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Cooper MPI odd Idle behaviour (12 replies)

Kieran
7 years ago
Kieran 7 years ago

Cooper MPI odd Idle behaviour

Kieran
7 years ago
Kieran 7 years ago

Graham, yes didn't change the TB or the IACV.

If it happens again I might, plus they didn't have any, maybe a future improvement. Not so keen on plastic!!!

Kieran
7 years ago
Kieran 7 years ago

Ok so I popped to Minispares today but they Didn't have any IACV, so I got the other bits I needed and on the way home got some carb cleaner and electrical contact cleaner.

So when I got home after work I thought I'd tackle the other bits I had to do as they were relatively easy and had not intended to tackle the idle problem, anyway got the other jobs done quick so I thought I'd have a look.

So I started by removing the air filter an giving the throttle body a good clean with the carb cleaner, then took the IACV off and gave that another clean, also the sensor on the right hand side of the manifold, disconnecting all the electrical connections and gave them a clean as well.

I also gave the wiring a check but could see anything obvious, will double check again in day light

Took it for a test drive and it seemed better but when I got back into my drive it was idling at about 2000 rpm, so I took this opportunity to leave it running , open the bonnet and I disconnected the electrical connection to the IACV but the revs didn't change, really confused as I thought this was at fault!!!!!

I can guess that the Idle Air Control Valve controls the air, but how is it just on/off i.e. open/closed?
Is it the same as a old fashioned chock?

My original thoughts of it been mechanical still stand because when I blip the throttle pedal the revs drop.

It was suggested yesterday at the shop that it might be the Throttle body as I have a Plastic one, it looks ok to me so not sure.

So plan today is to go get a new throttle body, a new THROTTLE POTENTIOMETER and a new throttle cable then when I get home I will start by replacing the throttle potentiometer, see if that makes any difference, then the throttle cable and then finally the throttle body if the others haven't worked.

Unless anyone has any other suggestions?????

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