Help Boost Problem

[yhype]

I am having a problem with the boost...when i get on the throttle and the boost gets around 7 psi the jerks as if i got off the gas slightly, but the boost psi keeps going up until it tops off. I have unplugged the TPS and test drove it and there was no change in how it acted except with the engine light on. Please help...

 

[Run-GSX]

Thats got nothing to do with the TPS.

Seems like your wastegate actuator might be bad , If the boost is just going all the way up.

 

[yhype]

Is there anyway of testing this idea to make sure this is the problem?

 

[Run-GSX]

First check all the vacuum(pressure) lines going to the wastegate actuator and make sure they are all intact.
Next , you'll need a vacuum-pressure gun.....you can get one at a auto-parts store for about $40. Its a great investment for using on other things too, like EGR valves.
If the wastegate-actuator doesn't hold pressure or vacuum then its bad.
You must only use light vacuum to test it , though. less than 15 psi or you may rupture the diaphram inside.

 

[yhype]

Could this also me a simptom of boost creep? Or might it have to do with my BOV going into the atmosphere becuase it does run REALLY rich when i get on the throttle. thanks

 

[talon400tsi]

Fiirst what mods do you have done ? I had the some problem after putting new intercooler pipes on . My car runs real rich especially at WOT . I have two fuel pumps one intank and the other is inline so I have enough fuel the a/f gauge is pegged at WOT and voltage on O2 sensor is on the rich side . I could not find the problem at first , I was only running 16psi. So I started by turnning the boost down I got it down to 7-8 PSI and it stopped . It was fuel cut!!! By incressing the air flow with the New Intercooler pipes the ECU was causing fuel . I ended up making a Fuel Cut Defender , It cost about five dollars . I now have it tuned to 21PSI before it hits fuel cut . I usually run 16-18 PSI . So depending on your mods this may solve the problem you are having.