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  1. #1
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    Default New Crank Position Sensor

    New to this forum. I have a 96 Xj sport 4.0. I've been battling overheating for a while. Replaced Thermostat, water pump, radiator (replaced with a tri core aluminum with 3 efans), as well as doing things like burping only to find out it was my Crank Position Sensor. Old Cps can fail due to heat and once I replaced it with an aftermarket sensor (oem n/a) it's having random misfires. It idles very rough especially when hot. Anyone else have this issue?


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  2. #2
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    Default Re: New Crank Position Sensor

    I assume you are getting the P030X codes occasionally. This is generally caused by fuel in the rail vaporizing. Once the vapor is expelled, it will run normally. You need to heat shield the fuel rail.
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
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    Default Re: New Crank Position Sensor

    Quote Originally Posted by 4.3LXJ View Post
    I assume you are getting the P030X codes occasionally. This is generally caused by fuel in the rail vaporizing. Once the vapor is expelled, it will run normally. You need to heat shield the fuel rail.


    I got the p0302 codes. Cylinder 2 was really misfiring. But that makes a lot of sense. I think its weird tho that it started doing it as soon as i replaced the cps. But maybe its only because the engine bay was allowed to get to new levels of heat with out the cps failing. But its worth a shot. Thanks


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