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Do I need another PMD or???

tystic

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Location
Indiana
New pensicola PMD and six foot cord and heat sink
New lift pump two years ago, varfied works and getting fuel at the purge on a filter that's four months*old. FueL at t-valve and truck runs with it open no air bubbles.
Air filter ok not perfect.
New injectors as march of this year.
New tuna can this year
New shift solenoid 12 &34 full synthic
Truck sat for two weeks.

Idies fine, just under acceleration the truck dies or sputters and bogs down and takes a while to come out of it (1500rpms).

Will run down the road at sixty no problem. Just no passing or same thing happens. Full tank of diesel from same place as always.

The ip silanoid is working when key is on. No codes being thrown stopped at Auto zone.*Vacuum on tne turbo and the silnode is working.

Truck run fine until two week ago when it died twice running down the road. Put ice on the PMD the frist time started up drove home, next day died and sat for a hour and ran fine.

Ok, sent the PMD back to pensicola, got a second one truck runs better. Kinda sorta now when it dies it'll start up again. Moved the PMD up be hide the grill like Hummer trucks did.

Yes spent time reading there forums too. Found a interesting thread over at the place last nite from way back when about 2000 rpm test. Tried it last nite after work, truck wouldn't maintain it go up 2300 and down to 1800 rpm.

Which on the thread said either ip or fuel filter or strainer. Lil light pops on 'lost with plugs' said that! But never caught the strainer part. So tomorrow I'm going to find the strainer.

There is a set of pics on here showing it and how too! But back to PMD ss diesel say" sometimes" you need to have the scan two tool to reteach or every fifty key turn the computer relearns the resistor.

Because we changed to the number nine resistor and no clue what's in the truck. The truck still stumbles or stalls around the above rpms under load. Above fifty five to seventy runs fine.

Tried this morning after fifty five to kick down got three thousand rpms and about seventy and truck stumble and coughed and I backed out two thousand rpms but wouldn't striaghten out so I back off to fifteen hundred and started over slow steady acceleration to sixty nine and twenty-one hundred rpms locked in with cruise control for ten miles home perfect running truck.

Turn into the neighborhood gave it all she had and died but start up after a few cranks.

Does the scan too at sears do all this truck needs as in reteach, timing..etc etc.

*Also run all the diesel out this week, so we have fresh diesel. Didn't seem to help.

They say to much off color fuel will cause the optical sensor to act up. *
 
Last edited by a moderator:
Welcome!!!

It seems that is a complex problem.

Do NOT EVER RUN THE DIESEL OUT thinking that it will have fresh diesel.
It will stir up all the crudz and the IP and PMD runs hot.

Anyway, in this type of situation, you have to test everything even if the part is new.
Lift Pump test is a must although it is fairly new.
Is there any code?
What new injectors did you put in?
Check all the electricals, etc.?

Better yet, go do the diagnostic check/action list!!
 
need a pressure guage to verify that you have fuel pressure when it is happening, easiest is long hose on the drain T and then taped to a wiper blade so you can see it. Careful not to pinch the hose when closing the hood. Even if you have good pressure you still have a last ditch filter screen in the FFM that could be clogged.
 
I'm with JMJnet on the multiple problems.
You got to verify fuel pressure at all times(A permanent fuel press gauge is the best)
You also have IP problems IMO,the nonresponsive go pedal at times is a sure sign.( i have the same problem with my 98, but only right after start up in the morning when cold,its worse in winter).Me thinks its a stiff moving stepper motor.
PMD's are known to fail without warning and some hick along for a long time and can cause all kinds of funny things.
 
Welcome to the site spend some time here http://www.thetruckstop.us/forum/forumdisplay.php?218-6.2-and-6.5-Technical-Reference-Library more specific in this thread for fuel delivery issues http://www.thetruckstop.us/forum/sh...t-Pumps-amp-OPS-operation-and-troubleshooting and also this thread on grounds http://www.thetruckstop.us/forum/showthread.php?17457-Grounds-what-are-they-amp-where-are-they

Could be PMD, or the IP, or the lift pump, or the gnds, or combination of some/all lets do some diagnostics 1st.

New pensicola PMD and six foot cord and heat sink
New lift pump two years ago, varfied works and getting fuel at the purge on a filter that's four months*old. FueL at t-valve and truck runs with it open no air bubbles.
Air filter ok not perfect.
New injectors as march of this year.
New tuna can this year
New shift solenoid 12 &34 full synthic
Truck sat for two weeks.

Idies fine, just under acceleration the truck dies or sputters and bogs down and takes a while to come out of it (1500rpms).

Will run down the road at sixty no problem. Just no passing or same thing happens. Full tank of diesel from same place as always.

The ip silanoid is working when key is on. No codes being thrown stopped at Auto zone.*Vacuum on tne turbo and the silnode is working.

Truck run fine until two week ago when it died twice running down the road. Put ice on the PMD the frist time started up drove home, next day died and sat for a hour and ran fine.

Ok, sent the PMD back to pensicola, got a second one truck runs better. Kinda sorta now when it dies it'll start up again. Moved the PMD up be hide the grill like Hummer trucks did.

Yes spent time reading there forums too. Found a interesting thread over at the place last nite from way back when about 2000 rpm test. Tried it last nite after work, truck wouldn't maintain it go up 2300 and down to 1800 rpm. This indicates worn IP or fuel solenoid on end IP but lets rule out all other things 1st that can be contributing factors

Which on the thread said either ip or fuel filter or strainer. Lil light pops on 'lost with plugs' said that! But never caught the strainer part. So tomorrow I'm going to find the strainer.

There is a set of pics on here showing it and how too!

But back to PMD ss diesel say" sometimes" you need to have the scan two tool to reteach or every fifty key turn the computer relearns the resistor. Best recommendation I can make through this, ignore SS diesel they are often more wrong than correct especially with PMD/FSD and IP diagnostics 99 truck is OBD-II series control & the IP resistor value is learned by KO/KO with APP to the floor (see info in the TRL I linked you to earlier start with all "sticky posts").

DO NOT DO THIS HOWEVER until you confirm the resistor is in the PMD/FSD, as you will continue to run with old resistor value stored in the PCM unless you command a KO/KO learn but if resistor is missing it will see missing resistor and not start at all. In spite of what "experts" at SSD say resistor value incorrect will not cause you to shutdown or run bad it is a calibration resistor used on a IP test stand when new or rebuilt to make sure delivered fuel from the IP meets Syanadyne's test specifications


Because we changed to the number nine resistor and no clue what's in the truck. The truck still stumbles or stalls around the above rpms under load. Above fifty five to seventy runs fine. Changing resistor now without KO/KO has no impact

Tried this morning after fifty five to kick down got three thousand rpms and about seventy and truck stumble and coughed and I backed out two thousand rpms but wouldn't striaghten out so I back off to fifteen hundred and started over slow steady acceleration to sixty nine and twenty-one hundred rpms locked in with cruise control for ten miles home perfect running truck. Loose or dirty gnd lug passenger side rear of head is a common cause of this

Turn into the neighborhood gave it all she had and died but start up after a few cranks. (See last on gnds)

Does the scan too at sears do all this truck needs as in reteach, timing..etc etc. Generally no, most times theirs is a reader only, depending on competency level of Sears they may have a bi-directional scanner, you'll need to find out and report back what kind of tool they have

*Also run all the diesel out this week, so we have fresh diesel. Didn't seem to help.

They say to much off color fuel will cause the optical sensor to act up. * What kind of fuel are you running ??? Off road ? Do you run an additive, some say "red fuel" will cause problems, I've run "red" in "emergency-situations" with no negative impact, more important is quality of fuel and knowing what else you may be putting in the fuel tank as an additive or economy extender i.e. waste oil or transmission fluid
 
Hello, ya I work slow at home. Bought the fuel gauge hooked to the t valve. Wanted to see if there be a difference before and after fuel filter change. Key on five psi, barely made it out of nieghibor hood stumble stall cough hack still four psi, four psi at thirty five mph. Looks as if i need to buy another lift pump. The connection on the 1993 lift pumps are different so i'll have to look at this to. So I pulled the fuel filter black as normal. Final got the little stainer out had use two picks careful to pull equally out. Stealer wanted thirty +and a on line provider wanted ten but want ten for mailing? Wow! So Monday i'll start the hunt to find one that I can feel comfortably about buying. Started cleaning grounds today hope this a start in the right direction. Lots of reading being done, I'll see if i can find a used fuel bowl and start a government project at work.
 
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