i6 300 problems.

Discussion in 'Other Automotive Tech & Talk' started by howecomav, Sep 28, 2012.

  1. howecomav

    howecomav Member

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    74 4 door comet getting ready to install 351W in place of 250 i6 spun bearing. And a 74 mav with 302
    my truck was running great when pulling trailer home the other day than ever since it has been getting weaker and weaker till it couldnt pull its own weight any more. Then we decided to advance the timing and started it and ran great a second backfired hard enough to shake the windows on surounding houses and continues to only back fire when trying to start it in every timing position. What could be wrong
     
    howecomav, Sep 28, 2012
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  2. Mavman72

    Mavman72 Gone backwards but lookin' forward

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    Sounds like...Timeing or fuel delivery issue...
     
    Mavman72, Sep 28, 2012
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  3. simple man

    simple man Member

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    The timing chain went in my 81 van with a 300. Mine didn't start getting weaker and weaker, it just got real weak all of a sudden! :)
    If you have a crapalitic converter, it may have clogged.
    I have to amend this post. The timing gear went bad! It's been a few years. :)
     
    Last edited: Sep 29, 2012
    simple man, Sep 29, 2012
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  4. rthomas771

    rthomas771 Member

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    Ethanol in the gasoline is causing a lot of problems
     
    rthomas771, Sep 29, 2012
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  5. simple man

    simple man Member

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    X2 (y)
     
    simple man, Sep 29, 2012
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  6. rwbrooks50

    rwbrooks50 Member Supporting Member

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    rwbrooks50, Sep 29, 2012
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  7. simple man

    simple man Member

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    Could you post up what year the engine is? Knowing if it's a carb or EFI will help. :)
    I also remember on my 81 van, the electronic module going bad. I was driving about 50mph and it was just like you turned the key off. A split second later a jerk Boom and then no more run. It backfired so bad, it split the muffler wide open! :)
     
    Last edited: Sep 29, 2012
    simple man, Sep 29, 2012
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  8. simple man

    simple man Member

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    Surely true! If it has any age on it at all, I'd change it regardless! :)
     
    simple man, Sep 29, 2012
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  9. howecomav

    howecomav Member

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    74 4 door comet getting ready to install 351W in place of 250 i6 spun bearing. And a 74 mav with 302
    yeah its an 87 efi. The period of time for getting weaker was about an hour and a half.
     
    howecomav, Oct 3, 2012
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  10. Fordmaster169

    Fordmaster169 Member

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    Check the coil, they are bad for internal arching. Look in between the windings and the laminated metal, if it is bad you will see arching marks. I have changed a lot of them.
     
    Fordmaster169, Oct 3, 2012
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