I'm putting a '97 LT1 into a third gen racecar (not street legal, no cats etc).

I'd really like to not to have the CEL on after it's installed. Some guys have it constantly on, so they don't know if there is a 'new' problem. It's a racecar, I'm NOT allowed to tune out the codes, no opening of the computer at all.

I've read of a solution for the VSS (I'm still using the '92 T5, need a 4th gen tailshaft housing etc). O2 sims should work in lace of the rear O2 sensors. If I'm not mistaken, removing the Air Pump will activate the CEL. Is there anything I can do (resistors etc) to fool the ecm into thinking the Air Pump is there and working properly?

 

The air pump will not cause the check engine light to come on.

 

Interesting. I assumed it would based on the answer in this thread.

https://www.camaroz28.com/forums/sho...light=air+pump
I thought it was inferred in the way that was worded that OBDI wouldn't have a CEL but OBDII ('97) would. I know my '02 had a problem with the one way valve and it threw a code.

 

My 95 (obd1) never threw a code. I just put LT's in my buddies 96 (obd2) a few weeks ago and it has yet to throw a code. Idont know why yours would.

 

That is incorrect.

Even if you can fool the computer into thinking it is electrically there (which it will look for), an OBD-II PCM will be looking for evidence of the pump working by monitoring the O2 sensors. If it sees no expected change in a/f ratio when it is supposed to be on, it will throw a code for that. An OBD-I PCM does not do the a/f functional check and all you need is an intact relay and fuse in the circuit to keep the CEL off.

 

Only putting LTs on would not cause a code. There has to be some details you left out.

 

Explain why I took the air pump off my car and my buddies car when doing headers and no code has popped up?

 

You said you put on LTs. You did not even say you removed the pump (details you left out).

It has already been explained. If the relay and fuse are left intact on an OBD-I car, there will be no code.

Your buddy's car should be throwing a code being OBD-II, unless you left out that he has done a swap to OBD-I. Maybe there are some particular conditions with his car to where it has not shown up yet. I bet it eventually will.

 

He did ... You have an OBD1 computer which doesn't always set the CEL. The OBD2 system always does.....

 

do the OBD 1 computers have a setting to turn off the AIR setting to prevent the SES light?

 

The code reporting can be disabled.

 

I own a 97 LT1. The air pump was disconnected (and eventually removed) when the STS turbo was installed. The rest of the engine was totally stock. The air pump would occasionally throw a code until I disabled it in the tune. Actual experience, true story.

 

I have a 97 lt1 and want to unhook the air pump, but dont want to kick a code, and so how would i disable it? or what would i have to do?

 

Have the PCM tuned to eliminate the code/SES light.

 

What kind of racing/class are you in that allows you to put an LT1 into a 3th Gen. but wouldn't let you "touch" the computor? And how would they know?