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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Car Bucking

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      08-26-2011, 09:41 AM   #1
boosted TreTre
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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
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Did they replace the fuel filter?
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      08-27-2011, 09:16 AM   #3
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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
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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.

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