Fast Idle Again
Discussion
Have just put the S2 back on the road after a 6 month break and it's just been away for a couple of days to have some suspension work done and the engine checked over. Picked it up Saturday morning and it handles wonderfully and drives much better but once it's warmed up I now have a tick over at 1500rpm. Checked all the mechanicals and everything is back at the relevant stop. Swapped the idle speed control valve with a spare I had in the garage and exactly the same symptoms. From cold it starts perfectly and ticks over at just above 1000rpm as it should but after driving for a while I get the elevated tick over.
Have searched previous threads on this but didn't come to any clear conclusions. Before I head off to the expensive diagnostic man I'd be grateful for any help anyone can offer.
Chris P.
Have searched previous threads on this but didn't come to any clear conclusions. Before I head off to the expensive diagnostic man I'd be grateful for any help anyone can offer.
Chris P.
This could be a number of things. you may end up on a test rig in the end to find this.Remember that the idle speed is from the computer ecu / emu etc.
This could mean a failure of various sensors which may well be a bit of a pig to find.In saying that, it is nearly always a bad conection that gives a bad reading which then in turn leads to a problem.
So my advice would be, firstly unplug all the sensors you can, clean all the contacts and then try again. If that don't work, get the car ticking over fast, when its hot, then unplug the throttle pot. If it drops back to near normal it could, be the pot, and thats about £45 to replace. bear in mind, that if you start replacing all these bits one at a time it will cost you a arm and a leg!
In some cases it may be cheaper to have it tested and find the fault at once. It could just be a £10 sensors thats knackered.
Give the first bit a try and get back on here and we'll work on it a bit more.
gadgit.
This could mean a failure of various sensors which may well be a bit of a pig to find.In saying that, it is nearly always a bad conection that gives a bad reading which then in turn leads to a problem.
So my advice would be, firstly unplug all the sensors you can, clean all the contacts and then try again. If that don't work, get the car ticking over fast, when its hot, then unplug the throttle pot. If it drops back to near normal it could, be the pot, and thats about £45 to replace. bear in mind, that if you start replacing all these bits one at a time it will cost you a arm and a leg!
In some cases it may be cheaper to have it tested and find the fault at once. It could just be a £10 sensors thats knackered.
Give the first bit a try and get back on here and we'll work on it a bit more.
gadgit.
Thanks for the input. As you said I'm trying to avoid the diagnosis by process of elimination route so I don't really want to go buying parts until I'm clear I'm going to get a result. I think I need to do some more investigation myself before I decide whether to take it to the diagnostic man.
Thanks again.
Thanks again.
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