Does the high idle control get power to it all the time when the ignition is
on, or is it only energized when the ignition is turned to the start
position? This is a quadrajet carb on a '81 Blazer. The engine has been
changed and whoever did it didn't hook the high idle control up. If it does
get power in the on position, can it be jumped to from the choke power lead
or does it need its own line pulled?
Sorry about these simple questions but it has been a while since I've
worked on an older vehicle and the Chilton's I've ordered hasn't got here
=============================Some vehicles are set up for power with the key on, some with the a/c
clutch and some the computer controls it. A wiring diagram is your best bet
for doing it right. Either way you can run it off pretty much whatever you
want. See if you can find an unused wire under the hood that was for the
idle kicker. If it idles good with/without the A/C and doesnt diesel no
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I'm trying to get a wiring diagram, but it will be a week or so before that
happens. This old Blazer doesn't have any computer controls that I am aware
of. I thought it was a couple of years later that they started putting in
the computers. I'll check and see if I can find an unused lead: a number of
wires were cut when the engine swap took place( I'm guessing that is when
they were cut).
I'm not sure I understand something though. If the air cond clutch
supplies the power, wouldn't that prevent the solenoid functioning when the
air cond is off? Or is the power to the air cond clutch all the time the
ignition is on and the clutch circuit is opened and closed on a ground leg?
I just can't imagine why it would be done that way. I definitely need that
I've already ordered a Chilton's repair manual and am working at getting
several other manuals off of ebay, a wiring diagrams manual included among
There's a small box above the accelerator peddle for the electronic
spark control, but it was probably disabled long ago. Look on the
firewall, just behind and to the passenger side of the distributor,
about even with the rotor. There is a plug in the firewall there. It had
a shielded wire going through. See if anything is still hooked up to it.
It went to the distributor and the knock sensor near the starter. If
it's gone, that's good.
That's what it's supposed to do. The solenoid turns up the idle when the
AC kicks on, keeping the engine from stalling or idling too slow.
When you turn on the ac control, it supplies power TO the clutch. The
pressure switch on the side of the dryer (Light green and dark green
wires going into connector) cycles it on and off with the need for
pressure in the system. The idle solenoid is in parallel with the
compressor. If you don't have AC, you don't need the solenoid hooked up.
If you may put AC back on it, it will be tied into the same green wire
that goes to the compressor. The wire is usually spliced in the harness
somewhere near the carb or firewall. I really can't remember, it's been
a couple of years since I yanked that harness out when I converted mine
to fuel injection.
That's the one, facing the front of the engine it is on the near right side
of the carb. This Blazer had an engine swap and the air cond comp was
removed. I'm trying to get the wiring diagram but haven't yet. Some of the
wires were cut and I'm not certain which went to the air cond comp.
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