High idle after air intake replacement

[Lowdon]

Hi all, I'm stuck with a repair and hoping someone has a clue how I might solve it.

I recently replaced the air intake on my petrol 1999 (2l DOHC) transit as the old one was cracked. After replacing it was idling high, which I thought might be due to dirty valves

What I’ve done so far:
-- Replaced the cracked air intake.
-- Cleaned the throttle body and butterfly valve with carb cleaner.
-- Removed and cleaned the idle control valve (sprayed cleaner through it and let it dry).
Reassembled everything carefully.
-+ Checked that all intake hoses are connected properly and tightened
-- Let the engine idle to relearn and then drove it for about 15 minutes.
-- Engine runs smoothly, but idle is still much higher than normal. Exhaust is smoking a bit.

Last thing: tonight I've disconnected the battery to reset the ECU and let it relearn idle again. But I'm not confident enough his is going to do anything.

What else could I have missed?

[metalworker0]

if no answers within another 24 hours - put this into google

"ford transit 2.0 dohc throttle reset"

AI tells you what to do


all the best.mark

[madmart132]

Hi , high idle is down mostly to air leakage. Spray some WD-40 around the various connectors for the air filter box butterfly valve , idle control valve and also check you put the vacuum pipes on correctly. Remember your van is now over 25 years old maybe over 30 years old, some of the plastic lines going into the manifold get extremely brittle check those as well