Re: [MV] CUCV New Problem

From: chance wolf (chance_wolf@shaw.ca)
Date: Sun Feb 06 2005 - 16:23:48 PST


----- Original Message -----
From: "Stu Ellis" <stuinnh@mvnut.us>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Sunday, February 06, 2005 12:16 PM
Subject: [MV] CUCV New Problem

> Hi all!
> By 1009 has suddenly started shutting down while driving if you take your
> foot off the gas too fast. It idles and drives fine. Any ideas what it
> is?

Your Cold Advance valve is probably partway plugged, or you could have an
intermittent in the shutoff solenoid itself. The top front of your injector
pump has a hose going to it. Between that hose and the pump body itself is
a black valve assembly which consists of a little glass ball and a spring.
Take that off and try to blow through it. You can operate the little ball
inside with the end of something like a safety-pin, and you should be able
to blow through it fairly effortlessly when 'opened' with the safety pin,
and likewise it should make a pretty good seal against blowing when you're
not working with the pin. Most kind of get mucked up in a
half-open/half-closed state, causing all sorts of interesting
acceleration/deceleration characteristics when you're driving normally, and
sometimes hard-starting. If you find it's all gummed up with small black
particles, unfortunately you have an older version of injector pump which
you'll need to get rebuilt, as the particles will keep appearing regularly
and spoiling your motoring day as the additives in the 2005 year diesel
start to eat away plastic/composite components within the pump which were
designed for the fuels of 1983.

The main solenoid itself likes to go intermittent before failing entirely,
and the best way to have a look at the operation of the thing is to take the
top cover off of the injector pump (3 screws) and apply 12V to the 'wide'
tab while grounding the cover. Sometimes the solder connections themselves
are intermittent (wiggle them) and sometimes the windings in the solenoid
coil themselves suck (look for discoloured patches in the coil windings.)

(CUCVs are great vehicles with a few irritating and recurring flaws. The
'black particle' thing was something well known to GM while the vehicles
were still in U.S. Army service, but apparently there was no 'recall'
program to deal with it.)



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