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Thread: New to me M936A2 engine idle / load issues

  1. #21
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    Biodiesel sounds like an easy try. What causes it to clean things up. The fuel had a heavy varnish smell when I drained it. I smelled no hint of vegetable oil and I'm familiar with the smell of it as it goes bad. The varnish smell did have a slight sweet smell so I could buy into the sugar theory.

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    Careful with bio, it is highly corrosive and the early Cummins junk didn't like it, BUT, since it is corrosive, it might help! I agree, looks like water or something water based. There are other fuel system cleaners out there, I just have never seen them work, so if the FG part can't be located, try something else.
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  3. #23
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    I had a hard time finding the FG cummins cleaner so I was able to get some Penray Total Diesel Fuel System Cleaner off amazon and from what I read it is really good at cleaning up deposits, especially asphaltene. It seems to have helped. I dosed it pretty heavy in the tank and ran it for an hour at 1250 rpm then was able to drive it around my field for about 45 minutes and it was much better. Still will die at close to idle, but now that is like 650 rpm instead of 850 rpm. Also seems to recover from low rpm better. I will just continue running it as it is and hope that it continues to get better before I resort to biodiesel. I may mix up a small mechanic tank with a high dose of this penray and hook up at the lift pump and run that through to try and quicken things. What idle RPM do most people run? I see 575-650 in the TM.
    Last edited by dcowan; 10-09-2019 at 22:12.

  4. #24
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    Does it respond and run well with the power divider on? That is a load versus a just high idle
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
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    M931A2
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    M1078
    M796 Bolster
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  5. #25
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    Not really sure what you mean by power divider. At high idle it runs fine. It does not seem to handle load as well. For example in neutral transfer case in gear for the transmission with PTO locked in I can kill it at low idle very easy. Have to rev up over 1000RPM to not kill it.

  6. #26
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    Quote Originally Posted by dcowan View Post
    Not really sure what you mean by power divider. At high idle it runs fine. It does not seem to handle load as well. For example in neutral transfer case in gear for the transmission with PTO locked in I can kill it at low idle very easy. Have to rev up over 1000RPM to not kill it.
    When you place the transfer case to neutral. And engage the lever behind the seat, then place it in 1-5 it should automatically rev up 1650 rpms. The lever behind the seat is the power divider. That is for the transfer case pto only to engage the wrecker body and rear winch

    You should not have to toucb the throttle it should go up on its own.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    Big Dummy silverstate55's Avatar
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    Seafoam works wonders for me, especially on varnish-like coatings/deposits in fuel system. Available at any auto parts store and even some walmarts.

  8. #28
    Former SSG 98G's Avatar
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    Quote Originally Posted by simp5782 View Post
    When you place the transfer case to neutral. And engage the lever behind the seat, then place it in 1-5 it should automatically rev up 1650 rpms. The lever behind the seat is the power divider. That is for the transfer case pto only to engage the wrecker body and rear winch

    You should not have to toucb the throttle it should go up on its own.
    This directly conflicts with my experience.

    Here's what I experienced with operating the rear PTO on my M936A2 -

    Transmission in neutral.

    T-case in neutral.

    Engage the rear PTO.

    Transmission in 1-5. (Remains at idle).

    Immediatley adjust throttle for 1500+ rpms.

  9. #29
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    Quote Originally Posted by 98G View Post
    This directly conflicts with my experience.

    Here's what I experienced with operating the rear PTO on my M936A2 -

    Transmission in neutral.

    T-case in neutral.

    Engage the rear PTO.

    Transmission in 1-5. (Remains at idle).

    Immediatley adjust throttle for 1500+ rpms.
    Some have had the auto governor removed by the units They came factory with them to prevent burning the transmissionup. They had even added them to the 816s as well
    Attached Images Attached Images
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

  10. The Following User Says Thank You to simp5782 For This Useful Post:

    98G (10-12-2019)

  11. #30
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    Mine does not auto-throttle up. I have to manually adjust it with the hand throttle.

  12. The Following User Says Thank You to dcowan For This Useful Post:

    98G (10-13-2019)

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