[bf15]

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?

[dyezak]

Pull your shadow codes first, then log HPFP Pressure under load in a 3rd gear and 4th gear pull.

[bf15]

Originally Posted by dyezak

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.

[bf15]

well i checked with my OBD2 scanner, no pending codes listed since last time it was cleared.

[JuniorB]

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.,

[808AWD325xi]

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.

[Nfifty4]

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.

[Jpfabrications]

HPFP going out.

[bf15]

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.