[DML] Re: Idle fluctuates between 600 and 1500 rpm
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[DML] Re: Idle fluctuates between 600 and 1500 rpm


Did this symptom just start without any touching of the components?

Your symptom is usually related to low control pressure and is common on cold engines - normal mechanical adjustment variants and small vacuum leaks.

I would say you need to check for correct routing of the vacuum lines to the thermal control valve, etc., if your symptom had started after new vacuum lines were installed. However, just out of the blue,---I would say check to see if the control pressure regulator vent is open (no bugs stuck in the vent, etc.).

Next I would check to see if the thermal control valve has failed (rare - but it happens). To check it see ST-32-12/81.

Harold McElraft - 3354

--- In dmcnews@xxxxxxxxxxxxxxx, "Paul" <paul.sweet@...> wrote:
> I need some advice. My idle was fine until I took a ride today. When the car is warmed up the idle fluctuates between about 600 and 1500 rpm - very annoying and almost wants to stall. All my vacuum lines are new and connected correctly. However, perhaps this will offer a clue to someone who may be able to help. If I disconnect power or the middle vacuum hose to the ignition solenoid valve, the idle smooths out. There is vacuum on that middle rubber hose too. The solenoid valve clicks when the microswitch is engaged. I can hear the air inake plunger suk air to catch up after each fluctuation. The frequency valve buzzes and hums as it should. Can anyone offer any ideas what might be causing the idle fluctutation.
> Thanks,
> Paul
> Vin 10944


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