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Thread: how to turn up fuel...in pictures?

  1. #181
    Private yagenrok636's Avatar
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    Quote Originally Posted by rebelcummins View Post
    just be advised if you turn the fuel up too far the FDC will do strange things to the engine like, stuttering shuttering missing popping through the exhaust bad fuel mileage loss of power extreme amount of black smoke and high EGT's at least this happen to me not saying it would happen to you. I also do know this from experience if the FDC is still attached and working when you turn it up and if you start using waste oil for some reason it counteracts with that system and it doesn't run properly when. Now, when I bypassed it runs good and doesn't stutter doesn't miss runs excellent but I still have an issue of running straight diesel fuel, not sure why that is but that is one of the issues I'm still having. I can only run waste oil without the FDC and can only run diesel fuel with the FDC as long as its not turned up....
    I'm experiencing all of these things. Exhaust pops weird. Lots of black smoke at idle. Truck takes a long time to start on a 70 degree day. I only by-passed the FDC and didn't adjust the fuel at all. I went down 10 flats on the fuel, and it still has a really hard time starting, pops out the exhaust, runs really hot (1200 degree EGT) and acts like it has no power with 10 psi.
    Fortune favors the bold.

  2. #182
    4 Star General RAYZER's Avatar
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    Quote Originally Posted by yagenrok636 View Post
    I'm experiencing all of these things. Exhaust pops weird. Lots of black smoke at idle. Truck takes a long time to start on a 70 degree day. I only by-passed the FDC and didn't adjust the fuel at all. I went down 10 flats on the fuel, and it still has a really hard time starting, pops out the exhaust, runs really hot (1200 degree EGT) and acts like it has no power with 10 psi.
    Have you had your injectors pop tested? They may be worn out and leaking.
    Ray


    1986 m105
    1968 m146 RV conversion https://www.steelsoldiers.com/showth...-RV-Conversion
    1968 m35a2 road tractor https://www.steelsoldiers.com/showth...tor-conversion
    1963 m246a1 (mack)
    M373 Van trailer

  3. #183
    4 Star General frank8003's Avatar
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    put everything back like it was and see what happens.......................
    I was here, had a good time.

  4. #184
    4 Star General RAYZER's Avatar
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    Quote Originally Posted by yagenrok636 View Post
    I'm experiencing all of these things. Exhaust pops weird. Lots of black smoke at idle. Truck takes a long time to start on a 70 degree day. I only by-passed the FDC and didn't adjust the fuel at all. I went down 10 flats on the fuel, and it still has a really hard time starting, pops out the exhaust, runs really hot (1200 degree EGT) and acts like it has no power with 10 psi.
    Were you able to resolve this issue?
    Ray


    1986 m105
    1968 m146 RV conversion https://www.steelsoldiers.com/showth...-RV-Conversion
    1968 m35a2 road tractor https://www.steelsoldiers.com/showth...tor-conversion
    1963 m246a1 (mack)
    M373 Van trailer

  5. #185
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    I did the 50 cent trick or "quarter crap" on my 1971 M35A2 with C turbo, and saw a noticible improvement in power. When I upgraded to 11-20 tires I stacked another quarter for a total of 3 in the fdc. I am pleased with the improvements in power, streetability, turbo spool sound, hill climbing improvement, overall driveability, and it has been about 2 years. Maybe turning up the fuel in other ways and bypassing the fdc would give even better results. What I can say is it worked for me and thats "my 75 cents".
    Shane

  6. The Following 2 Users Say Thank You to Shane 1971 M35A2 For This Useful Post:

    cucvmule (10-02-2019), USAFSS-ColdWarrior (10-02-2019)

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