Fast Cold Idle

[Griffer]

I think this has been discussed before but cant find the thread.Started the Griff 400 and all well until I touched the throttle, now idles over 2000rpm, the plenum throttle is closed fully, stuck stepper motor?
Did this once before months ago but cured itself.
Any advice guys?, any info gratefully received.
Thanks in advance,

Griffer

[Griffer]

Zippy500, thats exactly what mine did before it cured itself last time, GreenV8S I last cleaned stepper about 6 months ago and will do it again tonite, idle now over 2500rpm ,will post findings if I find anything obvious,any other ideas anyone?
Cheers,
Griffer

[Griffer]

Good news,fixed it,big air leak at the stepper motor as it was loose!Cleaned the seat as well as the tip, tightened it up properly and all is well.
Cheers,
Griffer

[Griffer]

robperrie, the stepper is at the rear drivers side of the intake plenum,use 1/1/8" spanner or adjustable to remove after undoing the loom connector,clean the conical tip of all carbon and the seat in the plenum with a bit of rag on a stick, dont scratch it though.
There is a thin sealing washer on the stepper and thats where mine was leaking.Dont overtighten or you will bust it. Good luck.
Griffer