[Raptor04]

Anyone have ideas on why my n54 would idle around 900 rpms? Seems high to me. I'm getting a clunk noise when I let off the brakes from a stop and step on them again.

[madmantwo]

Originally Posted by Raptor001

Anyone have ideas on why my n54 would idle around 900 rpms? Seems high to me. I'm getting a clunk noise when I let off the brakes from a stop and step on them again.

Used to have that problem. Seems the DME raises the idle after experiencing mild misfires, so check your plugs + coils + injectors. I replaced my injectors and the idle dropped way back down to ~700 rpm. I never got any misfire codes at any point.

No idea why the clunk is occurring, probably unrelated.

[GoRomeo]

Originally Posted by madmantwo

Used to have that problem. Seems the DME raises the idle after experiencing mild misfires, so check your plugs + coils + injectors. I replaced my injectors and the idle dropped way back down to ~700 rpm. I never got any misfire codes at any point.

No idea why the clunk is occurring, probably unrelated.

Interesting find.

This is happening to me as well... I changed my plugs 2 yrs ago but never my coils nor injectors. Planning to replace my coils soon since i am still on the originals at 135k miles, also will pour some techron injector cleaner see what happens.

[zero2sixtyZ]

Originally Posted by Raptor001

I'm getting a clunk noise when I let off the brakes from a stop and step on them again.

Check motor mounts, sway bar end links and power steering pump bolts.

[Stucks]

Sounds exactly like what would happen to my car when one of my injectors took a crap. it would idle at 900 rpms, and coming to a stop, it would sort of buck/clunk a little bit. i pulled all my injectors to find #6 was toasted black and nasty. Replaced all 6 with index 12 injectors (i had index 6 or 7 at the time, and theyd been in there for 4 years ever since i go the injector recall done) and all was normal again.

[Raptor04]

my issue was a simple tune issue with MHD; uninstalled and reinstalled the tune and set the idle at appropriate rpm and everything was good to go.

[STR8-6IX]

letting go of the brake and experiencing a "clunk" could also be control arm related. ive driven an e46 320i before that the owner was desperately trying to rid of for a ridiculous price because the control arms were about to crap out on him.

[7smurfs]

Mine idles at 800 when warm... seems normal

[Raptor04]

It was the aftermarket tension strut bushings I installed....I had the strongflex red bushings and they were garbage and had to be replaced.

Originally Posted by 6IX-F10-N52

letting go of the brake and experiencing a "clunk" could also be control arm related. ive driven an e46 320i before that the owner was desperately trying to rid of for a ridiculous price because the control arms were about to crap out on him.

[STR8-6IX]

Originally Posted by Raptor001

It was the aftermarket tension strut bushings I installed....I had the strongflex red bushings and they were garbage and had to be replaced.

i mean, it had something to do with the control arms right