Stepper Motor

[Monkey276]

Th revs on my car decrease very slowly back down to idle.I've been told by this forum that it is due to the stepper motor needing cleaning. Where do I locate the stepper motor and how do I clean it?

[tvrbob]

It depends what you mean by slowly. It's supposed to reduce to tickover slowly. Stepper motor problems usually take the form of high or low final tickover revs.

[roy the boy]

There's a good description of how to do this here, but it is more a cure for 'erratic' tickover I think.

www.car1.clara.co.uk/tvr/stepper.htm

You just need to remember that the body of the stepper motor is plastic so be careful when unscrewing and tightening as it can crack. I cleaned mine with a bit of Autosol metal polish - brought it up a shiny treat. I also used a bit of PTFE tape for a good seal without the need to 'overtighten'.

Edited by roy the boy on Saturday 26th August 11:15

[Monkey276]

The car idles at about 2000 revs and very slowly, over about a minute or so reduces back down.

[GreenV8S]

Get it idling steadily at the right speed, disconnect the stepper motor. If the problem goes away it's a stepper motor/wiring/speed sensor/ECU problem. If it remains, you have an air leak, sticking throttle or other problem of that sort.