'Jerky'/'stuttering' acceleration problem

Slidewayz · 04-17-2009, 02:50 PM

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.

Slidewayz · 04-17-2009, 04:28 PM

Dang! Did I not

properly or is this unusual?

Dan335i · 04-17-2009, 05:20 PM

Could be a few different things.Fuel and electrical problems usually feel the same,take it in and get it checked out.G/L.

TMR · 04-17-2009, 05:35 PM

what tune are you using?

Slidewayz · 04-17-2009, 07:26 PM

Quote:

Originally Posted by TMR

what tune are you using?

Vishnu Canbus, DCI, & catless DPs.

gt3fever · 04-17-2009, 08:02 PM

Quote:

Originally Posted by Slidewayz

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??

Slidewayz · 04-17-2009, 08:34 PM

I dunno, I hope my car isn't developing Parkinson's.

OpenFlash · 04-17-2009, 08:45 PM

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

Slidewayz · 04-17-2009, 09:41 PM

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

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

04-17-2009, 02:50 PM	#1
Slidewayz Major 33 Rep 1,177 Posts Drives: 2007 335i Join Date: Jan 2009 Location: Oakland, CA iTrader: (5)	'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 05:15 PM..
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04-17-2009, 04:28 PM	#2
Slidewayz Major 33 Rep 1,177 Posts Drives: 2007 335i Join Date: Jan 2009 Location: Oakland, CA iTrader: (5)	Dang! Did I not properly or is this unusual?
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04-17-2009, 05:20 PM	#3
Dan335i Lieutenant Colonel 32 Rep 1,786 Posts Drives: 07 335i coupe 6MT,w/sp. pack. Join Date: Oct 2007 Location: orange county NY iTrader: (2)	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, 05:35 PM	#4
TMR Brigadier General 394 Rep 3,161 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	what tune are you using?
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04-17-2009, 08:34 PM	#7
Slidewayz Major 33 Rep 1,177 Posts Drives: 2007 335i Join Date: Jan 2009 Location: Oakland, CA iTrader: (5)	I dunno, I hope my car isn't developing Parkinson's.
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04-17-2009, 08:45 PM	#8
OpenFlash 1737 Rep 17,960 Posts Drives: A Lot Join Date: Sep 2006 Location: SF Bay, CA iTrader: (0) Garage List 2018 Ducati Panigal ... [0.00] 2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00]	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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