The car has been in the garage now for a couple of weeks.
I started the car up and left it running for about 3-4 mins
when i came back i revved the engine while it was still in park.
when the revs would start to drop the engine/car would shake.
it happens once in a while. always on a cold start. instead of letting it sit and warm up, i just take off (gently) and let it warm up that way. doesnt happen to me anymore.
Did you get your coil packs changed with the recall several months back? My car started shaking while in park when I started it, took it in, found out BMW NA issued a recall on on 99-05 3-series on faulty coils, which causes misfires.
wait a second: does the rpm kinda dip below the normal idle of 700? sometimes the car when started when its cold and after a while, i notice the RPM needle dip down below 500, and this is after i reved it. feels like, if your car is a stick, that you have a noticable amount of vibration from the engine.
yeah mine dips when its cold i think all the manual trans do it if it was just that once i wouldnt be to worried about it just cold start/motor has sat for a while type of thing if it begins to happen all the time thats when you should worry
dudes, this is a very well known and documented problem for the e46. search 'cold idle' or 'cold start' in the general forum and you should see well over 100 threads covering this.
^ (that is, if i'm understanding the OP correctly)
Happens with my car on real cold mornings and if i havent started it in a few days, as soon as i start it i feel the vibrations through the steering wheel, it sounds kind of irregular at first but sorts its self out..
I think its a bmw trait as a lot of people notice it.
coils are a issue yes. but it isn't always the case. the engine lifters is my guess as youve mentioned the vehicle had sat around for "x" amount of time.
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