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No spark at coil

Discussion in 'Cherokee' started by Bobwrs22, Oct 17, 2018.

  1. Oct 17, 2018 at 10:58 AM
    #1
    Bobwrs22

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    Bobwrs22 [OP] Member

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    I was driving and I broke the u-joint at the rear diff the Jeep died and now won't start and ideas why
     
    Bobwrs22, Oct 17, 2018
    #1
  2. Oct 17, 2018 at 11:15 AM
    #2
    aggrex

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    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome! Two separate issues that might not be related unless you were jeeping over some obstacle with some passion. Water crossing?
     
    aggrex, Oct 17, 2018
    #2
    JKBob 25 likes this.
  3. Oct 17, 2018 at 11:20 AM
    #3
    Bobwrs22

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    Bobwrs22 [OP] Member

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    Nope driving on black top maybe 20 mph but what gets me is it started giving me this problem when it broke I didn't think the two were related but can't rule anything out
     
    Bobwrs22, Oct 17, 2018
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  4. Oct 17, 2018 at 11:27 AM
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    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Did the driveshaft going flopping around? If so could it have caught any wires under the Jeep such as the fuel pump?

    If not, the Crank Position Sensor (CPS) is a common failure that will cause a no spark symptom.
     
    Prerunner1982, Oct 17, 2018
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  5. Oct 17, 2018 at 11:33 AM
    #5
    Bobwrs22

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    Bobwrs22 [OP] Member

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    Fixing to buy and install now will update
     
    Bobwrs22, Oct 17, 2018
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  6. Oct 17, 2018 at 11:37 AM
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    Prerunner1982

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    Prerunner1982 Well-Known Member

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    You might test it first.

    TESTING PROCECURE for 1987 – 1990 4.0 L engines
    Test # 1 - Get a volt/ohm meter and set it to read 0 - 500 ohms. Unplug the CPS and measure across the CPS connector's A & B leads. Your meter should show a CPS resistance of between 125 - 275 ohms. If the CPS is out of that range by much, replace it.

    Test # 2 - You will need a helper for this one. Set the volt/ohm meter to read 0 - 5 AC volts or the closest AC Volts scale your meter has to this range. Measure across the CPS leads for voltage generated as your helper cranks the engine. (The engine can't fire up without the CPS connected but watch for moving parts just the same!) The meter should show .5 - .8 VAC when cranking. (That's between 1/2 and 1 volt AC.) If it's below .5vac, replace it.
     
    Prerunner1982, Oct 17, 2018
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    JKBob 25 and aggrex like this.
  7. Oct 17, 2018 at 12:21 PM
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    Awrench

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    Awrench Well-Known Member

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    did you check SPARK, FUEL PRESSURE, fuses. WHY do we pick the CKP as a problem part? A PIA to change....

    I am not sure what model, engine etc is there 12v at injectors? at coil?.

    sorry confused - is there 12v at coil? is coil being pulsed?
     
    Awrench, Oct 17, 2018
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    JKBob 25 and aggrex like this.
  8. Oct 18, 2018 at 12:08 PM
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    Bobwrs22

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    Bobwrs22 [OP] Member

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    Crank position sensor was the problem new question I can run 85 + in 4th gear but can't hold 75 in 5th any ideas
     
    Bobwrs22, Oct 18, 2018
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    aggrex and Prerunner1982 like this.
  9. Oct 18, 2018 at 12:10 PM
    #9
    Bobwrs22

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    Bobwrs22 [OP] Member

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    Awrench it's a 89 Cherokee Laredo with a 4.0 inline 6 4x4
     
    Bobwrs22, Oct 18, 2018
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  10. Oct 18, 2018 at 12:16 PM
    #10
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Running any oversized tires?
     
    Prerunner1982, Oct 18, 2018
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  11. Oct 18, 2018 at 12:19 PM
    #11
    Bobwrs22

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    Bobwrs22 [OP] Member

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    31s a little wide nothing crazy
     
    Bobwrs22, Oct 18, 2018
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