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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 335i misfires, or HPFP? no CEL



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      05-28-2017, 05:03 PM   #1
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335i misfires, or HPFP? no CEL

Is it common to get any misfires, or have HPFP issues without getting a CEL.

Often on cold start, and sometimes under heavy acceleration i get a skipping like hesitation. The it does not race up like a slipping auto, so I think its maybe plugs, or HPFP. There is no check engine light. Car is a 335i 2010 with 54,000 miles on it.

What should I try/check first?
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      05-28-2017, 08:14 PM   #2
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Pull your shadow codes first, then log HPFP Pressure under load in a 3rd gear and 4th gear pull.
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      05-28-2017, 11:54 PM   #3
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Quote:
Originally Posted by dyezak View Post
Pull your shadow codes first, then log HPFP Pressure under load in a 3rd gear and 4th gear pull.
Will a regular OBD2 scanner pull the shadow codes? I dont have any logging options yet, Was looking to get that setup soon but still researching on how to pull the logs.
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      05-29-2017, 01:56 PM   #4
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well i checked with my OBD2 scanner, no pending codes listed since last time it was cleared.
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      05-29-2017, 02:30 PM   #5
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Pull your plugs cold in the morning, if smelling of gas, bad injector, are you covered under warranty? A electric misfire should come up by code if present.,
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      06-02-2017, 09:49 AM   #6
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Misfires can occur without throwing codes and normally do not cause a CEL.

The MSD81 DME has misfire counters which can be monitored in real-time.
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      06-05-2017, 01:53 AM   #7
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Sounds similar to issues that I'm having. With a tune I was misfiring badly under heavy load and my logs showed that my car was running way too lean. I finally threw a hpfp code but it seems my cold starts are much worse than yours as well. Your hpfp may be on its way out.
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      06-05-2017, 03:37 AM   #8
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HPFP going out.
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      08-13-2017, 12:46 AM   #9
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this can be closed, ended up being the plugs... swapped them out after finding a socket that fit, and no more issues for over a month now.
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