Need Help With Mustang Just Dieing .

Discussion in 'Fox 5.0 Mustang Tech' started by h mabry, Apr 24, 2014.


  1. h mabry

    h mabry New Member

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    not all the time , but just when ever it feels like it and some times back to back it just drops off. I can just shut the key off and right back on and it starts up like nothing ever happen . Til it feels like doing it again...
    WTF ????
    its a 91 mustang gt 5.0
    5 speed , it came out this way.

    NEW parts

    its has a new A9L
    iag
    tpi
    tfi
    fpr
    starter relay
    255 lph fuel pump
    fuel relay
    eec relay
    mass air
    egr
    upper and lower intake gaskets
    tappit gaskets

    check all the fuse links and fuses
    40 pds at fpr


    so . got any ideas ????????????????????
     
    #1
  2. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Yes, pull all your codes. KOEO, KOER, and cylinder balance test.

    Report back with your codes
     
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  3. h mabry

    h mabry New Member

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    21 - Engine Coolant Temperature, ECT Sensor Out Of Self Test Range. 0.3 volts (250°F) to 3.7 volts (50°F)(O,R)

    44 - Secondary Air System Inoperative. bank one, passenger side (R)

    34 - EGR Valve Position/Pressure Feedback EGR Voltage Above Closed Limit (O,R), PFE or EVP circuit has intermittently failed above the closed limit of 0.67 volts (M)

    13 - RPM Not Within Self Test Lower Limit (R), DC Motor Did Not Move (O,M,R), Idle Speed Control motor or Air Bypass not controlling idle properly -generally idle too high

    85 - CANP Circuit Failure (O)


    and i forgot , I put new O2 's in yesterday.
     
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  4. h mabry

    h mabry New Member

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    canp not even on the car
     
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  5. h mabry

    h mabry New Member

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    cylinder balance test.


    1. 153 6. 148
    2. 130 7. 154
    3. 150 8. 152
    4. 153
    5. 148
    this is still a stock 91 short block.
     
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  6. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Thats not a cylinder balance test, but a compression test that shows number two is a little weak
     
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  7. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Looks like you need to start from square one and clear all codes to reset computer, do a base idle reset, the rerun your codes
     
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  8. h mabry

    h mabry New Member

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    I know what it is , just thought it might help . my car stoped doing the test today for some reason , i mean the enj light comes on when i start it but never lights up on the test cycle like it should ... this just started like 15 mins ago .
     
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  9. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Sounds like a bad ground. Check all your grounds and clean them all up. One loose or corroded ground can wreak havoc on this cars
     
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  10. mikestang63

    mikestang63 Mustang Master

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    Not to sound like the grammar nazi, but wtf is it lately with newbs who can't form a sentence or spell? When you do the KOEO test the car needs to be at operating temperature. As Mad said, go back. clear the codes- disconnect the battery for 20 minutes and turn the lights on- then reconnect the battery. Warm the car up then run the tests.

    Report back what the results are and be polite and you'll be amazed at the help you will get.
     
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  11. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    I can spell, but i probably have one of the higher typo ratings because Im primarily on my phone with the teenie weenie screenie
     
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  12. h mabry

    h mabry New Member

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    got all new grounds , bat to frame one from passager frame side to enj and one from driver side enj to starter solenoid and frame and one from rear enj to fire wall. O bat is in the rear hatch , it is going to the frame back there also.
     
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  13. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Still have the eec ground? From factory its mounted beside the solenoid
     
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  14. h mabry

    h mabry New Member

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    yes , it has one split into 2 , one is on the fender apron and the other one is grounded to the frame driver side.
     
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  15. mikestang63

    mikestang63 Mustang Master

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    [​IMG]
     
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  16. h mabry

    h mabry New Member

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    i get nothing when i try clicking on the pic thingy you posted.
     
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  17. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Damn rookies
     
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  18. mikestang63

    mikestang63 Mustang Master

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  19. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Games about to start
     
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  20. h mabry

    h mabry New Member

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    ive been messing with this problem for about a month now , i just cant figure it out ...
     
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