1996 6.5L Turbo
 

Does anyone know why engine might shut it self off while running or ideling, but some times will run fine? Also usually will not start again once it is warm?

I'm not sure. there are quite a few 6.5 guys here that know their stuff and hopefully they will chime in in a bit. i moved this to the 6.2 6.5 forum to help ya gain a little more exposure.

Could be the PMD. (Spam Removed)

Whats a PMD ?

Pump Mounted Driver. Also known as FSD. Its the little box that can be a pain in the butt!

Could be a bad electric lift pump on the frame rail but most likely the stated PMD.

Yes, as stated before, it sounds like a PMD (or some call it the FSD) failure. It could also, however, be something electrical...make sure you check your grounds...engine and chassis...or it could be related to fuel...make sure there's no leaks in all of your fuel lines, and as stated earlier, it could be your Lift Pump, or Oil Pressure Switch. The lift pump should be on the frame rail under the driver's seat...you should be able to hear, or at least feel, the pump running. If not, run a hot wire to it, and see if it comes on. If it does, then it's not the LP that's bad, it's your OPS. They are both common failures on the 6.5. The PMD is a small black box on the Drivers' Side of the Injector Pump. It is about the size of a deck of cards. In '94, GM went all electronic with their injector pumps. The PMD, because of it's location gets and stays too hot, and the diodes inside of it burn out, way before they're supposed to. If you simply replace the PMD in it's stock location, it is sure to fail within a year or 2. To fix the issue, most of us 6.5ers mount the PMD on a heat sink and somewhere outside of the engine compartment. Heath Diesel makes a pretty good one, and warrenties his for 7 years. Kennedy Diesel also sells one. I've never heard of one of his failing in that time period. Others (I, for one) decided to go a cheaper route and build our own heat sink, and only replace the PMD and get an extended wiring harness, also available from Heath or Kennedy.

If you take the truck to the dealer, chances are, they will diagnose it as a faulty injector pump, and charge you out the A$$ for a pump and install...save yourself some money and replace the PMD in a remote location...

I sent you a PM about another site to check out...it's FULL of 6.5 experience and information...

May also be a problem with the fuel injection pump. If there is an electrical problem witht he cold start system as soon as the engine is warm it may shut down or run rough. If the vehicle is being driven upon warm up when you come to a stop the engine may shut down. Another thing to think about is the fuel pick up tube in the tank being clogged. If this is clogged it will also cause the problems you are having.

....99 times out of 100...it's the PMD or OPS/Lift Pump on the 6.5 though...

Jimmy I had a 94 6.5 .2500

Did you try to read the codes?

Do that first it will tell ya whats going on.then you can get more help .....and find out for sure:)
It should be under your dash by your left knee. just put a wire or clamp in the two little hole on
the top, I think its the side by side two on the right of the square thing with all the little holes in it. lol (i dont know what the name of it is,, sorry..)
your "check engine" should flash... 1 2a few times then the next is your code,, 33 or 34 or whatever.. try that.

you just might have to unplug your battery wire and re plug it in also,, sometimes these trucks just have to be reset..

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Im sorry to be so vague..

But it looks like this,,,,
{_}F/E/D/C/B/A{_}
{_}G/H/J/K/L/M{_} <_<<<<<imagine a little box around that,,:)

ALDL is what is called, put your wire in A/B

good post Jenn, sounds like the PMD, you might need one of those PMD coolers, they are pretty effective, but the biggest thing is to check the ground on it, most of the time, its the ground and not the PMD.

If it is the PMD, then a PMD cooler is the ONLY way to go...get a remote mount extension from either kennedy diesel or heath diesel...and get it out of the engine bay. The PMD's worst nightmare is the extreme heat caused by being mounted in the valley of the engine...the only sure way to fix it is to get it away from the heat...

as stated, it could be a lift pump, or Oil Pressure Switch (OPS) To check the LP, see if it's running while the engine is running...if you listen closely, you should be able to hear, or at least feel it vibrating. If it's not running, it could be either one of the two. The OPS controlls power to the Lift Pump. Run a jumper wire to the LP...if it comes on, then the OPS is bad...if it doesn't, it's probable that it's the LP, or Both...

as said before...check for codes...jumper the "A" and "B" ports on the ALDL connector and post your results

OBD2 is your best bet. What jimmy said works for 95 and below. Go with heath. Everything is warranty for 7 years!:U:

PMD has PMS.............
 

I also have the same problem with my 96 6.5.......new fsd/pmd coming monday. I will put mine in monday pm.......it better work ....I've changed lift pump, fuel shutoff solenoid, crankshft sensor, .....Sooner or later I'm going to get to the right part.....:humm:

Did you get the remote mount kit?

Broken 6.5L TD
 

It ur PMD (the plastic thing mounted on the side of the injector pump). Same thing happened to mine and to everybody i know who owns one. they sell a pmd isolator to stop that from happening again.
=

I am having a problem with the stalling but it runs fine otherwise. it will skip or stall but start right back up. any help would be great. I have been told either bad fuel or injector pump. I have refilled tank 25 gallons and appears to have same problem.
tks dave

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thanks any idea where i order one from ? I called my mack- diesel parts and they had no clue what it is.

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any idea where i can order a pmd?

My truck's doing this same thing. It just cuts out at random times, doesn't seem to matter if it's during acceleration, deceleration, braking, whatever. It just seems to do it randomly. I'm thinking it's the PMD. Is there some way to test it before I go out and spend 550 bucks on one? Oh, by the way, it's a 94 k2500 with the 6.5 turbo

Heath Diesel sells the best solution out there, GM/Stanadyne screwed the pooch with on IP location of the driver. Any location under hood is bad, period. Even if this isn't your issue, but this sounds like classic PMD issue your truck will be better for it.