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Thread: Cranks, but won't start

  1. #1
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    Default Cranks, but won't start

    Here we go...
    1994 YJ, 4.0 and Auto trans.
    I pulled it in the garage for a quick tune-up. Once I was done with the wires, plugs, cap, and rotor. It would crank and crank, but wouldn't run.
    It ran fine when I pulled it in.
    I keep combing over it and I am completely stumped.
    I have have spark, fuel, and air.
    I have replaced..
    Wires
    Plugs
    Distributor
    Coil
    Fuel Filter and Pump.
    Crank posistion Sensor
    Throttle Position Sensor
    Map Sensor
    Cap
    Rotor
    Injectors
    Checked Compression
    Engine is grounded.
    I've checked and rechecked that I am Top Dead Center.
    I'm out of ideas.
    any one else have something, or hopfully ran into this problem and have the solution, this is getting really expensive really fast, All I wanted to do was tune it up.. I guess I've done that.
    Any help or ideas are appreciated.
    "Life is tough, it's even tougher when your stupid"
    Sgt. Stryker, USMC, Sands of Iwo Jima

  2. #2
    The Texan TexCJ7's Avatar
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    when you changed the wires did you do them one at a time so you know they are in the right place might be a dumb ? but i've done it

    did you turn the distributer
    2012 kawasaki Teryx4

    Sold-85 CJ7, 6 inch lift, siting on 36's, welded rear, lots of drain holes

    Sold-93 YJ, 4.0,

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    wires are all correct, and I set the distributor correctly at TDC Top Dead Center, with the rotor set to fire at #1 as the manual says. cranked then checked again for TDC, it's set right..
    any ideas are great, eventually something will come up I haven't tried..
    thanks for the suggestion
    "Life is tough, it's even tougher when your stupid"
    Sgt. Stryker, USMC, Sands of Iwo Jima

  4. #4
    Time n Money Ghost00TJ's Avatar
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    You say the distributor is at TDC? The #1 piston should be at the top of the compression stroke or TDC at the same time the rotor would be pointed at the #1 wire.
    If the #1 piston was on the exhaust stroke the rotor would still be pointed at the #1 wire, however, you are 180 degrees out and it will not start.

    Seem as if you have it covered not sure what else it could be hell you replaced everything.
    F'it, aint my Jeep!
    Beer does a Jeep Good

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    I'm sure the timeing is set.
    Like I said, after cranking it I checked the rotor placement. If I was off one 180, it would be pointed to the (# 3?or is #4?) I'd have to recheck the manual, but it would be 180 off, then it's as simple as turning back to TDC, then pulling and re-installing the distibutor so it does point at the #1 wire on the compression stroke.

    I had to play with it to get it right. When cranking it would sound right or not. I'm dead sure it's right.


    The only thing I can think of next is replacing the "brain"
    and I'm having a hell of a time tracking one down...

    Other ideas and suggestions are still welcome.
    Last edited by smahlau; 02-12-2009 at 15:54.
    "Life is tough, it's even tougher when your stupid"
    Sgt. Stryker, USMC, Sands of Iwo Jima

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    Swap out the new MAP sensor with the old one, may be a factory defect. Check fuel pressure, may have gotten wrong pump. Good Luck
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  7. #7
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    coincidently, I did return the map sensor when that didn't pan out. it's the only thing I did take back.
    I put the return toward a second new set of wires, and rechecked the plugs.
    I am getting plenty of fuel pressure. and the new injectors are getting it where it needs to be.
    I'm going to be trying a new computer.
    next stop, a tow to a local mechanic.
    No check engine light, so I don't think they'll get any codes.
    J.ust
    E.mpty
    E.very
    P.ocket
    Thanks for the help.
    Last edited by smahlau; 02-12-2009 at 18:13.
    "Life is tough, it's even tougher when your stupid"
    Sgt. Stryker, USMC, Sands of Iwo Jima

  8. #8
    Land Squid Jeffb_79's Avatar
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    Another dumb idea.... are you positive you're battery isn't dead or near dead?

  9. #9
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    The battery has been replaced too. and it's still cranking like a champ. Spark is still good, and fuel is still being delivered.
    "Life is tough, it's even tougher when your stupid"
    Sgt. Stryker, USMC, Sands of Iwo Jima

  10. #10
    Junior Member andy02's Avatar
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    Does it do anything when you crank it? Backfire, etc? I think it may be a timing issue. The plug has to fire just before TDC or the engine will not run. If it fires at exactly TDC, the piston is already on it's way back down before the exploding fuel can push it down and thereby, no starty. Try loosening the distributor hold down bolt and turn the ditributor slightly while someone tries cranking the Jeep.

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