Re: Re:
Induction air leak would tend to be fairly consistent. As you say, iffy leads and / or plugs / coil, probably more stumbly at idle.
The only other thing to mention, and it's something I saw with very similar symptoms to what you're having, and no error codes available, was what I believe an electrical fault in either wiring or the TPS (throttle position sensor) which seemed to also have underbonnet heat as a factor.
When it idles at those speeds, does anything happen / change if you blip the throttle?
At the end of the day, on non-ETM cars, the factors that could be influencing idle speed, are either sticking butterfly (which you've checked), sticking throttle cable (typically not that difficult to change), sensor problem causing rich fuelling (which you'd expect to show up as some kind of out-of-band error), induction leak - which you'd expect to be pretty consistent and always present, sticking / knacked IACV, or some sensor (eg TPS) issue causing the ECU to think it needs to have the IACV open more, and as a consequence, upping the idle speed.
The IACVs that I've looked at, didn't have gaskets connecting them - they were plumbed via a couple of induction hoses. They were fairly easily removed, and reasonably easy to check whether they were sticking (how gummed up they were, and how freely the flap moved).
I've also removed throttles loads of times and reused the gasket between them and the inlet manifold - although I recognise it's good practice to replace.
Well that sounds like the IACV (given the other things you've checked so far).Harryburgundy":2peca6f2 said:
Induction air leak would tend to be fairly consistent. As you say, iffy leads and / or plugs / coil, probably more stumbly at idle.
The only other thing to mention, and it's something I saw with very similar symptoms to what you're having, and no error codes available, was what I believe an electrical fault in either wiring or the TPS (throttle position sensor) which seemed to also have underbonnet heat as a factor.
When it idles at those speeds, does anything happen / change if you blip the throttle?
At the end of the day, on non-ETM cars, the factors that could be influencing idle speed, are either sticking butterfly (which you've checked), sticking throttle cable (typically not that difficult to change), sensor problem causing rich fuelling (which you'd expect to show up as some kind of out-of-band error), induction leak - which you'd expect to be pretty consistent and always present, sticking / knacked IACV, or some sensor (eg TPS) issue causing the ECU to think it needs to have the IACV open more, and as a consequence, upping the idle speed.
The IACVs that I've looked at, didn't have gaskets connecting them - they were plumbed via a couple of induction hoses. They were fairly easily removed, and reasonably easy to check whether they were sticking (how gummed up they were, and how freely the flap moved).
I've also removed throttles loads of times and reused the gasket between them and the inlet manifold - although I recognise it's good practice to replace.
Sounds like the ICVS to me having had one go on my 2002 Bug WRX .
