BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      03-29-2012, 02:38 PM   #1
AW128i
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N51 pulsing under light to medium acceleration??

Recently, and intermittently, under light to moderate acceleration the engine seems to be pulsing. I can't think of any other way to describe the behavior other than pulsing. It's like I'm pressing on and backing off the accelerator slightly, but I'm not. It's certainly not bad, but it's a relatively new behavior and I can't help but think it's indicative of something bigger. Anyone experience this before? At this point, since it's intermittent and not glaringly obvious when it occurs I know my dealer will just give me the "could not replicate" line.
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      03-29-2012, 07:42 PM   #2
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Mine has done that since new. Mostly when it is cold and within the first few miles. Of course the dealer says that the behavior is normal.
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      03-29-2012, 08:06 PM   #3
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This happens on a warm engine, even sometimes after driving over 20 miles.
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      03-29-2012, 08:18 PM   #4
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i forgot.. is your car mt or at....

change gas stations / brand recently, maybe just a bad tank.

if auto, reset the transmission.

give it a try
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      03-29-2012, 08:25 PM   #5
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My car is auto. I tend to get gas at a couple different stations, being that I generally do about 3 tanks a week. This strange problem has been present for a few weeks, or at least I've just noticed it in the last few weeks.
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      04-05-2012, 11:55 AM   #6
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Quote:
Originally Posted by AW128i View Post
My car is auto. I tend to get gas at a couple different stations, being that I generally do about 3 tanks a week. This strange problem has been present for a few weeks, or at least I've just noticed it in the last few weeks.
ANY LUCK ??

did it change / go away ??
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      04-05-2012, 07:22 PM   #7
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No change, not any worse, nor any better. It's also intermittent, so I'll just keep an eye on it and see what happens.
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      04-07-2012, 06:25 PM   #8
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This also happens (very sporadically) with my '06 130i... Kinda sounds like when the exhaust flap opens and closes (but it can't be the flap because I've done the golf tee mod). Doesn't seem to affect performance, and it's so slight, only I can detect it, not anybody else in the car with me. Strange.
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      06-24-2012, 02:25 AM   #9
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Mine does this too sometimes. Check my post in the NA engine forum.
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