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Old 05-01-2013, 06:36 AM   #1
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Join Date: Oct 2011
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My Ride: E46 318i SE saloon
E46 318i SE 2001 - Jerky acceleration when cold


I was wondering if anyone has any suggestions to my problem here.

Recently someone decided to come off the road and crash into my vehicle whilst it was parked on my driveway. As the accident was not my fault, the garage I used offered a free engine service if I used their claims management company.

Now when I took my vehicle in to the garage mechanically it was fine, no problems. When I got it back a problem developed (i'll explain shortly), so I took it back and surely enough the garage have fobbed me off with "we haven't done anything wrong, it was a pre-existing problem", now I personally don't remember my vehicle struggling to even move prior to taking it, I feel that this is something I would have noticed, so I'm locked in a battle of my word against theirs.

The problem itself - When I have just turned on the engine and it is cold seems to be the only time this occurs. The acceleration is really slow and jerky (I can feel myself being thrown backwards and forwards slightly), and the vehicle will really struggle to reach 50mph. After approximately 3-4 minutes of driving the problem seems to disappear and everything is back to normal.

Now I could just carry on driving and ignore this as the problem only lasts a couple of minutes but I don't want this to develop into something more severe, could this be something to do with the service they performed or could it be purely coincidental that the problem only occurred the moment I had my car returned?
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Old 05-01-2013, 06:46 AM   #2
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Vanos seals maybe

Last edited by orb; 05-01-2013 at 06:47 AM.
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Old 05-01-2013, 08:48 AM   #3
auto feature
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Sounds like a bad MAF sensor to me.
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Old 05-01-2013, 10:36 AM   #4
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Originally Posted by auto feature View Post
Sounds like a bad MAF sensor to me.
I agree. Sounds like a MAF sensor
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Old 05-01-2013, 11:36 AM   #5
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Is the SES light on? Check the MAF, but is it happens when cold, Vanos seals are suspect.

GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
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Old 05-01-2013, 05:41 PM   #6
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My Ride: E46 318i SE saloon
Thanks for your suggestions so far!

I've also had suggested, throttle position sensor, spark plugs not in correctly or one of the leads not connected properly, and also lambada sensor.

Had no idea the car had so many sensors and what not
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