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Idle adjustment 91 740 Regina 700

posted by  machine man on  Mon Jan 23 22:19 CST 2023
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last visit: Wed Oct 22 15:40 CST 2014
[RELATED]

Hi,

Glad to hear you made progress with the mysterious idle issue.

I was suspecting the throttle body area with air leakage.
The TPS and the throttle plate need to move repetitively to a minimal air allowance into the engines operation.
The IAC has limited capabilities or range of operation in idle mode per the TPS command.
The AMM mixture setting is “before the fact” of extra air slipping by. It does nothing correct mixtures in any mode. The ECU is looking at the exhaust sensor and RPMs and their alignment to the program lines.

So I’m saying, if you think you moved those other two settings then the computer is no longer out of sync to the throttle body.
Cleaning the ECU pins is not to be ruled out either.
So it’s good you are on top of that possibility and capable to have one on hand it seems.

Again, glad to hear it.
Thanks for the feedback

Phil





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