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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 11-05-2011, 01:03 PM   #1
Hired Gun
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Join Date: Jun 2008
Location: New York
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My Ride: 2002 M3 Convertible
02 M3 surging and bucking

I did a search, but came up with nothing.

My 2002 M3 6 spd w/50K miles is almost impossible to drive now. Starts fine, idles fine. Go to drive off and it hesitates and bucks. This happens at any speed in any gear. Highway steady speed whether high or low RPM it feels like it surges. If I increase throttle it hesitates and bucks. Never backfires though, just seems to cut out or lose power.

No engine light. I've replaced the plugs and coils with no difference. I replaced the air filter and cleaned the MAF. Techron seemed to help for a bit, but the next day back to the same issue. Next I'm replacing the fuel filter.

I'm not sure what to look at next. Anyone have any ideas?

THANKS!
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Old 11-05-2011, 04:04 PM   #2
cliffbmw
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Sounds like your fuel pump is about to fail. This happened to me but my car had 150,000+ on it. You can try replacing your fuel filter first to see if that helps.
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Old 11-06-2011, 08:17 AM   #3
Hired Gun
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I was thinking a possible fuel pump issue, but with 50K miles it seemed unlikely to me. I thought the other day that the pump seemed a little noisier than I'm used to. In the 90's Chevy/GMC trucks a pump failure was common at any milieage . A noisey pump was the sign that you were soon dropping the tank!

Someone mentioned to me the cam position sensor. I looked at the exhaust one in the same location as it was on my 325i, but it looks different from the pictures I've seen posted here. Can someone confirm it's location?

Thanks again.
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Old 11-06-2011, 09:58 AM   #4
MySoccerM3
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Do you have any warning lights on your dash?
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Old 11-06-2011, 10:55 AM   #5
Hired Gun
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No warning lights at all. I've read that some have had bad cam sensors without tripping the light.

I just replaced my battery (unrelated) and I was hoping that maybe the low voltage of the old battery was causing the car to run funky. No such luck. Exactly the same with the new battery. Maybe I haven't put enough mile on it to trip a code since installing it?
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Old 11-06-2011, 07:27 PM   #6
GM3
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Probably fuel pump, no lights will come on, my freind has an 02 and it was replaced with 15k miles on it. He babys his , i drive hard (03 6spd coupe) with 54k miles and no problems.
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Old 11-07-2011, 01:18 PM   #7
Hired Gun
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Problem solved!! I replaced the fuel filter this morning and the car is super smooth with all the power back. I'm surprised that that HUGE can of a filter was that plugged up w/50K miles. Most cars today don;t even have serviceable fuel filters anymore.

On to the next issue. Thanks for your replies!
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Old 11-07-2011, 01:26 PM   #8
gimmethemuumuu
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Glad to hear you got it resolved!

Before reading the other responses, my first thoughts went to fuel, as well: first, the filter; then, the pump. Turns out, it was a little easier on you, being the filter.

It might not seem like it should clog as early as 50K. However, it all depends on where you, or the PO, filled up. Maybe there's a lot of junk in the tanks there that got into yours
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Old 11-08-2011, 09:49 AM   #9
screamer-beemer531
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Glad it was sorted with only a minor problem but fuel filter problems don't have a set mileage with which they come at. Where do you buy your fuel, as mentioned above, dirty fuel will cause this but you're in New York so I assume that's not the case.
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