The Engine and other mechanicals 47 Idle speed wobblies
74 Citroen XM Internet Reference Version 1.0
3/3/99
47 Idle speed wobblies
My XM (1992 2.0i) occasionally seems to lose track of idle speed. It happens in Neutral or Park; from an
ordinary sort of speed (about 900 rpm on the clock) it speeds up over a few seconds to 1500, 2000,
2500 or faster. No foot on the throttle, nothing. It’s never happened when idling in gear.
When it happens, the way to get the engine back to normal speed turns out to be to press the switch that
cuts out the air conditioner (it’s got airconditioning but not the pushbutton computerised ventilation
control panel). This has worked every time so far.
I presume it’s a poor connection on some sensor or earth somewhere; does anyone have a suggestion?
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