Re: [DML] Re: Timing procedure

[Martin Gutkowski - DMUK <martin@xxxxxxxxxxxxxx>]

The simplest thing is to run the engine up to temp (solenoid is only 
gets vacuum when the engine's hot). Then unplug the vac hose to the 
dizzy. If the solenoid is indeed allowing vac advance at idle, the 
engine will immediately stumble. If it's working, it should do nothing.

You're correct in your analysis. The idlespeed microswitch also tells 
the idlespeed control ECU that the engine's idling. When it's open, the 
idlespeed valve closes.

Martin

Jeff Phillips wrote:

> So I should see current across the vacuum advance solenoid when the 
> Idle Speed Microswitch is closed and when it opens the current should 
> turn off, which in turn opens the solenoid and provides the vacuum 
> advance to the distributor.  This of course only happens after the 
> thermo-time switch has warmed up and diverts manifold vacuum to the 
> solenoid instead of the Control Pressure Regulator correct.  What 
> else does the Idle Speed MicroSwitch control other than the vacuum 
> advance solenoid?  Would it be a sufficient test to see if the 
> current at the solenoid turns on when the switch is closed, and then 
> if there is a subsequent presense of vacuum at the distributor?
> 
> Jeff





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