Running rich?
Thread Starter
Cruising
Joined: Feb 2010
Posts: 11
Likes: 0
From: OCALA FLORIDA
Running rich?
Have a 92 lt-1 and when it fires up, runs perfect for a few minutes then when it starts to warm up it will run rich, miss and seem to have no power at idle. When i rev it up runs ok at high rpm. Both o2 sensors are good and it doesnt pull any codes. Please dont tell me the opti. I have had a delteq ignition sysyem on it for 2 years and have had no problems, just installed this motor and trans from another car. Ran fine then, was hoping maybe a sensor somewhere, just replaced the coolant temp sensor on the front of engine,(broke the old one on engine install). Seemed to help a little but something else is wrong. Anyone?
Racer
Joined: Oct 2008
Posts: 299
Likes: 1
From: Ottawa Ontario
How do you know the O2 sensors are good? That sounds exactly like a bad O2 sensor since they're out of the loop for the first few minutes while the car warms up.
I had a similar issue a little while back. It ran fine at cold starts, then ran rough after it warmed up. No codes either. I hooked up my laptop and watched the O2 sensors while the car was running and could see the driver's side reporting low/whacked out numbers. I replaced that O2 even though it was only 2 years old at the time and that rectified the issue.
Good luck with trying to diagnose your issue. Let us know how it turns out.
I had a similar issue a little while back. It ran fine at cold starts, then ran rough after it warmed up. No codes either. I hooked up my laptop and watched the O2 sensors while the car was running and could see the driver's side reporting low/whacked out numbers. I replaced that O2 even though it was only 2 years old at the time and that rectified the issue.
Good luck with trying to diagnose your issue. Let us know how it turns out.
