KOEScoob

Just made a trip up to reading, first short run from Uxbridge after a year. Passed MOT with flying colours the day before. About to get off and the cars check engine comes on. Diagnosed it by my good friend FB tuning Richard. Idle control valve gone. Thought I’d clean it so took it out loads of carbon on it but no luck. Ordered a new one. Car drives but idles horrible and consistent reving up and down between 1k 2k revs. Anyone had similar problem? Looks like the OEM control valve and never been changed. waiting patiently to fit it.

Floyd

iTrader: (9)

I've had this issue. I tried a non OEM replacement from ICP - about £20 IIRC and although it didn't stall, it had a very high idle speed. I didn't try to reset the ECU to see if it needed to settle down. I tried several second hand IACV's, with no luck (all cleaned and prepped), until I found one s/h unit that worked. One tip I read from Bob Rawl, was to gently pull the stopper out as far as it will go before fitting as he believes it help the ecu calibrate it. I haven't tried that and don't pull it out completely.

KOEScoob

Interesting, i picked up a ICP one, and installed it, it worked with no issues at all. When i first put it in, i have to admit, it was revising silly high and flagged the engine light again, but then after it had warmed up it was okay. i also cleaned the internals with brake cleaner as the carbon that had built up was probably there from new. But no issues now. Car drives great and surprisingly idles way better than before.

IdonthaveaScooby

The engine light switched off after it had warmed up ??

Iv been through several new icv on another car , revved stupid , no matter how warm anything was


maybe after switched ignition on / off 30 x , half an hour running the ecu would have learnt something but I doubt

i think mines just dodgy loom

KOEScoob

yes, correct, the engine light turned off after the car was warmed up. even on cold starts, its still off, so i believe it has sent the right signal to the ECU. did you try to disconnect the battery for 10 mins so the ECU resets itself?

semih

you have to reset ecu, disconnect battery then try again,

i changed mine too, after installed new one very high idle, but when i reset the ecu, car was fine

IdonthaveaScooby

I tried the battery disconnect before now ,didt do an​thing

recently have let it run 20 mins, and eventually it got back down to normal idle ...


but next cold start same story

KOEScoob

That is strange. could it be a sticky throttle body? Have you cleaned the inside of the inlet properly with break cleaner, It needs to be super clean. But i cant think of what else it can be. If you are still having trouble i would suggest contacting richard at FB tuning.

semih

by the way i'm cleaning iacv port every year, still a lot of dirt

IdonthaveaScooby

I think sticky throttle sensors can be confused for sticky icv's.....

KOEScoob

How did you get on buddy..

IdonthaveaScooby

This is not on a scooby btw

its xsara , multiplexed and quite possibly just dodgy wiring / ecu .

iv been round and round and round and round trying to isolate issues

( French )

including 4 different icv's

KOEScoob

LOL and there is me thinking your going on about a classic. Okay i dont tihnk i could help you out on this one anymore, may be try local forums for this type of car.