Isuzu 2.5 diesel start when cold but not when hot





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  1. #1
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    Default Isuzu 2.5 diesel start when cold but not when hot

    Itís about 7years old . Started sometime ago intermittently but now more than not. Any advice please thats why I dont post just on Isuzu section.
    Thanks

  2. #2
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    Default Re: Isuzu 2.5 diesel start when cold but not when hot

    Two options come to mind:

    You have a air entering the fuel delivery system, probably at the filter or between the tank and the filter.

    Alternatively, the tolerances on the lift pump are bad and get worse when hot.

    The injection system is a Bosch clone, so any Bosch Diesel workshop will be able to do a simple injection pressure and pump pressure test.

    DISCLAIMER: I do not own a Isuzu with a 4J series engine, I am not a mechanic and I actually have no idea what I am talking about.
    2012 Jeep Sahara Unlimited 3.6 V6
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  4. #3
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    Default Re: Isuzu 2.5 diesel start when cold but not when hot

    Quote Originally Posted by Anjo View Post
    Itís about 7years old . Started sometime ago intermittently but now more than not. Any advice please thats why I dont post just on Isuzu section.
    Thanks
    Does it crank fast enough when hot?, if not it could be battery or starter related .
    2003 Jeep KJ 2.5 CRD

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  6. #4
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    Default Re: Isuzu 2.5 diesel start when cold but not when hot

    Quote Originally Posted by Zoutpansberg View Post
    Does it crank fast enough when hot?, if not it could be battery or starter related .
    a duff battery won't be any better when cold
    2012 Jeep Sahara Unlimited 3.6 V6
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  7. #5
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    Default Re: Isuzu 2.5 diesel start when cold but not when hot

    Will. keep you update

  8. #6
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    Default Re: Isuzu 2.5 diesel start when cold but not when hot

    Quote Originally Posted by jelo View Post
    a duff battery won't be any better when cold
    my ford WL 2.5 did this, starts on the touch in the mornings, or when parked at work the whole day.
    but when i pop to the shop of do quick stops it cranks quite a few more times and slower.

    fitted new battery and problem solved. guessing that as cylinders expand in heated state compression is maintained better?

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