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

posted by  spook on  Sat Dec 7 06:55 CST 2019
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear Blindboy,

Hope you're well. Thanks for your comments. What I don't understand is why the idle rate rises as the engine's temperature goes from "cold" to normal.

If un-metered air is the problem, that should lead to a high idle rate from start-up. That's not so here: it takes a few minutes from start-up for the idle rate to rise from 800-900 to 1,500.

By the way, is the hose - to which you refer - the main air intake hose? I inspected that hose: it seems to be in fine shape.

Yours faithfully,

Spook






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