Originally Posted by Injuneer (Post 6976950)

Does is have any codes for the O2 sensors?

Might want to add the year of the engine/PCM, since all LT1's are not the same.

Originally Posted by 94Z28LS1toLT1 (Post 6976955)

94 Fred on both,and my buddy and I did a scan on it n his fuel trims were higher than mine,I believe they were 118 119 his are 128 129

Originally Posted by 94Z28LS1toLT1 (Post 6977054)

Code 41 was there but got cleared on scanner,light isn't currently on,on cold temperatures car isn't giving me problems,after warmed up it's jerking,popping n feels like it doesn't wanna go

Originally Posted by Injuneer (Post 6977141)

Heat soak can affect the ICM, the optical cam position sensor in the Opti and the fuel pump. Faulty O2 sensor can cause problems when the PCM goes into closed loop, and uses feedback from the O2 sensors to control the A/F ratio.



Long term fuel corrections (which is what you want to look at) or short term fuel corrections? In which cell - there are 18 different cells, based on engine load and engine RPM, that the PCM uses to control the A/F ratio. If yours are long term, the engine is either in a true rich condition and the PCM is pulling 7% of the fuel out to correct the rich condition, or you have a "false" rich condition, and the PCM is pulling out fuel is shouldn't be pulling out.

But two data points without reference to a cell are not really useful. Time for Scan9495.

Originally Posted by Injuneer (Post 6978223)

What brand Opti did he install? The cheap ones are trash, often defective right out of the box.

Originally Posted by Injuneer (Post 6978248)

Post the data log to an FTP site, or e-mail it to me so I can take a look at it.

Are you sure the floor mat wasn't stuck under the accel pedal? Take the air intake elbow off, and see if the throttle blades are actually opening all the way.