Quote:
Originally Posted by mountainman
There doesn't seem to be a really strong vacuum when I cover the filler opening, but there is a definite difference in the idle when I open the cap.
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That would be normal with any car that uses vacuum to influence various things with the engine.
The computer uses vacuum to gage throttle response, idle etc.
By opening the cap you are breaking the normal vacuum and things will change.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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