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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 > 'Jerky'/'stuttering' acceleration problem



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      04-17-2009, 03:50 PM   #1
Slidewayz
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Unhappy 'Jerky'/'stuttering' acceleration problem

I am feeling some 'jerkiness' or 'stuttering' under hard acceleration in higher gears.

Could this be the dreaded HPFP failure? The last time I felt a car do this, it was bad coils.

I'm not getting a CEL or SES light.

Last edited by Slidewayz; 04-17-2009 at 06:15 PM.
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      04-17-2009, 05:28 PM   #2
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Dang! Did I not properly or is this unusual?
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      04-17-2009, 06:20 PM   #3
Dan335i
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Could be a few different things.Fuel and electrical problems usually feel the same,take it in and get it checked out.G/L.
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      04-17-2009, 06:35 PM   #4
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what tune are you using?
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      04-17-2009, 08:26 PM   #5
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Quote:
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what tune are you using?
Vishnu Canbus, DCI, & catless DPs.
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      04-17-2009, 09:02 PM   #6
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Quote:
Originally Posted by Slidewayz View Post
I am feeling some 'jerkiness' or 'stuttering' under hard acceleration in higher gears.

Could this be the dreaded HPFP failure? The last time I felt a car do this, it was bad coils.

I'm not getting a CEL or SES light.
i have experienced same problem lately with Canbus, DCI and catless dp.

I wonder if the problem comes from canbus map??
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      04-17-2009, 09:34 PM   #7
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I dunno, I hope my car isn't developing Parkinson's.
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      04-17-2009, 09:45 PM   #8
shiv@vishnu
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It's getting warmer guys. If you are getting hesitation under full boost, it's likely knock retard. If that is the case, be sure to run a good quality fuel. That means either Shell or 76 here in CA. If that doesn't help, drop your user torque by 5%.

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      04-17-2009, 10:41 PM   #9
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I was wondering if it was the knock nannies. 76 versus Chevron, then?

I guess I can try a gallon of race gas...

Do you still do dyno tunes here in the Bay? Do you think that might smooth things out?


Quote:
Originally Posted by shiv@vishnu View Post
It's getting warmer guys. If you are getting hesitation under full boost, it's likely knock retard. If that is the case, be sure to run a good quality fuel. That means either Shell or 76 here in CA. If that doesn't help, drop your user torque by 5%.

Shiv
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