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      12-19-2010, 06:10 PM   #57
hwelvaar
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Drives: BMW M135i MT
Join Date: Jan 2008
Location: Belgium

Posts: 1,071
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I've had the HPFP replaced twice in 4 years time (120.000 KM)

I've read on the net that the 'software upgrade' for the N54 problem is more like a down-tune of the max performance delivered/requested from the pump.

It fixed my startup problems for a few months, but eventually the pump had to be replaced anyway.

Also, I've had like 20 engine limp conditions in the past 4 years. Dealer never really clarified why, but I suspect related to HPFP.

I drive european 335i, on 98 RON premium gas, so type of gas has nothing to do with HPFP problem.
hwelvaar is offline   Belgium
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