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Dead 1998 K1500

matuva

matuva

Tropical 6.5er
Messages
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Location
New Caledonia. An island in south west pacific, cl
Guys, I feel a bit lost.

Recently, a 1998 K1500 just died while she was pulling a trailer with a boat.

She just die, and never restart till today.

I hooked my laptop with AE soft and found no codes.

Maintenance on that truck is poor, and I discover the lift pump was bad, and changed it.
Fuel filter was clogged, and fuel filter manager was full of crap. Even the small mesh plastic filter was missing.

I put on a new filter after I clean carefully the filter manager.

Plenty of fuel is now available at the T-valve, and up to the IP.

The fuel shut off solenoid clicks strong when keying on, no fuses are blown (ECM-B, ESO, etc...)

Disconnected the optic sensor;

tried another certified working PMD (the one from my own truck)


The result of all above is still no start and no smoke at exhaust. Crack injectors : no fuel or such a very few...

Put 2 new batteries after we killed the first ones. The engine cranck and spins strong, but not even a cough or smoke at exhaust. Obviously, it gets no fuel at the injectors.

Unfortunately, I have no spare PCM to try a swap, and one thing i haven't checked yet is the cranck position sensor.

I do believe the IP is shot, but I'm sure 95%...

What's your opinion ?
 
Is there any fuel coming out of the return line at the ip with the lift pump running? ECMs do just up and die. I've had it happen.
 
Turbine Doc said:
last ditch screen on the IP inlet/transfer pressure regulator ?
Click to expand...

where's that regulator Tim ?

bk95td said:
Is there any fuel coming out of the return line at the ip with the lift pump running? ECMs do just up and die. I've had it happen.
Click to expand...

I will check twice, but I remember seeing fuel at that hose

Chevylover said:
IIRC disconnecting the optic sensor will let no fuel out of the IP to the injectors, right ?

Cu,
Sven
Click to expand...
It usually allows you to run in limp mode. When you experience no start condition and succeed in starting after disconnecting the optic sensor, that shows the optic sensor is shot.


Hopefully I should have a 1997 PCM (and truck ) available saturday. I wonder if I can connect the 98 PCM to the 97 truck to see if it works ?
 
The screen he is talking about requires you to remove the inlet fitting on the IP and then remove the bib nut under it. (you need a thin wall socket) Then when you pullout the IP pressure regulator there is a screen on the unit, it pulls down gently by a slight back and forth motion, clean this, give the Allen screw in the center a one quarter turn (don't ask) and re install.

You can also use a spray bottle of diesel fuel and hit the intake with fuel to see if the motor will run, if it does start then die you know the mechanical is good,
 
Turbine Doc said:
last ditch screen on the IP inlet/transfer pressure regulator ?
Click to expand...

Tim, the one on the old IP was clean.

We put a new IP on the truck this week-end.

This afternoon, finished to put everything back and we tried to start the engine. Still no start, no smoke, no fuel at injector.

The IP is fresh rebuilt straight from Dipaco, new extension, new PMD

The owner remember he was stuck in sand beach.
The truck quit and die just after he switch on 4X4, and then never restart till today.
Does that tell you something ? PCM may be ?
 
Last edited:
Long shot, but could be glow plugs maybe?
Your discription says it died so most likely not GPs, but if they actually shut it down and engine cooled off if might be.
Good luck.
 
With the new IP are you getting any new codes? Are you able to verify you actually connect to the PCM with the scanner and get other data? If so I wouldnt think the PCM is the issue.

Make sure the IP harness is connected, the one before the PMD harness. And that that ground is still good.

Time to pull out the multimeter and check some PMD signals. Verify the power is actually there with the Ignition on, thats pin D. Pin F should be ground. Check that at pin C is a ground (that goes back to the PCM to determine closure). Then probe pin A while cranking and there needs to be at least 1.2V there, this is the fuel inject signal from the PCM.
 
I would be looking over the main wiring harness that fits under the intake manifold and feeds all the sensors and the IP.

Two large plugs at the rear of the engine. You may have a bad connection in one of these plugs.

A bad crank sensor will not cause a no start but the computer will complain bitterly.

The ECM goes to cripple mode and sets timing to a nominal value.

This issue has to be electrical.

Be real sure that the two grounds on the wiring harness at the rear of the engine (small wires) are intact and making good connection.

Having the optical sensor unhooked also will not cause a no start but just cripple mode.

The issue has got to be a loss of power somewhere or a bad ground.

Check to be sure that the wiring harness has not been damaged where it enters the body (Computer harness)


Keep us posted


Missy
 
Al

The PCM is last thing I'd suspect they are pretty robust, is shutdown solenoid on top of IP opening with key on ? you should feel a pretty good thunk as it pops open, also should be 12v at the plug.
 
Tim,

yes, the ESO is clicking strong when keying on, but I didn't check yet if it received +12 volts or less.

Tomorrow I'll hook the scanner to see what I get, and I'll post pics of the PCM harness at the PCM connectors : I remember I saw a kind of jumper in the harness, and I wonder who made that for what...

I can't understand yet why it did shut off as the owner was just pushing the 4x4 button to actuate the front end, don't understand what is the link between no start and 4x4 engage.... I hate electrical gremlins.

It just look like a kind of "security" somewhere is engaged : the pump is receiving fuel, and doesn't dispatch it then, injectors are dry.
My father in law is wondering about the pedal accelerator assy, what do you think of it ?
 
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