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No Spark- where to start?

Discussion in 'Stock 1995 - 2001 Explorers' started by gmcward, August 22, 2010.

^^Searches ExplorerForum.com^^





  1. Froilan

    Froilan New Member

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    It still no spark and no start
     
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  3. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    I suggest a compression test on at least one cylinder in both banks. That should indicate if the camshaft timing is off and whether or not there has been valve damage.

    How are you determining that there is no spark?
     
  4. Froilan

    Froilan New Member

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    It still no spark and no start
    Visually taking spark plug wire and checking it with a light tester or with a screw driver
     
  5. Froilan

    Froilan New Member

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    How do i check if the ckp wire that send signal to the the pcm or the ignition coil working?
     
  6. Froilan

    Froilan New Member

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    But i will do what you said first test fir compression
     
  7. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    The CKP sensor is difficult to test. Make sure that the PCM is getting power when the ignition is on. Does the check engine light illuminate and the fuel pump run for a few seconds when the ignition is switched on?
     
  8. Froilan

    Froilan New Member

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    Yes the i can hear tne fuel pump and the check engine is gone due to the bzttery dying
     
  9. 1998Exp

    1998Exp Well-Known Member

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    As someone already mentioned, it's hard to test. It really takes an oscilloscope to see what it's doing. You may be able to measure a small AC voltage (perhaps around 0.1V) between the two pins when cranking. I believe that this is a coil pickup, not a Hall sensor (because the schematic does not show any power connection), so you should see a resistance of about 2KOhm between the two pins. More importantly, check the connector and its continuity to the PCM -- pins 21 and 22. Also make sure that neither of the two wires is shorted to ground.
     
  10. koda2000

    koda2000 Explorer Addict

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    If you have a multi-meter I've tested my CKP for continuity by passing a magnet over the business end testing for a continuity tone between the 2 prongs. Not much to go wrong with these things and I believe they are a Hall Effect device. No voltage to speak off. Note that both its wires are the same color [black].

    More likely a connection/wiring issue between the CPK and the PCM. You can test the connection back to the PCM with a multi-meter also. You'll need a pin-out for the PCM connector to know which wires go to the CKP.
     
  11. Froilan

    Froilan New Member

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    I finally had the compression tested on one in each side and its very depressing right side is 40 and the left side is nothing, what does it means, and thanks for the info on cpk and pcm guys.
     
  12. koda2000

    koda2000 Explorer Addict

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    It means you need a new engine. Sorry, broken/jumped timing chains, bent valves... Ugly.
     
    Last edited: August 18, 2019
  13. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    Sorry about the bad results. Assuming the camshaft on the left side is still rotating then there is valve damage. On the right side the camshaft is out of time with the crankshaft but there probably is no valve damage. I suggest that you remove the oil filler cap, look thru the opening while rotating the crankshaft using the harmonic balancer retaining nut and verify the camshaft on the driver side still rotates.
     

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