Hesitation/Stall/Missing

[vggibrb]

I just bought my 6.5. The previous owner had the injection pump replaced within the last year. The truck starts a little hard, but that is more due to low battery power i think then fuel problems, it seems to crank a little slow but if you tap the gas it starts right up.

However after the truck has been running for about an hour and 15 minutes it starts to have problems. On the highway it either feels like it is missing or it has no guts. and it lower speeds it just stalls out.

This sounds like classic PMD failure to me, but beeing a newby to the 6.5 I don't really know. It seems really odd that the PMD would go out so quickly. I was thinking that i would move the PMD out of the valley and into an area with increased air flow, do yall think this would help the problem?

The SAS light has been on intermittenly, I'm hopeing that i can get a code off of it this afternoon.

Could this be a sensor problem?

Thanks

_ben

[Chevylover]

If you got your PMD still directly mount at the IP it really sounds like the classic PMD failure. Look at Walt's Shop :
http://www.ssdieselsupply.com/categories.html

There you'll find everything you need.

Cu,
Sven

[3bals]

Yes, and be sure to read Walt's FAQs on the subject. I found out the hard way. The PMD has to be mounted to a good heatsync otherwise it will burn out in minutes.

Jody

[Turbo]

I had the same problems with my truck and replaced the PMD with new FSD and IP and it still did the same thing.It turned out I had a plugged fuel sock.I fixed the problem and it ran fine.Just something to check before buying all new parts you may not need.

[christja]

I had the same problems with my truck and replaced the PMD with new FSD and IP and it still did the same thing.It turned out I had a plugged fuel sock.I fixed the problem and it ran fine.Just something to check before buying all new parts you may not need.

When you say pulgged fuel sock...are you talking about the fuel filter, or is that something different?

[RckyMtNDeZL]

Fuel sock is in the tank, last I checked anyway. I dont think its the PMD at all, when MY pmd dumped, it would stall as soon as it hot operating temp...in the same 2 block radius everytime, then quickly restart. It got worse, it would stall and not start for 20-30 minutes. But I never had it feel sluggish at all, I went through 3 of em. Yours sounds more like trouble in the fuel line or filter plugged up. Maybe a small crack in the fuel line...its not unheard of.

[TedReminder]

Get the codes first and go from there. Could be a few things. Lift pump, oil pressure/lift pump switch, nasty fuel filter, fuel lines sucking air, etc.
Ted

[farmboy56]

All i have to say is i am so happy i got a 93 mechanical. I have heard so many problems with the electronic controlled fuel systems that i am thankful to just turn a screw for more power.:)

[vggibrb]

Went Down to advance last night, and got codes read.

according to their scanner it was a

"History DTC P0236" which according to them is a Turbo/Super Boost Sensor A, can somebody explain this for me?

it also through a "History DTC P1216" which is "fuel solenoid responce time too short. i assume this is the PMD?

-Ben

[RckyMtNDeZL]

Well you have codes now, a solenoid huh? Easy fix. I dont have my shop manual on me, I read it like the bible when I am at work...I believe that code is a solenoid failure. But like I say cant be 100% until I see my shop manual. Im sure one of the folks here has one....

[Turbo]

When you say pulgged fuel sock...are you talking about the fuel filter, or is that something different?

The fuel sock is in the tank.It was plugged bad enough that it caused all the same problems as a failed lift pump,IP,PMD.After many e-mails with Walt from SS diesel he narrowed it down to the fuel sock.He was a great help.

[vggibrb]

how do you acess the fuel sock?

[Turbo]

You would have to drop the fuel tank and remove the sending unit from the top of the tank.The fuel sock is on the end of the sending unit.

[6.5 on da bayou]

Fuel solenoid responce time too short. AKA code 35 on my 95 dually.

From what i understand, that fuel solenoid is inside the injection pump. the computer is seing a "flutter" with that solenoid that could be caused by the pmd, pmd harness, or that soleniod may be going bad which means the pump will need replacing.

Please dont think that a one year old pump is still definitly good.

[Chevylover]

Fuel solenoid responce time too short. AKA code 35 on my 95 dually.

From what i understand, that fuel solenoid is inside the injection pump. the computer is seing a "flutter" with that solenoid that could be caused by the pmd, pmd harness, or that soleniod may be going bad which means the pump will need replacing.

Please dont think that a one year old pump is still definitly good.


Code 35 on OBD 1 Diagnosis( ->95) with electronic IP or DTC P1216 on OBD 2 Diagnosis(96-> )means :

Fuel solenoid responce time too short -> fried PMD

Get a new one with cooler and the prob should be gone.


Cu,
Sven

[6.5 on da bayou]

Hey Sven,
How can you be so sure its the PMD and not the injection pump?
The PMD on my Dually is only 1 year old and it is mounted to the FSD Cooler already. The IP on my Dually is approx 4 years old.

[vggibrb]

I talked to the mechanic who replaced the IP for the previous owner. IT IS STILL UNDER WARENTEE :). I would cost me about a hundred bucks to have it tested, although the mechanic seems to think that it is quite unlikely that it is the PMD.

Coincidentally all of the cost is in removing and installing the pump, is this something that i can do myself, or is it worth it to bring it to the shop?

Anybody out there dropped the tank on a suburban before?

-thanks
Ben

[Chevylover]

Hey Sven,
How can you be so sure its the PMD and not the injection pump?
The PMD on my Dually is only 1 year old and it is mounted to the FSD Cooler already. The IP on my Dually is approx 4 years old.


I can't be sure to 100% but for 95%. Check if the srcews which attach to PMD to the cooler are fastend or loose. If they ar not really fastend the heat from the PMD could not go best to the cooler and after a time it will frie with the cooler also. Here in Germany we change the PMD if we get a Code 35 or 36. Try another PMD if you got the possibility to test.

Cu,
Sven

[6.5 on da bayou]

I can't be sure to 100% but for 95%. Check if the srcews which attach to PMD to the cooler are fastend or loose. If they ar not really fastend the heat from the PMD could not go best to the cooler and after a time it will frie with the cooler also. Here in Germany we change the PMD if we get a Code 35 or 36. Try another PMD if you got the possibility to test.

Cu,
Sven

Hey Sven,
I emailed Walt yesterday and he will test my PMD since its so new, before i buy an Injection Pump.

THANK GOD WE HAVE WALT :D

[sixnickel]

Ben We had the tank out of my sons burb a few weeks ago. No big deal unless it is full then you need a good jack or you will need to drain it. A full tank is about 400lbs. I used a transmission jack with about 8 gal. of fuel. The sender unplugs over the left rear wheel on the frame rail. Undo the fuel fill , unbolt the straps or the skid pan and drop it down about a foot. From the right side reach across the tank an undo the fuel lines ( good luck on rust! do what you got to do) and drop it down . 2 people make a lot easyer good luck.