High tickover on over-run

[Plipton]

I have a problem with my Chimaera 450 (97 model which I bought in March 2002) which happens quite often on over-run.

When I lift off the accelerator the car seems to hold part throttle. If I dip the clutch at this point the engine revs drop to about 2000RPM then slowly decrease to tickover (8-900RPM). If I'm stopped at traffic lights etc the engine won't settle down to idle for several seconds (up to 30 seconds).

The engine temperature etc. seem to have no bearing on when this happens - it just does it sometimes and not others. Could this be the stepper motor?

I noticed that the ECU has '5 litre engine' printed on it, but the local dealer said this was nothing to worry about (but he would say that I suppose).

Has anyone suffered from this problem? If so what can I do to cure it?

>>> Edited by Plipton on Wednesday 16th October 09:12

[Plipton]

Thanks Keithyboy.

At the risk of sounding like a complete dumb@ss can you tell me where the stepper is? (Have only worked on aircooled VW engines and old pintos, you see, so the V8 is a bit, er, challenging) If you have a picture it would be very helpful.

Also do you know where the rad thermostat is located - I think mine's stuck open.

Thanks

Plipton

[Plipton]

Thanks for the help

Plipton

[plipton]

I wipped mine out and gave it a damn good scrub (Stepper, that is). It was well sooty.

Seems fine now. Thanks for the technical info