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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > N54 - surging and rough start up



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      12-20-2018, 04:54 AM   #1
BMW335iSport
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N54 - surging and rough start up

Current symptoms;
  • Rough start up on cold, sounds like the engine is struggling, it's not roaring to life instantly.
  • Today it didn't start up on first attempt, second attempt it worked.
  • I'm getting surging on light throttle only, WOT feels perfect and the logs look good whilst WOT.

State of the car;
  • Spark plugs roughly a year old.
  • Coils are a couple months old.
  • Turbos less than a year old.
  • No codes according to JB4 Connect.
  • Hitting decent boost according to JB4.


Any ideas that I can try before spending silly money on injectors?
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      12-20-2018, 06:04 AM   #2
Dann
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Try the fuel pressure sensors and possibly HPFP.

Have you had it walnut blasted?
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      12-21-2018, 04:57 PM   #3
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Sounds like the hpfp
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