Question about 1990 Ford Mustang

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Won't run with the correct firing order

I have a 1990 Mustang 5.0 and I'm having problems with the firing order. in the internet it gives me 1 3 7 2 6 5 4 8. but will not run smooth, backfires through exhaust and intake. I used the old ford firing order 1 5 4 2 6 3 7 8 and the vehicle runs better but still misses and has LOW power. can anyone help I am confused.. Have put in new map sensor and engine computer again please please help..car is stop no modifications

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  • Anonymous Mar 18, 2014

    motor want idle and run bad

  • Anonymous Mar 28, 2014

    cylinder 5 location

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3 Answers

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Hi the firing order for a 5.0-302 is 15426378 and the fireing order for a 351is 13726548 save to file and zoom in
won't run with the correct firing order - c0b569d.jpg

Posted on Feb 06, 2009

  • Raymond l Vincent Jr
    Raymond l Vincent Jr Feb 06, 2009

    this goes with the pic

    the rotation for a 5.0 is clockwise

    the rotation for 351 is counterclockwise

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The firing order for that year should be the 13726548 counter clockwise. And the cylinders are right bank (passenger side) 1,2,3,4 and left bank drivers side 5,6,7,8.

Posted on Feb 06, 2009

  • Chuck Martin
    Chuck Martin Feb 06, 2009

    That is if it is an HO motor. And if I remember correctly that was the only one in a fox body mustang.

    But if it is Not an HO motor then it is the 15426378 firing order.

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It is the first firing order, are you going counterclockwise?

Posted on Feb 06, 2009

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bcd56b8.jpg


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