RE: [DML] Re: Timing procedure

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Jeff,
The microswitch also turns on and off the idle speed motor. You can normally
hear and feel the vacuum solenoid click on and off when you have the car
running and are reviving the motor up enough to get the micro switch to
trip.
Also, The TTS switch works with the cold start valve not the Vac solenoid.
The vacuum is diverted by the green air vac pivot switch ( 3 rubber hoses )
under the intake manifold in the internal water pipe. If everything is
working ok, the vac solenoid will turn off the advance at the distributor
diaphragm while your doing the timing.
John Hervey
www.specialtauto.com



-----Original Message-----
From: Jeff Phillips [mailto:jeff.phillips@xxxxxxxxxxxxxx]
Sent: Tuesday, August 03, 2004 11:56 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: Timing procedure


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

--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx>
wrote:
> Your vacuum advance solenoid is not operating properly. There should
> be no advance at idle.
>
> In the DeLo setup, vacuum advance is either full on or full off.
> Solenoid cuts off vacuum at idle, then shoots 100% as soon as the
> throttle plates open (idle speed microswitch opens).
>
> Plus there's no solenoid to malfunction, as yours obviously has.
>
> Delay valve is for Series 066 CPR full throttle fuel enrichment --
> another complicated setup that early imported Volvos (Series 004
CPR)
> and European PRV's (Series 038 CPR) avoid with a simple plate
> connected directly to manifold vacuum. Later imported Volvos used
> Series 066 CPR as well.
>
> Bill Robertson
> #5939




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