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Idle erratic on cold starting

1K views 2 replies 2 participants last post by  Yogesh buch 
#1 ·
Hello
I have a cold start issue with my Renault Laguna mk1 16v 1.7cc petrol engine. When starting the idle raves up and down upto 3000rpm. At first it was only doing so at lower rpm of 1500-2000 just over 2 yrs ago. But this yr it has gone higher. Noticed that it used to do it when in cold temp but now it seems to go even at higher temp of 10c..if I start and don't drive right away it starts to come down in 2-3min back to normal of 800rpm. There is no warning lights and it does not cut out. If I drive straight after starting then it takes a long time to come down to normal rpm...Also noticed that if I put the fan to no 2-4 after ages min of starting rpm seems to drop back to normal faster and same if I turn the stearing while waiting to warm up.
Have changed the ICV and checked all electrical connections ..but still no result.I have tried to clean the throttle valve in situ as well.
Any ideas please what could be doing this?
Thanks you
 
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