Service Engine Soon

1992 Chevy Camaro V8 Two Wheel Drive Automatic

I bought a 92 camaro that hadnt been started in 6 years. It took some work but I got it running. It had no power and the exaust smelled like rotton eggs. I replaced the cat converter with a direct fit replacement. The car started and then started surging from 1000rpm to 100rpm over and over for a few seconds then died. If I keep trying to get it to start it diles real rough for a second then dies and sounds like its spitting back through the throttle body. I have replaced the ECM, EGR, TPS, MAP, Idle controll valve, Oxygen sensor, and the Air intake temp sensor. My code reader doesnt show any codes stored. The car idled fine when I drove it into the shop and replaced the cat, What could the problem be? Someone please help me!

Electrical problem
1988 Chevy Camaro V8 Two Wheel Drive Automatic

I've had my 1988 Camaro IROC garaged for several months. I had to remove some wiring from inside the door in order to remove the door to install new hinges.

I pulled the car out several months later and none of the dash gauges work. The RPM, Fuel, Oil Pressure and battery gauge wasn't working. Also, the Service Engine Light doesn't work. All of this not working suddenly has to have the same cause. Any suggestions would be greatly appreciated. Everyone is wanting 75 to a 100 dollars an hour to check it with no guarantee---especially on the amount of time to fix it.

I've checked the wiring in the door and it's fine. All the fuses are good as well. The one major difference, where I can't seem to find the common denominator is that whatever it is that is causing the gauges not to work and the Service Engine light to work is that all of these only come on when the ignition switch is in the run position. I don't think it's the ignition switch itself because the car shoudln't run if it was. Any suggestions?

Hello,

My 1987 Camaro IROC has been off the road for 8 years but recently returned it to service - engine is lacking power and running rough (smooth at idle). A check with a scan tool indicates no trouble codes but at idle shows an OPEN circuit at times and CLOSED at times (even after warming), and both LEAN and RICH Steady (doesn't switch back and forth like it is supposed to).

After 75 miles of test driving the performance is still the same - sluggish, no power and almost stalls when you let your foot off the gas - had the scan tool connected and the engine goes into the OPEN loop and both RICH and LEAN, and then CLOSED loop both RICH and LEAN at speed (varies with throttle).

It is also noteworthy that the fuell filter has been replaced, fuel injector cleaner added (Chev. Techtron) and the air intake checked for obstruction. Also, I montored the oxygen sensor values and they change with throttle and there are no "dead" values for things such as the coolant sensor, etc. Four of the eight plugs were changed (didn't look bad) and the rotor cap and rotor corrosion was cleaned off and connections checked).

Can it be that I have a bad computer or would it more likely be an oxygen sensor issue?

Thanks in advance! I really appreciate any help.

Tom (CT)

I replaced the O2 sensor (believe it was the original, over 23 years old) and the scan tool is still indicating that the car is in the OPEN loop/LEAN. It will not go into CLOSED.

Coolant Temp. Sensor appears to be working fine (reading properly), and also the MAF, MAT, EGR etc all appear normal.

The O2 volts is 0.39 to about 0.43 when you rev it. The way I understand it is if it goes above 0.450 volts the RICH light should come on.

Any ideas? Should I replace the computer?

I'm in the same condition with my 87 iroc have you found the answer.

Electrical problem
1989 Chevy Camaro V8 Manual

I have 89 camaro whats the next step if the service light dont worrk and checked the bulb it works?

I'm trying to get my son's car smogged and the diagnostic will not send any signal to a scanner. We have replaced the computer and had a friend check it with his scanner and it still won't read. Do you think it is the PROM or poss something else. The check eng light flashes very fast and the car's idle is too high and using too much fuel. ( You can smell it)

My son bought the car last year and knows nothing about working on vehicles. I know a little, but not about vehicles with computers. The veh has been sitting in my driveway for the last 6 months because it won't smog and the tags are expired. Please help get this car out of my driveway.

I appreciate your answer about the idle, but it did not answer the orginal question of the computer not sending any thing to a scanner. We have replaced the computer but not the prom. I don't know if the prom was working before my son bought it. The check eng light has been blinking since he bought it. The first time he tried to get it smogged the scanner at the smog place could not read anything.

It has been checked at 3 different shops and also with my friends scanner. None of the places could get any reading from the ECM. I'm going to check if there is power to the ECM. We checked the fuse and it is good. Will a bad PROM cause a scanner not to get a reading?

My 94 camaro's oil pressure at idel is about 20psi but after running for 10 minuts it drops to about 5psi and the service engine light comes on. The engine does not knock or ping and idels smooth. Could it be the oil regulator valve? If so, where is it?