I have a 1987 325E BMW with M20 engine and 5 speed manual Tranny.
There has been this intermittent problem with the idle surging
up and down between 800-1000 rpms. It only does this when there is no load on the engine. If you are sitting at a red light/stop sign then it occurs,
especially in the morning or when is a little cooler outside. Once you put the car in gear and being moving the problem goes away.
We have replaced all the vacuum hoses and checked for leaks like a month ago.
I pulled the ICV off and cleaned it out with brake parts cleaner too.
Anyone have any ideas what is going on with it?
My best guess is the idle control valve is going bad.
Thanks much! :)
There has been this intermittent problem with the idle surging
up and down between 800-1000 rpms. It only does this when there is no load on the engine. If you are sitting at a red light/stop sign then it occurs,
especially in the morning or when is a little cooler outside. Once you put the car in gear and being moving the problem goes away.
We have replaced all the vacuum hoses and checked for leaks like a month ago.
I pulled the ICV off and cleaned it out with brake parts cleaner too.
Anyone have any ideas what is going on with it?
My best guess is the idle control valve is going bad.
Thanks much! :)
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