Hi afternoon I am hoping someone can assist.

My MG ZS 2.5 is reving at idle and the revs increase when I press the clutch often up to 4000rpm. They eventaully stop and the car will drive normally and then this will start again at random times - the issue is getting worse.

I have read many forums and think it will be either (a) air leak around throttle body (b) idle air control valves or (c) stepper motor plug.....
(have tried resetting stepper motor)

I am not mechanically minded and due to the car being converted to LPG fuel only certain garages will help so was hoping to get assistance before taking to a garage?

Seems to be an issue with the cold - it's pretty widely reported.

I think cleaning the throttle body and idle air control valve out is the usual fix.

okay no probs ill try this at the weekend - was worried this was going to be a costly issue, it is worse with the cold but has been happening for a good few months - very embarassing at traffic lights and dodgy driving on the ice when reving itself...

Thank you very much

No worries, I've just confirmed it with a friend with a ZS180, who had the same issue.

The throttle body and idle control valve do indeed get gummed up, a good clean should fix it.

Mat

I had this problem. It was completely random. I cleaned the idle valve which is easy but it turned out to be a pipe fouling the throttle body mechanism underneath. It had the guys at the local garage scratching their heads for a while!

I had a similar problem to this not reving so high as that, but engine wanting to cut out and spiky reving at idle.

If you sat it at idle and steered the car, or used the blower on full, or braked the engine cut out all to gether.

so just imagine pulling up to a round about you put the clucth in as you aproach under braking. engine cuts out. Yes lots of fun.

Turned out that the ECU was grounding with its support harness.