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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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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Could it also be symptomatic of an oxygen sensor on its way out?
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In addition to Andrew's comments,could well be a problem with the idle control motor .
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