Datalog HPFP did it fail?

ididsomething

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Dec 4, 2022
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2008 bmw e90 335xi n54 MT
2008 n54 stage 2+ for a couple of years. It wouldn’t start after work one day. I got a log of it chugging along at wot.
I’m not very skilled at reading these charts if someone could give me their insight. Just looking for confirmation before I replace it or any advice.

 

ididsomething

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Dec 4, 2022
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2008 bmw e90 335xi n54 MT
Had the car 3 years, 2 years on stage 2+ fbo. I have not replaced either the lpfp or hpfp. I just drove it to get a log. It is parked until it’s fixed.
What does it say to you.
 

carabuser

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There's another issue, fuel pressures aren't good, but the fuel trim control is not working. Certainly keep it parked up until you solve it. Try take a log at idle with the Fuel Mode parameter logged.

Do you have any error codes? Anything dodgy installed like a JB4 or DPFix?
 

ididsomething

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Dec 4, 2022
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Here is a log between the failed start and the log I posted above. It was driving better less stumbling than the first posted log.

 

Sgop335

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Sep 29, 2024
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the lpfp gets old and the sock / filter screen clogged which cuts fuel flow. The problem ”could be” as simple as that esp. if it’s not been replaced. if Decided to replace lpfp, better to do w fuel pressure regulator. Error codes as mentioned above?
 

ididsomething

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Dec 4, 2022
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2008 bmw e90 335xi n54 MT
Over the course of a year I was getting two codes before the failed start. 29e0 and 29e1 which is mixture control 1 and 2. After failed start it just shows 29f2.