Car Bucking

boosted TreTre · 08-26-2011, 09:41 AM

Hey I need some help since bmw dealers cant seem to fix my car. Around 3k rpm from 4th, 5th, and 6th gear if I accelerate hard my car starts to buck. Injectors have been replaced, fuel pump has been replaced and this still happens. Please let me know if anyone has this problem and know what could be causing this?

Glim · 08-26-2011, 10:44 AM

Did they replace the fuel filter?

Abdi · 08-27-2011, 09:16 AM

I would also replace the spark plugs. This is commonly over looked and worth the expense.

tahoerdr · 08-30-2011, 03:50 AM

I'm having a very similar issue from the sounds of it. Starts and idles fine, but at about 3psi boost it misfires bad on all cylinders. Catless DP's installed 2 weeks back, I think it's related to O2 sensors damaged or not properly adapted. Strange thing is it ran fine for 2 weeks, car stored for a week, then issue pops up.

http://www.e90post.com/forums/showth...t=injector+diy

08-26-2011, 09:41 AM	#1
boosted TreTre Catch Me If You Can 8 Rep 80 Posts Drives: e92 Join Date: Apr 2010 Location: dirty iTrader: (0)	Car Bucking Hey I need some help since bmw dealers cant seem to fix my car. Around 3k rpm from 4th, 5th, and 6th gear if I accelerate hard my car starts to buck. Injectors have been replaced, fuel pump has been replaced and this still happens. Please let me know if anyone has this problem and know what could be causing this?
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08-26-2011, 10:44 AM	#2
Glim Captain 21 Rep 780 Posts Drives: 2006 330i & 2013 X5 35i Join Date: Jun 2011 Location: Victoria, BC iTrader: (0)	Did they replace the fuel filter?
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08-27-2011, 09:16 AM	#3
Abdi New Member 0 Rep 8 Posts Drives: 2006 330i Join Date: Oct 2009 Location: MA iTrader: (0) Garage List 2002 VW Jetta 1.9 TDI [0.00] 2007 VW Touareg 4.2 [0.00]	I would also replace the spark plugs. This is commonly over looked and worth the expense.
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08-30-2011, 03:50 AM	#4
tahoerdr Private First Class 7 Rep 102 Posts Drives: E92 335xi Join Date: Apr 2008 Location: Bay Area, CA iTrader: (3)	I'm having a very similar issue from the sounds of it. Starts and idles fine, but at about 3psi boost it misfires bad on all cylinders. Catless DP's installed 2 weeks back, I think it's related to O2 sensors damaged or not properly adapted. Strange thing is it ran fine for 2 weeks, car stored for a week, then issue pops up. http://www.e90post.com/forums/showth...t=injector+diy
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