Technical Help Please - E30 320i

[Jon39]

I would very much appreciate any technical guidance that you can provide, to help resolve an engine idle speed fault.

BMW 320i E30 1984

My local mechanic has recently fitted a replacement fuel pump, and the engine is now running again.
The idle speed at cold startup is about 1100 rpm, but when the engine is warm, instead of the speed dropping to about 800 rpm, it increases to 1400 rpm and will not run at a slower speed than that.

The repair garage staff do good work, but are not BMW specialists, and they seem to be puzzled by the cause of this engine speed fault. They wonder if it might be caused by a leaking hose, but do not know which one, and work on my car has now come to a halt.

Yes I know, I should have gone to a BMW specialist, but originally I thought my car just needed a new fuel pump.

Thank you for any suggestions you have.

[helix402]

Try removing and cleaning the idle valve. Also Google is your friend:


http://www.msportster.co.uk/question/m20idleproble...

I'm sure if you search online some more you'll find more answers.