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Engine not returning to idle

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Robert View Drop Down
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    Posted: 12 Sep 2020 at 1:39pm
I have an E30 M3 that is having trouble with the idle control.

When you rev the engine a bit it will then stay at around 2000rpm for about 10 to 15 seconds before settling back down to a slightly higher than it should idle of 1000 to 1100rpm.

I have had the ECU refurbed and replaced the ICV (Idle Control Valve). In all other respects the car is running fine and the economy is good.

If you unplug the ICV when the engine is running and doing it's idle at 2000rpm it will immediately return to idle OK but around the 1000 to 1100rpm mark.

I have also replaced the short section of hose leading from the top of the ICV to the distribution piece where the idle screw is.

Am I right in thinking there is still an air leak somewhere or can it be a poor electric cable?

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