Slow to return to idle

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Wed 13 Mar 2002 20:28
Slow to return to idle - CB
Have owned a 1994 M reg Renault Clio 1.4i RT from new, currently on 50k miles.

It drives fine, though recently when pulling up at a junction/traffic lights, the engine has become slow to return to idle speed. By this, I mean the revs drop to about 1300rpm for about 5 seconds before then dropping to idle speed, rather than dropping to idle speed straight away.

The car has been used for short journeys so could this be caused by a build up of deposits? If so, is something like STP Complete Fuel System Cleaner likely to clear the problem?

Thanks.
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Wed 13 Mar 2002 22:02
Re: Slow to return to idle - Andrew Moorey (Tune-Up Ltd.)
Could well be a build up of carbon deposits on the throttle butterfly and inside the idle speed controller. Clean them up carefully with a propietory carburettor cleaning spray and an old toothbrush. Restart engine and allow to idle for 10 minutes. If the idle speed appears to be high disconnect the battery for a few minutes then repeat the operation followed immediately by a few road miles in varying traffic conditions.
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Wed 13 Mar 2002 23:27
Re: Slow to return to idle - Jonathan
Could it also be symptomatic of an oxygen sensor on its way out?
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Thu 14 Mar 2002 00:17
Re: Slow to return to idle - David Davies
In addition to Andrew's comments,could well be a problem with the idle control motor .
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