intermittent loss of cmp or ckp

Posted by safirenside, Apr 16, 2011
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

  1. safirenside

    safirenside Proven Member

    DSM Profiles:
    1
    Joined:
    Jan 28, 2011
    Posts:
    98
    Likes Received:
    0
    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

    Joined:
    Mar 27, 2011
    Posts:
    30
    Likes Received:
    1
    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
    #2
  3. stayflalfy

    stayflalfy Proven Member

    Joined:
    Aug 4, 2010
    Posts:
    34
    Likes Received:
    0
    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
    #3
  4. safirenside

    safirenside Proven Member

    DSM Profiles:
    1
    Joined:
    Jan 28, 2011
    Posts:
    98
    Likes Received:
    0
    houston, Texas
    alright thanks man ill change the IAC and see if it fixes it
    #4

Share This Page