhaust lift on the cam is now at .520.

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1988 GTA 5.7L Auto
355 ci. block, SLP Cold Air Intake w/ K&N, fully modified MAF Sensor, TPIS 52mm Throttle Body w/Air Foil, Fully Ported and Polished Plenum, Nikel-plated Ported SLP Siamesed Runners, Ported TPIS Big Mouth Intake Manifold, stock heads w/ 1.52 Comp Cams Self-aligning Roller Rockers, TPIS ZZ-9 Roller Camshaft, TPIS Valve Springs, Cloyes True Double Roller Timing Chain, TPIS Adjustable Fuel Pressure Regulator, Balanced Bosch 22 lb/hr Fuel Injectors, MSD 6AL, Taylor 10mm Wires, Bosch Platinum +4 Spark Plugs, MSD Blaster Coil, March Underdrive Pulleys, 6 3/4" Vibratech Streetdamper, TPIS Level 4 PROM, 160 T-stat, Low Temp. Fan Switch, Stock Distributor w/ Bronze Gear, SLP 1 3/4" Headers, Random Technologies High Flow Cat., Adjustable Borla Cat Back Exhaust, Level 10 PTS-3 700R4 Trans, B&M Holeshot 2400 Stall Converter, B&M Trans Cooler, TCI Aluminum Finned Trans Pan, Torque Converter Lock Up Switch, 3" Balanced Aluminum Driveshaft, 3.73 Richmond Gears, Auburn Pro-Series Differential, Aluminum Differential Cover w/ Main Cap Preloads, BF Goodrich Drag Radials 255/50 R16, Hotchkis Lower Control Arms, Hotchkis Panhard Rod, Hotchkis Tie Rod Adjuster Sleeves, Bilstein Heavy Duty Shocks and Struts, 1LE Springs, Energy Suspension Polyeurethane Bushings, Global West Tubular Subframe Connectors, Global West Steering Box Brace, HP Motorsports 3 Point Strut Tower Brace

"Why ride a stang when birds can fly?"

http://www.geocities.com/thegta

Jester

No, a heated O2 sensor won;t help you. Your chip probably just isn;t right in the open loop settings.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

Joseph Andres

iTrader: (6)

I was thinking that with the larger lift on the exhaust side, that the rich mixture was cooling the O2 sensor too much.

86TpiTransAm

Could be the O2 sensor! ANYTHING is possible with thirdgen camaros and firebirds!! You can probably pick up a heated O2 sensor at a local parts store! If not, you can pick up one through any of the mail order catalogs....jegs, summit, nextgen!!

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1986 Trans AM
305 TPI
200,000+ miles (speedo/odometer non-funtional! Odometer reads 142,000)
4 Wheel Discs
9 bolt Borg Warner Rear (2.73's....oh joy) :P
Completely Stock
Soon to upgrade to a 350 converted from TPI to Carb, Edelbrock 750CFM Carb, Edelbrock Performer RPM Intake, Headman Shorty Headers, Some sort of ported heads (undecided), XE268 Cam, Moroso HEI ignition kit with external MSD Blaster II Coil and an MSD 6-AL Box!!
Current project: Keeping my 305 running until I get my income tax returns!

JP84Z430HP

If the problem is on a cold start, it is definately NOT the O2 sensor. The O2 sensor doesn't come into play until you are in closed loop operation. If you were experiencing problems with it not staying in closed loop, that would be a reason to go with a heated O2 sensor.


Maybe your fuel pressure is too high? The ecm doesn't make adjustments in open loop if it is too rich, because it doesn't even look at the O2 sensor (other than for activity to tell when to go into closed loop) until it is in closed loop. It could make the necessary adjustments after going into closed loop.


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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand.

Starting to look like the Kicker poster child!

ASE Certified Master Tech

theformula

Good point about the fuel pressure being too high. Didn't even come to mind. He even said in his original post the car smells rich..hmm

I have told this filipino brown man spear chucker to lower his fuel pressure many times. I'll have to beat him with bamboo soon.

His car runs good once it's at operating temp. Also runs good under WOT.

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 polished kit, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL,MSD boost-master,Holley 9mm wires,Ac delco R43ts plugs,custom chip,Ford SVO 24# injectors,Bosch O2sensor, Bosch in-line pump(w/stock pump), SLP 1 5/8" headers,SLP catback,short shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

[This message has been edited by theformula (edited February 25, 2001).]

Joseph Andres

iTrader: (6)

U crack me up Formula, I'll try setting a lower fuel pressure to see if that helps, but I have didn't have this problem before I installed the cam. The fuel pressure remained the same.

Joseph Andres

iTrader: (6)

BTW I am currently running my fuel pressure at 52 psi vacuum hose off.

Joseph Andres

iTrader: (6)

Found out today that it was the O2 sensor. Wired up the Bosch Heated O2 Sensor for a ZR1 Corvette part number 13077 and installed it into the bung. This solved all of my problems of a rough idle and the computer getting into closed loop sooner. With the non-heated O2 sensor the car would not get into closed loop for about 5-10 mins. depending on outside temperatures. The car runs beautifully now. Thanks again CARTEK! http://www.Cartek.net

Joe

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1988 GTA 5.7L TPI Auto
355 ci. block, SLP Cold Air Intake w/ K&N, fully modified MAF Sensor, TPIS 52mm Throttle Body w/Air Foil, Fully Ported and Polished Plenum, Nikel-plated Ported SLP Siamesed Runners, Ported TPIS Big Mouth Intake Manifold, stock heads w/ 1.52 Comp Cams Self-aligning Roller Rockers, TPIS ZZ-9 Roller Camshaft, TPIS Valve Springs, Cloyes True Double Roller Timing Chain, TPIS Adjustable Fuel Pressure Regulator, Balanced Bosch 22 lb/hr Fuel Injectors, MSD 6AL, Taylor 10mm Wires, Bosch Platinum +4 Spark Plugs, MSD Blaster Coil, March Underdrive Pulleys, 6 3/4" Vibratech Streetdamper, TPIS Level 4 PROM, 160 T-stat, Low Temp. Fan Switch, Stock Distributor w/ Bronze Gear, SLP 1 3/4" Headers, Random Technologies High Flow Cat., Adjustable Borla Cat Back Exhaust, Flow Tech Pre-Cat 3" Exhaust Cut Off, Level 10 PTS-3 700R4 Trans, B&M Holeshot 2400 Stall Converter, B&M Trans Cooler, TCI Aluminum Finned Trans Pan, Torque Converter Lock Up Switch, 3" Balanced Aluminum Driveshaft, 3.73 Richmond Gears, Auburn Pro-Series Differential, Aluminum Differential Cover w/ Main Cap Preloads, BF Goodrich Drag Radials 255/50 R16, Hotchkis Lower Control Arms, Hotchkis Panhard Rod, Hotchkis Tie Rod Adjuster Sleeves, Bilstein Heavy Duty Shocks and Struts, 1LE Springs, Energy Suspension Polyeurethane Bushings, Global West Tubular Subframe Connectors, Global West Steering Box Brace, HP Motorsports 3 Point Strut Tower Brace

"Why ride a stang when birds can fly?"

http://www.geocities.com/thegta

[This message has been edited by Joseph Andres (edited March 07, 2001).]