[inphinion]

Originally Posted by jaybur_racing

1992 lumina Euro 3.1
My car runs decent at up to 3/4 throttle, if you smash the gas pedal down, it loses power and slows down, let it back to 3/4 throttle and it picks up speed again. if I keep it at 3/4 throttle in second gear it will continue to pull up to high rpms, so I am kinda ruling out the fuel pump, or filter. I have 38 PSI fuel pressure. I cleaned the IAC valve which cured my idle issue, and did the re-learn procedure, it will idle fine, no probs when stopping. ANYONE have a guess or similar experience? I know these cars have injector probs, but it wouldnt make sense that only at full throttle it dies out. I am going to do the ohms test on the injectors later on to rule those out, but just looking for some advice in advance! thanks

Hi, did you find what was causing this problem?

I am having the same problem with 1998 Lumina 3.1. I replaced cat converter, changed fuel filter but still have the same problem.


The problem occurs only after the car is warmed up. In the morning, the car runs fine for approximately 10-15 minutes but then develops the same problem - it just does not have any power if I press the gas pedal beyond the halfway.


If I keep the car in the first or second gear while pressing the gas halfway, the car would slowly accelerate to high RPM so the fuel pump seems to be fine.

The car does not show any codes.