Author Topic: Hiccup upon coming to a stop (Read 2834 times)

chasingsafety · « **on:** June 08, 2009, 03:35:53 PM »

So, new to the club, just picked up a 91 318i m42 and loving it so far. One thing that has threw me off a little is after downshifting to a stop the idle will drop to almost 500rpm, stumble and then bounce back up to 900rpm. It only does it once until I take off again, come to another stop and it will do it again. Puzzles me a little. Any thoughts on where I should start? I should also mention it is a 5 speed

DesktopDave · « **Reply #1 on:** June 08, 2009, 03:48:31 PM »

You have a little idle control valve that causes trouble...it's attached to a hose off the rear of the upper intake manifold. Do a search for 'ICV', you'll find all sorts of fun...

Welcome to the board, these cars are a blast to drive! They're even pretty easy to take care of.

tjts1 · « **Reply #2 on:** June 08, 2009, 05:40:06 PM »

Your ICV is fine. You have vacuum leaks. See my signature.

B318M42W · « **Reply #3 on:** June 08, 2009, 10:32:47 PM »

Quote from: tjts1;73277

Your ICV is fine. You have vacuum leaks. See my signature.

you'd be a millionaire if you got a dollar everytime your sig was problem...

and +1

DesktopDave · « **Reply #4 on:** June 09, 2009, 06:49:38 AM »

^^^LOL...but seriously, those hoses are about 80% of the trouble we have here, aren't they?

roundel318 · « **Reply #5 on:** June 09, 2009, 10:42:30 AM »

Vacuum hoses are rather popular points of funky idle