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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Sep-05-2010, 10:39:38 PM   #1
Spooks
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Default E46 M3 throttle hesitation when accelerating from a dead stop

For about a month now I have been having issues when accelerating from a dead stop or from a very slow roll. Basically what happens is the car feels like its fuel starved and starts to hesitate. I've read on other forums with similar symptoms, and people have described the motion as "bucking" or "jerking". Don't get it confused with the bucking sensation when you first start to drive an SMG and drive it like an automatic, this is not the case. The bucking motion is not as violent and happens ALL the time. All I know is that its hard to run it against the prick that is trying me at a red light. Once I give it gas, it "hiccups" two or three times until it smooths out and flies. The problem exist in all SMG modes w/ or w/o the DSC. I have also realized that there is a delay in my speedometer. When I start to accelerate, the needle does not move until my rpm's get to around 2000+. I don't know if this has anything to do with it or not.

I have tried cleaning the MAF sensor and throttle body, but still have the same symptoms. My spark plugs and O2 sensors are about a year old. I have a brand new clutch pack and flywheel from a previous rear gasket leak that saturated my clutch pack. I really have no clue to what this can be. Any suggestions?
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Old Sun, Sep-05-2010, 11:22:57 PM   #2
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I had the same thing happen... exactly the same... and it was a small short inside the MAF. New MAF = no more hesitation.
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Old Sun, Sep-05-2010, 11:31:24 PM   #3
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Thanks for the reply! So you had the same symptoms and it was a short in the MAF...hmmm. How was the short diagnosed? The thing is, Im not receiving any codes at all. Could be it though.
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Old Mon, Sep-06-2010, 12:16:50 AM   #4
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check the coils too.
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Old Mon, Sep-06-2010, 12:52:56 AM   #5
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Quote:
Originally Posted by Spooks View Post
Thanks for the reply! So you had the same symptoms and it was a short in the MAF...hmmm. How was the short diagnosed? The thing is, Im not receiving any codes at all. Could be it though.
Well, the dealer was able to pull a code even though there wasn't a CEL (not all codes throw the light). I sorta got lucky, but it did cure the problem.
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Old Mon, Sep-06-2010, 01:59:52 AM   #6
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What are the symptoms of bad coils? I'm starting to think that it might be the fuel pump.
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Old Mon, Sep-06-2010, 02:13:04 AM   #7
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EricSMG, did your speedometer also have a delay?? If your symptoms are exactly the same, then I guess it is a bad MAF sensor.
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Old Wed, Sep-15-2010, 01:10:25 AM   #8
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Haven't had any convincing feedback. Can anyone help me diagnosis my problem??
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Old Fri, Sep-17-2010, 07:45:06 PM   #9
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I'm insterested to hear more on this too. Mine started a couple weeks ago but mine happens a little later when rolling on the throttle. It's most noticable in 5th gear, but can also feel it in 4th when I let off on the gas to coast then push the throttle again. I have a 6MT and no MAF. I suspected the fuel pump and changed that out yesterday, but that didn't fix it. I was monitoring my throttle position via OBD II port and it didn't seem accurate and wondering if it's TPS. To me, it seems more fuel or spark related but not sure. I have 14,000 on the fuel filter and I don't think it's that. I'm at a loss and not getting any codes, I have the Autoenginuity.
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Discussing E46 M3 throttle hesitation when accelerating from a dead stop in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)