Closed loop trims go -35 help
08-27-2018, 06:18 PM
#1
10 Second Club
Thread Starter
Closed loop trims go -35 help ive tuned the ve within 5 percent on all cells the car will show normal fuel trims on start up but with 150 feet they start climbing into the 30s. While driving heavy throttle brings them down but any low loads shows -35 even at idle after driving. You can turn the car off and back to normal. Only after driving they do this. It’s a 99 trans am M6 .228r 5.3 heads fast 36s. Injector data is correct. What would cause this.
08-27-2018, 07:06 PM
#2
TECH Senior Member
What shape are the O2's in? Sounds like the warmer they get, the worse the trims get...
08-27-2018, 08:09 PM
#3
10 Second Club
Thread Starter
They were in the car when he brought it to me. I put a cam in the car a while back and he brought it back for heads and speed density. I didn't have this problem with just the cam. If I'm not mistaken its the vette 02s. Now at idle trims are good. Any throttle up they jump to 20 percent on both banks. Sometimes one will go about 5 percent higher than the other. Its really the only thing I can see that can be wrong but why would both sensors fluctate the same. If one shoots 15 percent with a slight blip idling the other will go 13. Driving is in the negative 30s the car will misfire and barely run. I had to put it in open loop to get it home a few minutes ago. I went back over my VE table as well. Not a single cell higher than 3 percent.
