[DML] Re: update on #2613
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[DML] Re: update on #2613



See Message #74176.

If your vacuum advance solenoid isn't plugged in, and if the vacuum
lines are set up per factory design, and if the vacuum advance
diaphragm doesn't have a hole in it, you have way to much spark
advance at idle. There's no way to properly tune the rest of the
engine like that.

Unplug the vacuum line at the distributor and check for vacuum at
idle. If it's there, you're going to need to resolve that issue before
proceeding any further.

Regarding the engine mysteriously dying: Have you ensured CIS is OK?
Mine died at a stoplight. Butterfly in the idle speed motor closed and
would not reopen. I had to nurse the car home by cracking the throttle
plates at each stop with the accelerator pedal. That's when I figured
out how the manual idle circuit worked -- and threw CIS away.

Before flaming me remember: my engine at that time was a B27E. CIS was
grafted onto it (with no provision for an idle microswitch, it was
hard wired active all the time). The idle speed motor may have simply
burned out due to continuous use.

There's absolutely nothing wrong with activating the manual idle
circuit to see if your random dying goes away. If it does, Bingo --
CIS is sick. Didn't your car come with the manual circuit open? I
remember well intentioned people telling you to close the brass
screws. They may have forced you into problematic CIS.

There's a procedure for manually idling the engine in the Files
section of the Yahoo website:
http://autos.groups.yahoo.com/group/dmcnews/files/Other%20PRV%20Literature/

Properly functioning CIS is a beautiful thing. Sick and failing CIS is
a pain in the arse.

Bill Robertson
#5939



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