M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: chasingsafety on June 08, 2009, 03:35:53 PM

Title: Hiccup upon coming to a stop
Post by: 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

Title: Hiccup upon coming to a stop
Post by: DesktopDave 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.

Title: Hiccup upon coming to a stop
Post by: tjts1 on June 08, 2009, 05:40:06 PM

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

Title: Hiccup upon coming to a stop
Post by: B318M42W 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

Title: Hiccup upon coming to a stop
Post by: DesktopDave 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?

Title: Hiccup upon coming to a stop
Post by: roundel318 on June 09, 2009, 10:42:30 AM

Vacuum hoses are rather popular points of funky idle :)