Idle problem after cleaning IACV


M

mov

Member
Joined
Nov 17, 2010
Messages
177
hi guys,
i recently cleaned out the IACV and now idle hunting but it only does this when warm. i noticed this happened most when car was at traffic lights.
i went out to inspect what the problem could be after reading afew threads on here, but no luck.

i could an whilstling noise from somewhere near the IACV pipes but cant locate where from.
as i held the the pipes that connects to the IACV the idle smoothed out and the whistling went away. but i cant find any leaks, split or cracks, i also sprayed carb cleaner all over the place but nothing. :angry2:

could it be an air lock in the coolant system??

btw the engine is a b18C from a 1996 DC2

any help would be most appreciated. :))

thanks
 
Last edited:
try putting soap suds to the IACV pipes so you can locate more of the leakage..it could be a very tiny leak or crack
 
...why spray carb cleaner all over, what will this do other than the possible fire in your engine bay? ...seriously, why?
 
tama666 said:
...why spray carb cleaner all over, what will this do other than the possible fire in your engine bay? ...seriously, why?
Click to expand...

Its a common way of diagnosing air leaks. The engine will be running lean due to the leak - or oscillating due to lambda feed back, adding extra volatile hydro carbons into the leaking air will cause the RPM to rise.

Sprying it at the inlet is very different to spraying it at the exhaust.

Soap is only going to be effective if the air is blowing out...

If you disconnected the IACV from the manifold I'd expect that the seal is broken and the air being pulled in around the solenoid body. You can remove the large air feed pipe from the IACV, it will not effect anything as the air only goes in through there and running unfiltered air for a test period is not going to hurt anything. The problem will most likely be - the gasket/seal between the the IACV body and manifold - you reused the gasket right?
Or that the cleaning has dislodged some muck and the valve isnt seating right - which is allowing air to flow through.

My money is on the first - get a new gasket, clean the mating surfaces CAREFULLY with a Stanley blade or scraper and bolt the thing tight.
While the IACV is off, inspect what ever you can. I am not sure if its a fail open (if the IACV gets disconnected/coil burns out the solenoid opens and means you have high revs) or fail shut (would seem daft but...) but it might pay you to blow out the air tract in the opposite direction to normal flow.
 
You must log in or register to reply here.
Back
Top