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x98boardwell x98boardwell is offline
After the next project
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Join Date: Sep 2006
Location: Central Valley, CA
Posts: 1,522
Another idea

I had the same issue for a while. I replaced the fuel accumulator and it helped alomost everything. I realize you have replaced yours twice so that is probably fine.

My issue continued and I finally found out it was an air-leak. The motor heat soaked after driving and then the little air leak would turn into a large one. The AFR's would be very lean (very hard to start) and as soon as I was able to get some air in the system and it cooled everything down the leak tightened back up and went away, normally after cranking and holding the pedal down to keep it running.

Not a guarantee but worth a shot. You could use a spray bottle filled with very soapy water on the motor before you start after heat soak.. then look for bubbles. Make sure you have good light all over so the visibility is good. It could be around your inter-cooler area, turbo up pipe, by the throttle body or even the injector blocks (which I know are hard to see).

Let us know what happens. With everything that you have already done this is nothing. Best of luck,

Previous cars:
2007 GT3, 2006 Cayenne TTS, 1991 928 S4, 1987 930, 1975 914 2.0, 1989 944 Turbo S, 1991 964 Targa, 1991 964 Convert, 2004 996TT Convertible, 550-6 Spyder with a 2.4 liter twin plug "S-spec'd motor"
Current cars: 2012 Cayenne TT, 1997 993TT, 1984 Jeep Grand Wagoneer, 94' 928 GTS, VW GTI
Old 05-31-2010, 11:19 AM
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