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'93 940 Rex-Regina - Gradual Rise to Too-high Idle 900

posted by  spook on  Fri Dec 6 14:11 CST 2019
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear Fellow Brickboarders,

Hope you're well. On start-up the engine idles at 800 revs/minute. As the engine warms to normal operating temperature - temp gauge needle in the center - idle speed climbs to 1,500 revs/minute.

Thinking that corrosion might cause this rise in idle speed, I applied Deoxit to clean the idle air control valve (IACV) connector. No change.

Is the root problem an internal fault in the IACV, such that as the engine warms, the IACV malfunctions?

Wouldn't a vacuum leak cause a steady high idle, rather than a slow rise from normal to excessive?

I've replaced the engine coolant temperature sensor.

I hope to have the benefit of your insights.

Yours faithfully,

Spook






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