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Truck Hard to start when cold

Discussion in '6.9L IH & 7.3L IDI Diesels' started by ISPKI, Mar 27, 2020.

  1. Dane Rickford

    Dane Rickford Full Access Member

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    IMO, it’s always best to buy new anyhow LOL I hope that the new starter solves the issue for you
     
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  2. Tacoma_IDI

    Tacoma_IDI Registered User

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    Replies above are good. The only thing I would add is be systematic and methodical about troubleshooting or you’ll run down a half dozen different paths.

    I’d start with electrical. Batteries and cables first. Starter next. Jump start the truck and see if you get better results. Battery testing under load is free at most auto parts stores. Inspect cables and pay close attention to cable ends. Starter bench testing is difficult without the compression load so may need to replace.

    While all this is going on, a $10 drip pan is a great start to locating fuel leaks. A fuel leak, as you indicated will show an air intrusion leak. The most common fuel leak that is more difficult to detect is fuel pooling in the valley pan. This is usually from the low pressure inlet line on the injection pump.

    Good luck
     
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  3. u2slow

    u2slow Plan B

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    Air intrusion on the suction side may not visibly leak fuel. Or only look like residual 'wet' grime. All it takes is a pinhole to let fuel drain back and pull in a big slug of air overnight, or over a couple days.
     
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  4. Desertfireguy

    Desertfireguy Full Access Member

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    Really sounds like air intrusion to me. Happened last time I changed the fuel filter and was a simple fix solved by a little extra grunting while tightening the filter. Sometimes, if your bowl has a petcock at the bottom, loosening and then tightening it back up helps too, plus will purge any water that may be in there.
     
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  5. ISPKI

    ISPKI Welding/metallurgical engineer/Metalsmith

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    Thanks for the advice guys. The batteries load test ok but my cables were is shoddy shape. They are still original the jackets are hard as a rock and split open at the ends and the copper is crusty undeath. So yesterday I got my new DB high York starter, installed that along with a new trigger wire from the solenoid and a new positive cable from both batteries to the starter. Positive cable is 4/0 superflex welding cable, solenoid wire is an 8 ga ancor marine wire. Going to juice the truck up and see how it goes.

    I did notice that the fuel had drained out of the fuel filter head to some extent. I will get a picture of it but the short section of inlet hose to the filter head has no fuel in it. There must be a leak somewhere.
     
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  6. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    This will be a good start.
     
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  7. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    No pun intended unless you want it to be. Then it was.:joker:
     
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  8. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Ok. I have to admit that I didn't think about this until I made the first post.
     
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  9. ISPKI

    ISPKI Welding/metallurgical engineer/Metalsmith

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    IMG_20200404_182851225.jpg
    So here is the backflow prevention valve that I installed when I installed the fuel pump. Fuel is clearly leaking out of the system somewhere
     
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