Engine Issue #1 - High Idle

[ukkid35]

jammy_basturd said:

Work I have recently done after an extended period of being laid up:

• New rose joints on the throttle linkage.
• New o-rings on the thermal barrier when I last fitted the inlets.
• Engine setup procedure in the engine manual followed exactly.
• New spark plugs and HT leads

Hi James

Really sorry but my memory doesn't go back that far, however, I did everything you mention apart from replace the HT leads, and none of them seem to be the ultimate cause.

I can't honestly remember what the one crucial factor was, I even borrowed a flow meter from Peter Messling, but never got to use it.

I still have an idle well above 1000, but it doesn't runaway now, I've put that down to throttle shaft play.

I would check the state of the spriral throttle return springs, and fit one of Joolz long throttle return springs as well (assuming 4.5).

If I can think of anything else I will let you know, good luck.