My apologies for registering and diving straight in with a problem but I'm at a loss!!
The story as follows.
My Focus is a 2002 1.4 with only 80,000 miles on the clock. The issue with it is the idle air control valve opens fully causing the engine to idle at ~3000 rpm's.
With the IACV disconnected the engine will stumble when cold but idles perfectly when warmed up.
I have checked about everything I can find, and did find the PCV hose was collapsing so I replaced that at a cost of £17 from Fords. I then did a ECU reset and reconnected the IACV but this made no difference with the engine still idling at over 3k.
Now comes the hard to answer question.
How would an IACV typically fail and would one fail in the open position?
When the ignition is on and whatever the state of the engine (running or not), if I connect the loom to the IACV it will pull fully open.
If not the IACV being faulty, I'm suspecting the PCM is the culprit.
Thanks in advance for your help!