Engine Rpms Falter Under Hard Acceleration - BMW Forum

andrewgrhogg · 07-25-2005, 05:03 PM

1996 328ic (convt) with 100k. Now i know the BMW engine, like most euro engines, is a peaky SOB. But this is someting different. The engine pulls well, and gradually harder as i accelerate. Then suddenly at about 4200 rpm or so it falters, almost like you took your foot off the gas, or someone cut off the fuel supply just for a nanosecond. Then it picks up where it left off, then it does it once more at 5200 or so then picks up again up till redline. Very repeatable, and typicall happens most noticeably in second gear or third gear - i think it's just more noticable int hose gears.

Any ideas on what might be going on here?

andrewgrhogg · 07-28-2005, 03:25 PM

So you all trying to tell me that no one else sees this problem? And that no one on the board at least has an opinion as to what might be the cause?

Justin318is · 07-28-2005, 03:48 PM

guess not take it in then and have it looked at if it is bothering you that much

93 325i · 07-28-2005, 03:55 PM

change fuel filter, spark plugs, air filter.. these can cause those symptoms. Even a dirty fuel pump possibly. THere are flat spots on the pwerband as well. This just may be the case as well.

Justin318is · 07-28-2005, 03:59 PM

how much would it cost for new fuel filter, spark plugs, air filter and fuel pump

nobrakese36 · 07-28-2005, 06:49 PM

Quote:

Originally posted by Justin318is@Jul 28 2005, 12:59 PM
how much would it cost for new fuel filter, spark plugs, air filter and fuel pump

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the fuel pump is expensive, but the rest should run ya about 55.00$

andrewgrhogg · 07-28-2005, 08:43 PM

Cool - thanks for the suggestions. Will try the filter route first and then if that does not fix it i will look into the fuel pump.

shanneba · 07-28-2005, 09:24 PM

In addition to the spark plugs and fuel filter mentioned earlier, you may want to check the oxygen sensor(s) since you are at 100,000 miles.

The current models call for replacement of the plugs and oxygen sensors at 100,000 miles. The older models proabably have a shorter replacement interval.

loftygoals · 07-29-2005, 10:52 AM

Quote:

Originally posted by andrewgrhogg@Jul 28 2005, 03:25 PM
So you all trying to tell me that no one else sees this problem? And that no one on the board at least has an opinion as to what might be the cause?

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I have this same problem on my 325i. I only see it happen at the 4200 mark. Let me know if you get the issue resolved.

-bj