intermittent loss of cmp or ckp

Posted by safirenside, Apr 16, 2011
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  1. safirenside

    safirenside Proven Member

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    houston, Texas
    alright so i have a couple codes that poped up
    P1391 intermittent loss of cmp or ckp
    P1390 timing has skiped one tooth or more

    i was wondering what the signal voltage is suppose to be for the cam sensor and the crank sensor

    i was reading around 13 volts for the cam sensor and 1.4 volts on the crank

    also forgot to mention my timing is dead on
    #1
  2. Bomalleygst

    Bomalleygst Proven Member

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    Gettysburg, Pennsylvania
    Im actually havin the same exact problem with mine. Except mine runs roughs when i rev it and after i drive for a minute it will shutt off and not start up for a couple mins. If i find anything out ill let ya know
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  3. stayflalfy

    stayflalfy Proven Member

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    Mounds View, Minnesota
    I was getting codes like these as well on my 420a and i replaced all the sensors that it said were messed up. Turns out it was just my IAC. I dont know why the computer threw a code for cmp and ckp. I cant remember what the voltage is supposed to be for those two but i will check in my chilton when i get home
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  4. safirenside

    safirenside Proven Member

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    alright thanks man ill change the IAC and see if it fixes it
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