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  1. #1
    Join Date
    Aug 2007
    Location
    Sacramento, California
    Posts
    169

    Default 6.5 shutting off while driving

    Need help:

    My Burb has started to shut itself off this morning while driving. Fires right back up though after I pull over.

    OK, I noticed lately that the Voltmeter is going down and once I did not get anything in the morning while trying to start it. Acted kind of "dead" with no movement or starter cranking sound. After trying to start a couple more times it finally fired. About a year ago, I had a similar problem with the Voltmeter going down and I barely made it home once. After taking the battery terminals off , they were very much full of the usual "goop". After cleaning the terminals, all was good again up until now.

    You guys think this could be the same problem? Should I start with trying to clean the battery terminals first? The batteries are not too old, I think they are holding the proper charge.

    Is this a possible PMD/FSD problem?

    Any help is appreciated. Thanks in advance.

    '96 Chevy Suburban LT 2500, 4x4, 6.5L Turbo Diesel, 4.10 Rear, 175K miles
    *** Towing 26' ft. Travel Trailer (6,165 lbs DRY) ***

    - aFe Stage 2 Performance Air Intake Kit
    - 4" inch Jerry Jardine, PINNACLE POWER EXHAUST, 5" inch Chrome Tip
    - 2-1/2" inch Crossover Pipe, mandrel bent
    - KENNEDY remote mounted PMD/FSD Cooler Package, DTech PMD
    - AUTOMETER Triple Gauge Pillar (Boost, EGT/Pyro, Trans. Temp.)
    - HEATH Turbo-Master
    - HEATH Max-E-Tork PCM
    - PRODIGY Brake Controller
    - BILSTEIN Shocks
    - Forged WELD RACING Rims
    - 265x75 R16 BF GOODRICH All-Terrain T/A's

  2. #2
    Join Date
    Feb 2004
    Location
    Zionsville, IN
    Posts
    574

    Default

    Start with the battery terminals, the alternator connections and all of the grounds - there are a number of them to check, clean, cover in dielectric grease and fasten tightly.
    Jeffrey Todd
    _ _ _ _ ___ _ _ _ _
    '96 6.5TD GMC Suburban 2500 4x4 - 300,000 miles, JK remote FSD, Dual Thermostats

  3. #3
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Start with your battery cables. If they haven't been replaced, you could be chasing a wild goose. Once replaced, verify all the grounds are in good shape, then look at the ignition switch for the problem (if the cable/ground workover doesn't do it).

    The PMD/FSD can cause the symptoms you describe, but it will have no effect on the way the starter cranks or voltages act. Voltage fluctuations can cause a lot of problems that mimic other failures. A bad ground and/or poor battery cables/connectors can cause the PCM to limp or fail.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  4. #4
    Join Date
    Aug 2007
    Location
    Sacramento, California
    Posts
    169

    Default

    Thank you all.

    Checked the battery terminals and cleaned everything thoroughly. The Voltmeter shows a lot more charge now, so I am hoping this was the problem.

    Anyone have a chart or a good describtion as to WHERE all the grounds are located?

    Battery cables look good to me.

    Thanks.

    '96 Chevy Suburban LT 2500, 4x4, 6.5L Turbo Diesel, 4.10 Rear, 175K miles
    *** Towing 26' ft. Travel Trailer (6,165 lbs DRY) ***

    - aFe Stage 2 Performance Air Intake Kit
    - 4" inch Jerry Jardine, PINNACLE POWER EXHAUST, 5" inch Chrome Tip
    - 2-1/2" inch Crossover Pipe, mandrel bent
    - KENNEDY remote mounted PMD/FSD Cooler Package, DTech PMD
    - AUTOMETER Triple Gauge Pillar (Boost, EGT/Pyro, Trans. Temp.)
    - HEATH Turbo-Master
    - HEATH Max-E-Tork PCM
    - PRODIGY Brake Controller
    - BILSTEIN Shocks
    - Forged WELD RACING Rims
    - 265x75 R16 BF GOODRICH All-Terrain T/A's

  5. #5
    Join Date
    Aug 2007
    Location
    Sacramento, California
    Posts
    169

    Default 6.5 shutting off while driving

    More help please, .................... she is still shutting off on me.

    Checked all battery connections and grounds (that I could find), can not find anything loose or not properly cleaned. Voltmeter still reads more than before, pretty much dead center on 14.
    The truck still shuts itself off while driving, fires right back up after stopping with no problem at all.

    Had it run in the driveway this afternoon for a while, suddenly shut off as well. Again, fired right back up and kept on running with no problems.

    While driving, I can not tell any issues until it shuts off. Once it fires back up, I drives as it should.

    I just changed the fuel filter no more than 400 miles ago, the alternator is about 1 1/2 years old.

    What else could it be? Should I take it to the dealer for a proper diagnoses? It scares me because what will I do if it shuts off while I am trying to pass someone or while pulling out on a busy intersection?

    Any help would be greatly appreciated.

    '96 Chevy Suburban LT 2500, 4x4, 6.5L Turbo Diesel, 4.10 Rear, 175K miles
    *** Towing 26' ft. Travel Trailer (6,165 lbs DRY) ***

    - aFe Stage 2 Performance Air Intake Kit
    - 4" inch Jerry Jardine, PINNACLE POWER EXHAUST, 5" inch Chrome Tip
    - 2-1/2" inch Crossover Pipe, mandrel bent
    - KENNEDY remote mounted PMD/FSD Cooler Package, DTech PMD
    - AUTOMETER Triple Gauge Pillar (Boost, EGT/Pyro, Trans. Temp.)
    - HEATH Turbo-Master
    - HEATH Max-E-Tork PCM
    - PRODIGY Brake Controller
    - BILSTEIN Shocks
    - Forged WELD RACING Rims
    - 265x75 R16 BF GOODRICH All-Terrain T/A's

  6. #6
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    Sounds like the infamous PMD creeping into your life.
    The optical sensor in the IP can do this but a PMD is very likely the culprit.
    The fuel lift pump and or the Oil pressure switch can do it.
    Make sure fuel will flow from the drain line on the filter even with the engine running. If not you have an issue.

    Check the fuel supply first and if thats ok move on to the PMD.

    Good luck


    Robyn
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  7. #7
    Join Date
    Aug 2007
    Location
    Sacramento, California
    Posts
    169

    Default 6.5 shutting off while driving

    Thanks Robyn.

    Ok, there is one thing I do not quite understand in regards to the fuel:

    - Why would it fire right back up with no issue at all if there was a problem with the fuel flow?

    If it is the PMD which on my truck I am sure is still stock, with what shall I replace it?
    Anyone has a picture of a "before" and "after" PMD installation, can I do this myself? Where exactly is it located?

    Thanks in advance.

    '96 Chevy Suburban LT 2500, 4x4, 6.5L Turbo Diesel, 4.10 Rear, 175K miles
    *** Towing 26' ft. Travel Trailer (6,165 lbs DRY) ***

    - aFe Stage 2 Performance Air Intake Kit
    - 4" inch Jerry Jardine, PINNACLE POWER EXHAUST, 5" inch Chrome Tip
    - 2-1/2" inch Crossover Pipe, mandrel bent
    - KENNEDY remote mounted PMD/FSD Cooler Package, DTech PMD
    - AUTOMETER Triple Gauge Pillar (Boost, EGT/Pyro, Trans. Temp.)
    - HEATH Turbo-Master
    - HEATH Max-E-Tork PCM
    - PRODIGY Brake Controller
    - BILSTEIN Shocks
    - Forged WELD RACING Rims
    - 265x75 R16 BF GOODRICH All-Terrain T/A's

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