I have a BMW220ci and I can hear a rattle undernesth when driving over bumps. The exhaust seems ok and I have checked the spare wheel and the other 4 wheels for security. The car is 3 years old, fully BM maintained and I have had it for 3 months.(35K on the clock)
Also when I take my foot off the accelerater and dip the clutch the engine revs are slow to drop especially in 1st gear (at traffic lights or at a fast pull away especially noticeable)
Also If I am crawling in traffic in 1st gear with the clutch slipping and the acceleraretor held at a constant point the revs go up and down slightly. Is this a clucth problem or engine management and are the problems linked?
BM have checked the engine management system and cleared the driving style memory but say its OK. I am on the verge of trading it in for a used MercE320 cos Im peed off with it. Any thoughts?
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The rattle could be the exhaust. Give a few firm 'thumps' with the side of your fist at various points along its length. Could also be a shock absorber or even pads rattling in the caliper. Its hard to diagnose noises 'at a distance'.
Can't help on the engine rpm issue, but I did once trade a 530 that had a idle that wandered up and down at random. Replaced the idle valve but didn't cure it. I suspect it was the ECU, but it was sold (to a trader) before I had time to look further.
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a 220i ???
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\"dont shoot the messenger\"
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When I purchased my second hand 320i the rattle it came with turned out to be a loose battery in the boot battery container. The battery was the wrong type/size for the car and could not be restrained, so it slid backwards and forwards and bumped up and down. GGH
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my fuel filter rattled,,,,a small adjustment later and all is ok.Seemed it was held up by the fuel pipes!!!
have a look ,,its about half way down the car(underneath)
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\"dont shoot the messenger\"
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I had an annoying rattle when I purchased my BMW 323i E46 secondhand. It turned out to be a broken rear coil spring. This is very common on this model (mentioned in HJ's whats good/bad on this model). The coil spring is tapered and at the bottom it fits into a cup and you cannot see if it is broken at the narrowist point (mine even passed the MOT like this). Eventually I took it to the Stealer and they diagnosed it straightaway. They said it can be caused by putting very heavy objects in the boot...fortunately the car was still under extended warranty and they replaced both rear springs while I waited FOC - took about 1.5 hours.
The noise sounded like something loose on the boot.
Regarding the other problems, the revs ARE slow to drop on this car - other owners have commented on this- is it excessive?
On mine the revs do go up and down slightly (peroidically) at idle when the A/C is on. Doesn't do it when the A/C is off, something to do with the engine management boosting the revs to drive the A/C I think, I'm not a mech so could be talking rubbish but I'm sure I read this in HJ letters sometime ago. Also just had Insp 2 at Independent BMW dealer and he said it was ok.
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