From: Jim Newton (jnewton@laurel.com)
Date: Wed Jun 04 2003 - 00:09:23 PDT
First, what a fantastic group of people we have participating in this
list! Hats off to all of you! It feels like we have a big motor pool
hall that we can just mill into and shoot the breeze and get answers
to our pressing MV questions. How amazing!
OK...chill out, Ike! ;)
On my trip to LA this weekend, on the way back my "M1007" began to
hesitate at around 60 MPH. It didn't want to go faster than that
(probably OK since I had a stack of brand new deuce sideboards and
troop seats hanging out the back open cargo doors). If I was going up
an incline and I shifted down to 2nd Gear, the hesitation would occur
at the same general RPMs as when it was in D (Drive) at 60 MPH.
Usually this M1007 will step along quite nicely at literally 80 MPH
with plenty of punch left (thanks to the Banks turbo installed by the
previous owner on the brand new GM Goodwrench engine).
There was no overheating problem despite the 100+ outside air
temperature (OAT). It was running right at 215 to 220 degrees water
temperature on the stock gauge, well below the red zone (240 is in the
danger zone on this gauge). It typically runs between 200 and 220 on
this gauge (not like the deuce which NEVER breaks 180 even towing the
M1007 up a big hill). The EGT gauge reading was also quite normal.
At a rest stop I popped the air filter element out and tried running
without any filter, thinking maybe the air filter had become clogged,
but still got the same hesitation. Dirty air filter eliminated as a
cause.
This happened with two separate fuel tank depletions and refills, so I
do not suspect bad fuel.
The truck runs fine and fairly powerfully up until mid to high RPM.
It got decent gas mileage on the return trip (about 14 MPG) which is
normal for this vehicle.
Today I picked up a new fuel filter at NAPA (only about $16) but have
not installed and tested it yet to see if that solves the problem.
Has anyone experienced this type of problem? What was the solution?
o Dirty fuel filter? (If so, my purchase will solve the problem)
o Water in fuel? (would cause complete shutdown, not hesitation)
o Plugged injector(s)? (would be rough all the time)
o Turbo failing? (boost gauge read normal boost levels)
o Electrical problem?
I did notice lately (for the last 2 months or so) that when I would
round a bend or change lanes on the freeway, the motor would hesitate
a little bit. It startled me because it felt like I was letting off
on the gas. Now it is like that all the time at 60 MPH. Maybe this
will provide a clue to some sharp list member.
Thanks!
--Jim "Ike" Newton
o 1984 M1007 CUCV Military Suburban 6.2 Liter (378 CID) Turbo-Diesel Engine 5/4 Ton Cargo Capacity, 4WD
o 1971 M35A2 Military Troop/Cargo Truck "Deuce and a Half" 478 CID Turbo-Diesel Multi-Fuel Engine Air Shift Front Axle 2 1/2 Ton Cargo Capacity, 6WD
See These Trucks at www.CUCV.NET Keyword Searching of 22,000 Electronic TMs at www.MILDOCS.com
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