I have been having really bad problems at idle when i first start my car, even when i try to accelerate out of my parking spot, it sputters and wants to stall, and at idle i hace an extremely bad rattle, seems like only when the electric fan is on????
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Bad Idle & Awful Rattle
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i have the same issue,.. and my rattle is right around idle,... but goes away with even a little gas,.. sounds like a heat shield, or something, i havnt had time to really look into it,.. but i have heard lots of people complain about the hesitation on a cold start,.. mine does it too,.. i just give it a min and dont abuse it while its waking up...
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Well, the cold start issue is a very common problem throughout most BMW's. Especially our cars and the new M3s. Theres a software update released by BMW a few years back for the DME to help smooth out the cold start... but only a little.
Your best bet is to let the car idle until it smooths out then start going. Dependong on ambiant tempature, this could be anywhere from 10 seconds to 1 minute.
Is the rattle comming from the area that sounds like its by the transmission? The heat shields on the cats are known to come loose and rattle like a SOB. You can either remove them, jamb a large screws up inbetween the shield and cat (what I did), or find someone to tack-weld them back into place.
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