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      12-11-2012, 03:02 PM   #28

Dackelone's Avatar
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

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Originally Posted by M130ISWP View Post
The exhaust place said it might be the fuel pump causing the flat spot.

That is actually a good idea. It could be the fuel pump. It could be mechanical issue with the pump, or even a voltage fluctuation issue at the pump. Or a ground issue at the pump.

Do you have access to an OBD-II code reader. Maybe you could read the fuel pressure while on the fly. Or install a mechanical fuel pressure gauge(temporarily) and drive WOT and see what it read at your flat spot. You will probably need a helper.