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this is on my 91 festiva turboed BP.
basic problem:
my festiva is cutting out at high rpms under full throttle.
it has always cut out since ive owned it when the gas gauge reads under half a tank. but now it does it even with a full tank. it seems to get worse the less gas i have. seems to happen sooner in lower gears, but that may be because my rpms are climbing faster.
description of issue:
under full throttle the car accelerates fine, builds boost, then as the rpms climb it will suddenly cut out completely. almost like the car is shut off completely. if i let off the gas slightly it will kick back in but do it again shortly later. if i hold the pedal in, it just continues to die.
it seems to happen mostly between 5k-6k rpms. but when turning right or with less fuel in the tank, it seems to happen sooner.
the wideband is reading around 14.7 while cruising, 17s while decelerating, 13s while accelerating out of boost, 11.2 while in 5psi of boost. i havnt noticed any leaning out richening right before it cuts out.
what ive tried so far:
i changed the fuel filter and it seemed to help a little. i replaced the fuel pump filter as well. (both appeared dirty) but the problem still persists.
it seems to have slowly gotten worse over the past few months. but it almost acts like there is some type of limp mode or boost cut or some electronic cutoff happening under all normal driving situations, the car runs like a champ.
basic problem:
my festiva is cutting out at high rpms under full throttle.
it has always cut out since ive owned it when the gas gauge reads under half a tank. but now it does it even with a full tank. it seems to get worse the less gas i have. seems to happen sooner in lower gears, but that may be because my rpms are climbing faster.
description of issue:
under full throttle the car accelerates fine, builds boost, then as the rpms climb it will suddenly cut out completely. almost like the car is shut off completely. if i let off the gas slightly it will kick back in but do it again shortly later. if i hold the pedal in, it just continues to die.
it seems to happen mostly between 5k-6k rpms. but when turning right or with less fuel in the tank, it seems to happen sooner.
the wideband is reading around 14.7 while cruising, 17s while decelerating, 13s while accelerating out of boost, 11.2 while in 5psi of boost. i havnt noticed any leaning out richening right before it cuts out.
what ive tried so far:
i changed the fuel filter and it seemed to help a little. i replaced the fuel pump filter as well. (both appeared dirty) but the problem still persists.
it seems to have slowly gotten worse over the past few months. but it almost acts like there is some type of limp mode or boost cut or some electronic cutoff happening under all normal driving situations, the car runs like a champ.
), anyhow my gf did a pull with him from like 70mph, i rolled on the gas like half throttle to stay behind and watch. then POP my exhaust backfired and the car jus died completely. 
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