I bought a 97 Trans Am LT1 6 speed about a week ago. It was a Sc car, so it has pacesetter longtubes into a rando unidentified catback. There are no o2 sensors.. Not one... So my question is this.. Why? How? And what can I do about it? I can see the places for the upstream o2 sensors, but they're plugged. I'm pretty sure the egr is gone. Stored codes show a code for all 4 sensors. It's running really rich, and it backfires when I let off the gas.

 

Send your ECM to Solomon and he will tune all of that out...

LT1 PCM Tuning - Welcome!

Good luck and kill Rustanks!!


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Can't tune out the front O2 sensors, unless you convert to speed density mode. Put the front O2s back in, and the car won't run so rich. As it stands now it is running in open loop which is purposely set rich. The rear O2's will set a code but it should not affect anything, and the rear O2.s can be tuned out

 

is the wiring still there, if so do like pete says and see what happens. could be all it needs. any stickers on the pcm from a tuner?

 

Thanks for the replies guys. The wiring for the front o2 sensors is there. I guess I'll go ahead and put some on the car. Had a little problem earlier, parked the car and she gushed coolant all over the ground.. Like a gallon. I'm hoping that it's just the water pump and not a crack in the block or something. From what I've read, I'll have to replace the opti now.

No stickers anywhere indicating a tune craby. My luck. lol

 

Depends where the gusher came from and ran to. Was the engine running too hot? Your radiator cap could have had a seizure and burped the coolant out.

 

Car was running where it normally is as far as temp. It was backfiring so bad before I parked. I opened the hood and saw a stream of coolant on the front of the engine, somewhere around the middle. I'll know for sure tomorrow.

 

sounds like a hose popped off or failed. im sure the coolant was not helping.

 

Thanks Craby, ended up just being one of my hose clamps failing. I know a good bit of water got on the opti. Hopefully it'll be alright.

I put some o2 sensors before where the cats would be, and it seems to run a lot better after the car warms up. There still seems to be a small miss. I don't know if it's because the opti is going, or because it's time for plugs and wires.

When looking at the engine from the front of the car, there's a hose that goes into the left valve cover that isn't plugged in, anyone know what this is?

The people before me removed the egr, and idk where the air is, but im pretty sure they removed that. Anyone know of a writeup so that I can make sure it's done right?

 

That hose is where the crankcase breather tube. That hose should go to the throttle body.


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