Car stuttering when accelerating in high gear from low RPM

GeorgiaTech335coupe · 01-28-2011, 11:21 AM

Misfires in high gear at low rpm plagued me for a while. It eventually got worse and worse, moving down the gear tree. Use to only do it in 6th, then 5th and 6th and so on till it would do it in all gear 2nd and up. Ended up replacing injectors 1-3. This was after I already had injectors 1-6 replaced about a year ago. Problem is fixed now.

Trojan4evr · 01-28-2011, 11:26 AM

It could also be VANOS or CAM sensor.

Leo985i · 01-28-2011, 12:26 PM

Quote:

Originally Posted by Jed

I had the exact same issue with mine (all stock). ~1.5K rpms in 6th gear and it stuttered. Brought it to the dealer, they checked the LPFP, spark plugs and injectors. In the end, it was severe carbon buildup-the valves at cylinder 2 were sticking. After a thorough cleaning, zero issues.

Car feels like brand new and stronger.

In your case, you may want to have your dealer take a look into that if you've done everything else.

My car had/has??? the same issue for months. It's been at the dealer for awhile now, they replaced the HPFP with the latest one, Low pressure fuel sensor, spark plugs, replaced coils and it was still doing it apperently. So, like 4 days ago they told me they would open it up and look for carbon build up, before replacing all the injectors for a 2nd time (had them replaced (9k miles ago), with the latest ones. Mine was shuttering pretty much in every gear from 2nd to 6th 2k-4k rpms. Hopefully I'll get it today or early next week.

Ensi · 01-29-2011, 10:29 PM

Had the same issues, Seafoam'd it and it's now gone.....

dcorn · 03-30-2011, 09:30 AM

Maybe I need to try seafoam. My car has been doing this for a while. When I accelerate hard through the gears, it doesn't do it, but when I'm in 4th or 5th and hit the throttle, it stutters badly. Of course my warranty just ran out and injectors were never even mentioned to be replaced for this issue...

AWD Addict · 03-31-2011, 12:23 AM

1500 rpms in 6th?

I find 6th sluggish at 90mph.

01-28-2011, 11:21 AM	#23
GeorgiaTech335coupe Lieutenant Colonel 81 Rep 1,883 Posts Drives: Black BMW 335i coupe Join Date: Mar 2007 Location: USA iTrader: (0)	Misfires in high gear at low rpm plagued me for a while. It eventually got worse and worse, moving down the gear tree. Use to only do it in 6th, then 5th and 6th and so on till it would do it in all gear 2nd and up. Ended up replacing injectors 1-3. This was after I already had injectors 1-6 replaced about a year ago. Problem is fixed now. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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01-28-2011, 11:26 AM	#24
Trojan4evr Lieutenant Colonel 521 Rep 1,927 Posts Drives: 2021 G80 M3 Join Date: Oct 2009 Location: Socal iTrader: (0) Garage List 2011 BMW/ E82 135i [1.00] 2007 BMW/ E90 335i [5.50]	It could also be VANOS or CAM sensor.
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01-29-2011, 10:29 PM	#26
Ensi Private First Class 8 Rep 145 Posts Drives: 10' 335D Join Date: Aug 2010 Location: Pac NW iTrader: (1)	Had the same issues, Seafoam'd it and it's now gone.....
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03-30-2011, 09:30 AM	#27
dcorn Captain 90 Rep 952 Posts Drives: 2008 E90 335i Join Date: Dec 2009 Location: NoVA iTrader: (2)	Maybe I need to try seafoam. My car has been doing this for a while. When I accelerate hard through the gears, it doesn't do it, but when I'm in 4th or 5th and hit the throttle, it stutters badly. Of course my warranty just ran out and injectors were never even mentioned to be replaced for this issue...
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03-31-2011, 12:23 AM	#28
AWD Addict Chief Executive 394 Rep 2,920 Posts Drives: 2008 335xi 6spd Coupe Join Date: Dec 2007 Location: Boston iTrader: (1) Garage List 2008 335xi [0.00]	1500 rpms in 6th? I find 6th sluggish at 90mph.
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