Quote:
Originally Posted by 4g63tcrazy
This is on my white one. 91 tsi, auto, stock. I can't do a boost leak test til I come back home to MN which is in 2 weeks. The car does run lean at idle. I'm pretty sure I need a new fuel filter cause at light loads (driving up a hill) I'll feel a big loss of power and the wide band goes to about 17.5 a/f. Or I was thinking it's the fpr. But that is a different problem. I can't really do anything til I boost leak test it otherwise I'll just be going in circles. And I don't know if base timing is set correctly but the car idled fine before, except it idle surged as it warmed up. But once it was warm it was absolutly perfect. Now that I blocked off the FIAV it does the opposite..
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Check your base timing. If the ICS was stuck open it could have been letting in enough air to overcome the fact that the base timing is way off. Now that you've closed up that leak the car does not have enough air to run (If I am reading your problem correctly the car will start then die?) Another problem could be a very large vacuum leak.
The fuel filter can cause a blockage in fuel flow overall. A fpr failure would be a lack of fuel under load. If the vacuum line isn't hooked up to the FPR you will not have a rising rate of fuel pressure delivery under boost.
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