erratic tachometer & engine vibration on 1st gear acceleration - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-06-2009, 11:08 AM
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erratic tachometer & engine vibration on 1st gear acceleration

Is it normal for have an erratic tachometer at the initial engine start? the dial jumps erratically up and down and then then stablizes after the initial warm up and RPM drops down to normal range (~600-700 rmp). Also, i felt either tire skipping or cluth skipping when i was trying to accelerate from stand still to high way speed. I initially thought it was cluth-gas coordination, but i felt the same thing when i was pulling into a parking lot at a much lower speed. (2005 325i, 45,000mile).

thanks in advance.
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#2 (permalink) Old 04-06-2009, 12:03 PM
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I would be leaning towards the MAF for the erratic start behaviour, Im presumming the revs are all over the place aswell??.

Easy way to check a manual clutch, park up a hill handbrake on and try and pull away in 2nd or 3rd depending on slope if it stalls the clutch is fine, however if it starts to slip and rev high ....clutch change.

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#3 (permalink) Old 04-06-2009, 03:48 PM
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what's MAF? the techometer dial bobs up and down within only a couple hundred RPM, but it was not like this before. I was assuming sth is not functioning properly. Also, i had a similar problem but much more prounced engine and cluth shaking and vibration, dealer changed a spark coil for me and seemed to get rid of the issue at the time, but it is a lot more subtle this time. Wondering if the other spark coils are about to expire too. thanks.
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