garciapiano
Veteran Member
I'm having an issue where the engine hesitates under full throttle (full boost). The turbo will "cycle" and the boost will pull back, almost as if it's bouncing off a limiter. This causes some minor herky-jerkiness in the torque response as the turbo seems to backcycle.
This wasn't an issue before I swapped my turbo for another used OEM turbo. I have a Malone stage 2 tune, but aside from that all the rest of the engine is stock, with the stock turbo.
My guess is that the wastegate actuator may be to blame, or perhaps it may be something else like the N75 or the MAP sensor. I have no codes. The wastegate actuator adjustment has not been touched. It still has the factory paint markings on the actuator shaft.
The car actually went into an overboost limp for the first time ever on a long road trip the other week. I was at a constant 75MPH for about 2-3 hours and I went full throttle to overtake a car, after which the car decided it didn't want to boost anymore. Perhaps due to boost creep.
Limp mode was alarming given I had never experienced it before. I figured that there would be some kind of indication or CEL but apparently there isn't. The car started up and drove normally the next day.
Anyone know what I need to check to fix this?
This wasn't an issue before I swapped my turbo for another used OEM turbo. I have a Malone stage 2 tune, but aside from that all the rest of the engine is stock, with the stock turbo.
My guess is that the wastegate actuator may be to blame, or perhaps it may be something else like the N75 or the MAP sensor. I have no codes. The wastegate actuator adjustment has not been touched. It still has the factory paint markings on the actuator shaft.
The car actually went into an overboost limp for the first time ever on a long road trip the other week. I was at a constant 75MPH for about 2-3 hours and I went full throttle to overtake a car, after which the car decided it didn't want to boost anymore. Perhaps due to boost creep.
Limp mode was alarming given I had never experienced it before. I figured that there would be some kind of indication or CEL but apparently there isn't. The car started up and drove normally the next day.
Anyone know what I need to check to fix this?