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Idle adjustment 91 740 Regina 700

posted by  Dave Stevens on  Tue Jan 17 22:06 CST 2023
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last visit: Sun Jan 1 02:36 CST 2012
[RELATED]

If the idle rpm drops down to 300-400, in fact anything below 700, then the ECU probably doesn't know the throttle is closed and it's supposed to be maintaining idle using the IAC valve (idle air). Best guess is the TPS (throttle position switch) is now incorrectly adjusted or the connector is not properly seated. With the engine not running, do you hear the TPS click just as you open the throttle spindle? It shouldn't be set on the hairy edge, but soon after the plate starts moving. Other issues with idle adjustment are the throttle linkage rod and throttle cable adjustment restricting the throttle plate from fully closing and clicking the switch. If needed there are OBD tests you can do at the diagnostic connector to check all of this out -see the FAQ here.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now






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