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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 12-01-2007, 10:20 AM   #1 (permalink)
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'04 330Ci Pulsing Acceleration

My '04 330ci is giving a pulsing response to acceleration when I try to run it hard...sometimes. Tried new gas. Found that turning off the DSC helps, but not sure if that's the culprit. Has anyone else had this happen?
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Old 12-11-2007, 11:56 AM   #2 (permalink)
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2003 330i ZHP

I have the same problem after around 3000 rpm. I talked to service and they said that a few of these cars have the same problem. I put some fuel injector cleaner in the tank every once in a while and it seems to help a bit as well. They don't think that there is any significant repair that can fix it.
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Old 01-17-2008, 11:05 AM   #3 (permalink)
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I picked up my '04 330ci in December and on the drive home from Chicago I also noticed the surging under power. When I got home I filled the gas tank and added two bottles of Chevron Techron fuel injector cleaner. This cleaner was recommended by name in the owner's manual for my '94 325si. I used two bottles as the fuel tank size was in excess of the gallons treated listed on the label.

Haven't driven much since then, but last week I ran it up a little and it began missing on one cylinder badly and the check engine light came on. As I was only a couple of blocks from home I kept going. Restarting the car a few minutes later found all to be well and I have had no problems since. Surging has not returned.

I'm pretty sure it was just gummed up injector nozzles and the cleaner loosened a lump and stopped it up as it went through.
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Old 01-17-2008, 07:46 PM   #4 (permalink)
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[quote=perkscar]My '04 330ci is giving a pulsing response to acceleration when I try to run it hard...sometimes. Tried new gas. Found that turning off the DSC helps, but not sure if that's the culprit. Has anyone else had this happen?[/quot

You can restore your car performance,using"terraclean",a product which many BMW dealerships offers in western Canada.Link below$140.00 treatment)
TerraClean™
enjoy !
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Old 01-17-2008, 10:25 PM   #5 (permalink)
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Didn't read any previous posts, but it could be a misfire in the cylinder. Try replacing the sparkplugs. if that doesn't work try ignition coils. or wait for the check engine light to come on and run codes. good luck
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