Hi Guys, sorry this is a little long...
I need a little help interpreting a problem with my 1992 Camaro RS. It's a 305/auto car. I've converted it to TPI unsing parts from a running 92 Z28. It runs pretty good until it warms up.
Once it reaches operating temperature, its starts to idle erratically. The problem is most pronounced while stopped at a traffic light. The engine will nearly stall, surge to recover, and eventually will stall. Putting it in neutral or giving it a little gas helps. The car drives down the road with no issues.
It's throwing code 13 and code 42. The code 13 I've heard is due to my headers and will be solved by installing a heated O2 sensor. I hope to accomplish this this weekend. The code 42 is what I don't get. The dizzy, module, cap, coil, rotor, plugs, and wires are all new. Maybe the code is only there because I've recently set the base timing.
I was able to hook the car up to a friend's data-logging program last night. At idle, the timing advance is just jumping all over the place, from 9* to 24*. When you drive the car, it evens out and holds steady.
I guess what I'm really asking is if this is all linked to the computer not getting a good signal from the O2 sensor? This seems to also prevent the car from entering closed loop, and again, the problems only arise once the car is up to operating temp. When cold, it runs perfect. I should mention a lot of people thought it might be a vacuum leak or bad coolant temp sensor. I've checked all vacuum hoses and find no leaks. I've gone as far as replacing the intake gaskets and coolant temp sensor, no effects.
Thanks for any advice.
Dave

 

the donor car was it a 350 or a 305? I take it it was a 350 since it's a Z28... if that's the case and you used the computer with calpak or prom, whatever it's called .. ... you would have had to have transferred all of the sensors along since they're calibrated differently.... you have an IAT right? what was the reading on that?

 

The donor car was a 305, and yes, I used all the sensors from that car.
IAT at idle was 126.9*F.
Also, if I'm interpreting my data log correctly, it appears the ECM is getting little to no signal from the O2 sensor at all.
If anyone has TTS Datamaster and wouldn't mind taking a look, I'd be happy to send you the log.

D

 

I am doing the same thing. I just put Hooker Shorties on my 87. I am getting a code 45 for the o2 sensor not getting hot enough with headers. therefor the computer never goes into closes loop and runs rich. The stock single wire sensor uses the exhaust to get the sensor to about 600 degrees. you need a three wire heated sensor that doesn't function off the exhaust temperature.

Here is what I am getting. It is already wired and adapted to fit a single wire setup.
http://www.summitracing.com/parts/CEI-103025/

hope this helps.