Howdy Guys, long time lurker but first time poster. Thanks for having such a great forum for 6.5 owners, it was part of the reason I own one. Now to my problem.
I have a 1995 2500 6.5T that I bought about 5 months ago. Great condition with 100k miles on it, all stock except for a Banks exhaust. It has always run great, started easy with barely any smoke, ran smooth with no smoke and never had much blowby. The prior owner put a new injector pump on it at 99k, I have the receipts to prove it. I bought a new D-Tech PMD and put it in the front bumper with a 12 volt fan/heatsink on it, and left working PMD on the pump for backup, (didn't want to have to take the intake manifold off). I also hot wired the lift pump to a 12v ignition source in the cab because the OPS was out, (PO had been driving it that way not realizing it wasn't working, and it didn't really change how the truck ran once I got it hooked up).
So the other day I was driving at highway speeds and got two fishbites/hiccups in the space of about 5 mins. Has never happened before. I also notice that the throttle pedal seemed a little unresponsive, I had to tap a couple times to get it to respond during that trip.
Later in the day I am leaving home and the power just drops off and the truck dies, cranks good/fires but wont hardly idle, and throttle is very unresponsive, (I cant give it enough fuel to keep it going), chugs hard and blows black and white smoke/misses about half the time.
I roll half a mile back to the house backwards on a dead stick, (thank goodness we live in the bottom of the canyon).
The way it died suddenly seemed to indicate PMD/electrical problems, so I cleaned all the grounds I could get to (Six?) and battery terminals, swapped to the known working PMD on the pump and removed filter harness from optical sensor. No change.
Checked fuel pressure at the T drain valve: about 4.5 PSI idle and 3PSI at 2000 rpm (running rougher than a cob though so who knows), plenty of volume.
Pulled fuel line at top of the IP and found air in the line. Pulled the fuel filter housing: filter(about 5k miles old) and tiny screen are clear, normal amount of junk in bottom of housing. Replaced fuel lines that go to drain valve and injector pump, replaced the O rings at the heater assembly and WIF sensor. Cut a fresh end on the supply line coming from tank, (but didn't replace whole line), and tightened fittings at the LP. Checked for air again and it seemed to be cleared up.
Bled 6 injectors, (couldn't get to the two under the turbo, the one against the firewall passenger side the exciting enough with the truck running and a bare turbo).
Idled the truck for 15 mins or so and it seems to nearly be cleared up, will almost idle smooth and rev smooth, but occasionally still misses/bites a bit, especially at higher RPS. It is doing it enough that I don't trust to drive it. Sometimes it will idle smooth for 30-60 seconds only to miss/chug and belch a big cloud of black smoke.
Could it still be working air out of the system? Could it be a sticking injector that was brought on by the air issue? (It is probably due for them, at 111k miles and I have no proof they aren't originals so they probably are).
I am planning on running it a while longer and bleeding the injectors again and seeing if it clears up 100%. I really don't want to have to remove the turbo to get the last two injectors, but if the consensus is there I spose I will have to. Or maybe I have another issue as well (coolant temp sensor, optic sensor, some mystery gremlin).
Any advice, sage or otherwise, would be greatly appreciated.
I have a 1995 2500 6.5T that I bought about 5 months ago. Great condition with 100k miles on it, all stock except for a Banks exhaust. It has always run great, started easy with barely any smoke, ran smooth with no smoke and never had much blowby. The prior owner put a new injector pump on it at 99k, I have the receipts to prove it. I bought a new D-Tech PMD and put it in the front bumper with a 12 volt fan/heatsink on it, and left working PMD on the pump for backup, (didn't want to have to take the intake manifold off). I also hot wired the lift pump to a 12v ignition source in the cab because the OPS was out, (PO had been driving it that way not realizing it wasn't working, and it didn't really change how the truck ran once I got it hooked up).
So the other day I was driving at highway speeds and got two fishbites/hiccups in the space of about 5 mins. Has never happened before. I also notice that the throttle pedal seemed a little unresponsive, I had to tap a couple times to get it to respond during that trip.
Later in the day I am leaving home and the power just drops off and the truck dies, cranks good/fires but wont hardly idle, and throttle is very unresponsive, (I cant give it enough fuel to keep it going), chugs hard and blows black and white smoke/misses about half the time.
I roll half a mile back to the house backwards on a dead stick, (thank goodness we live in the bottom of the canyon).
The way it died suddenly seemed to indicate PMD/electrical problems, so I cleaned all the grounds I could get to (Six?) and battery terminals, swapped to the known working PMD on the pump and removed filter harness from optical sensor. No change.
Checked fuel pressure at the T drain valve: about 4.5 PSI idle and 3PSI at 2000 rpm (running rougher than a cob though so who knows), plenty of volume.
Pulled fuel line at top of the IP and found air in the line. Pulled the fuel filter housing: filter(about 5k miles old) and tiny screen are clear, normal amount of junk in bottom of housing. Replaced fuel lines that go to drain valve and injector pump, replaced the O rings at the heater assembly and WIF sensor. Cut a fresh end on the supply line coming from tank, (but didn't replace whole line), and tightened fittings at the LP. Checked for air again and it seemed to be cleared up.
Bled 6 injectors, (couldn't get to the two under the turbo, the one against the firewall passenger side the exciting enough with the truck running and a bare turbo).
Idled the truck for 15 mins or so and it seems to nearly be cleared up, will almost idle smooth and rev smooth, but occasionally still misses/bites a bit, especially at higher RPS. It is doing it enough that I don't trust to drive it. Sometimes it will idle smooth for 30-60 seconds only to miss/chug and belch a big cloud of black smoke.
Could it still be working air out of the system? Could it be a sticking injector that was brought on by the air issue? (It is probably due for them, at 111k miles and I have no proof they aren't originals so they probably are).
I am planning on running it a while longer and bleeding the injectors again and seeing if it clears up 100%. I really don't want to have to remove the turbo to get the last two injectors, but if the consensus is there I spose I will have to. Or maybe I have another issue as well (coolant temp sensor, optic sensor, some mystery gremlin).
Any advice, sage or otherwise, would be greatly appreciated.
