Posted on Jan 10, 2009

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During slow, steady acceleration, car feels like it is hesitating

Hi! I have an '04 545i 6spd with 38k miles. Love the car! I have, however, noticed a "hesitation" during light acceleration. The best way I can describe the feeling is it is like driving a car that is not completely warmed up....very slight but noticable to me, of course. I have brought it to the dealer, but the "technicians" that are "experts" cant and wont guess since their computer doesn't show any messages. (side note...are there any mechanics left?) I changed the air filter, have tried different brand fuels. Any ideas? Thanks in advance, Rich

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okidokee Jan 10, 2009

Thanks, Smithbrother! So how do I convince BMW to replace or inspect for vacuum leaks? The car is still under warranty. Actually, I would happily pay to even get it fixed! Along with the TBFI gasket, any other specific things I should have them check? Thanks again for the quick response!
bban1998 Jan 18, 2009

I have the same problem on my 05 545i an the BMW mechanics at Momentum BMW still cannot figure it out. They have told me that there is a rich A/F misture but have not been able to pin point the elak. They have charged me for cleaning out the fuel and replacing the injectors but to no avail. At this time I am really frustrated that even though my car is under warranty they are not able to pinpoint the issue. If you have some clue please let me know via this thread.

thanks in advance.........
Thomas F. Schneider May 11, 2010

A vacuum leak would cause the air fuel mixture to be lean and cause a hesitation. I had a bad TBFI gasket go once and had that problem. Thin fuel ratio will not set a code

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Thomas F. Schneider

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Posted on Jan 10, 2009

Thomas F. Schneider

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That was just a generic answer I do not know your particular car. Back in the day we put oil around the intake gaskets and if the engine speed increased or steaded we knew that we had found it. I also could be other things. Have you tried Carb/injector cleaner in with the gasoline? A vacuum leak could be too small to show on a vacuum gage but a person could look for or at least confirm a leak with the gage. Sorry I can not be of more help.

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