94 6.5 diesel K3500 died going down the road. Will not restart. It died like PMD - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 12-22-2013, 12:56 AM   #1 (permalink)
jrsavoie
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94 6.5 diesel K3500 died going down the road. Will not restart. It died like PMD

94 6.5 diesel K3500 died going down the road. Will not restart.

It died like it was a PMD issue. But never restarted like a PMD normally would.

Lift pump is working good.

The fuel shut off solenoid is working

Fuel filter is changed. Looked dirty but it still had good flow from the T/drain valve and the filter bleeder.

The injector pump return line did not seem like it had as much flow as it should,
Is it possible to back flow into the IP?

The PMD's are good. I tried different "known to be good PMD's and extension harnesses. No change = no start.

It is obviously NOT getting fuel. No smoke, no nothing.

The glow plugs are cycling normally.

I used to have a sheet on how to test the PMD. I seem to have lost it. Does anybody have a good checklist for the PMD?

I am going to double check the Injection Pump return line tomorrow.

Any other thoughts would be enormously appreciated.

Checked grounds and fuses - all good

If anybody is interested, I would pay for a house call. Near L'Erable, Illinois

I'm stumped

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95 Tahoe 2 door 4x4 6.5 200,000 mi; Fluidamper, Amsoil bypass filter, remote PMD, K47 air filter
1989 GMC Sierra 2500 2wd 5 spd get-rag trans had 108,000 mi. in 92 when the odometer broke. 6-800,000 miles on the truck. Installed a GM crate 6.5 non-turbo in 2000 about 300,000 miles on the motor, original IP
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Old 12-22-2013, 11:25 AM   #2 (permalink)
racer55
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The PMD diagnostic is here:
www.AccurateDiesel.com - PMD Installation Instructions - Accurate Technical Services, LLC

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Old 12-22-2013, 11:31 AM   #3 (permalink)
Diaric
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My post didn't come trough last night.

Did you check any ignition fuses to see if by some fluke, that was the issue?

I looked in the FAQ's for a diagnostic and there wasn't one, so I will add this. Thanks Racer
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well to make your pump retarded, you could let it hang out with me for a day
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Old 12-22-2013, 11:38 AM   #4 (permalink)
Freddyack
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Plugged fuel return line will shut down the IP
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Old 12-22-2013, 12:32 PM   #5 (permalink)
Bison
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Failed FSOS maybe?
Check engine harnas and connectors back at the fire wall.
Do you still have the OS filter in there? if yes ,remove it and plug the wire conector back in the OS and try start.
Also try starting with the CTS disconnected.
Check for power at the FSOS leads.
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Old 12-22-2013, 01:27 PM   #6 (permalink)
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IP return line is open and flowing. No start with the line disconnected and plenty of fuel coming out the return line.

I haven't checked the OS Filter yet. I think it was removed previously

There is absolutely no smoke at the pipe when cranking.

The glow plug light is coming on and everything seems normal til it doesn't start. There have been no previous indications that the truck may be coming down with the flu.

Redoing grounds again now and adding the extra ground wires that I always add. I add grounds from the battery to the battery box to compensate for the cheesy ground that attaches to the passenger fender.
I also add a ground to the frame at the spot by the starter and a ground directly to the stud by the firewall. I've seen that stud lose ground before - several times. Having a ground to that stud directly from the battery eliminates that possibility.
Can't believe I never added the grounds to this vehicle yet.
I also add a ground from the heater blower to the dash bolt inches away. I did that one when I changed the blower.

Does anybody have a link to checking for codes on OBD1 - 1994? It's been so long since I had to do anything like that, that I've forgotten how. IIRC it's a series of flashes and you count the flashes.
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98 GMC Suburban 2500 6.5 4x4 160,000 mi, Fluidamper, remote PMD, FS2500
96 GMC 6.5 Suburban 1500 4x4 200,000 mi; Fluidamper, remote PMD, Amsoil bypass, K47 air filter
95 Tahoe 2 door 4x4 6.5 200,000 mi; Fluidamper, Amsoil bypass filter, remote PMD, K47 air filter
1989 GMC Sierra 2500 2wd 5 spd get-rag trans had 108,000 mi. in 92 when the odometer broke. 6-800,000 miles on the truck. Installed a GM crate 6.5 non-turbo in 2000 about 300,000 miles on the motor, original IP
95 Chevy 2500 xtra-cab 2wd 6.5 190,000 miles,
91 international 4700 low pro, spicer 6 speed, DTA 360 with 18' van box 500,000 miles plus.
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Vote Freedom First
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Old 12-22-2013, 01:45 PM   #7 (permalink)
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Quote:
Originally Posted by jrsavoie View Post
IPDoes anybody have a link to checking for codes on OBD1 - 1994? It's been so long since I had to do anything like that, that I've forgotten how. IIRC it's a series of flashes and you count the flashes.
everything is in the FAQ's

https://www.dieselplace.com/forum/63-...des-obd-i.html
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well to make your pump retarded, you could let it hang out with me for a day
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Diaric wins thread derailment......
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Originally Posted by High Sierra 2500 View Post
Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
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Old 12-22-2013, 02:34 PM   #8 (permalink)
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Jeff my laptop that has GMTD scan on it lost the LED screen this week or I would be able to help...sorry.

A few suggestions that I'm sure you already thought of:
Timing chain? Did you remove the FOS plunger? Maybe add an additional ground to the PMD cooler plate?
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Old 12-22-2013, 03:13 PM   #9 (permalink)
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Try opening the fuel cap. Do you have a lot of vacuum? If so that could be contributing to the fuel flow problem.
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Old 12-22-2013, 03:25 PM   #10 (permalink)
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Break an injector line loose and see if there's fuel getting to the injector. With a good PMD, no OS filter and fuel flow out the IP return line while cranking but none to the injectors that's a pretty good indicator the IP has gone belly up. A remote possibility is a bad Crank Position Sensor but the truck should still run... poorly. ~FH

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