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Thread: Truck won't start

  1. #1
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    Default Truck won't start



    Was able to start my truck the other day and it died at the gas station filling up. It'll crank but won't turn over. I replaced the CPS today and it didn't help checked the spark plugs and they looked good. I'm not sure what else to do. I'm assuming it's not a fuel issue since it was running fine and I can hear the rail prime when I turn the key to the accessory but I could be wrong. Any ideas?

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    Default Re: Truck won't start



    You can hear the rail prime. Can you confirm there is fuel pressure?

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    Default Re: Truck won't start



    Check for spark at the end of the plug wires, if no spark, check at the coil
    , then for Fule/pressure.
    ___________
    LETS GO !!!

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    Default Re: Truck won't start



    I have not checked the fuel pressure. Checked for a spark got nothing. Replaced the ignintion coil then the cap. Would have replaced the rotor but was given the wrong one so I'll do that tomorrow.

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    Default Re: Truck won't start



    My trick is to spray some starting fluid into the intake. If it fires over, it is fuel. If it doesn't, it is likely spark. I keep a spray bottle of starting fluid just for that cause.

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    Default Re: Truck won't start



    Check the output from the coil (rotor not needed, unless I don't envision your setup correctly).

    Hold it, coil output wire, 1/8 to 1/4" from block ground and have an assistant try to start the motor. Spark or no? If no, then it's further up the line in the electrics/electronics from coil output (coil or what is driving the coil). If there is spark - that's good, then perhaps rotor or dist cap.

    It sounds like you have two coils - orig and new. If no spark from output of either, then it's what's driving the coil. Anything else in your circuit than the CPS? Any blown fuses (a fuse driving the computer??).

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    Default Re: Truck won't start



    What. Jim said !
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    Default Re: Truck won't start



    dscowell previously posted:
    "Was able to start my truck the other day and it died at the gas station filling up."

    Typically, a sudden change is electrical in nature. Is it possible you got a slug of bad gas? The ether test that Jeff mentioned is a good way to find out.
    ___________
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    Default Re: Truck won't start



    Doubt bad gas cause I was down to 2 gallons went to the gas station filled up and it did nothing. It was having some trouble before with long stats and what not. We did check the relays and they all seemed fine. I'll take a look at the fuses.

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    Default Re: Truck won't start



    You got to know if you are missing the spark or fuel. While I have used a screwdriver and metal for testing all my life, the cost of tester from Harbor Freight makes it a good tool to have in the garage.
    http://www.harborfreight.com/inline-...ker-69014.html
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    Default Re: Truck won't start



    dscowell previously posted:
    "Doubt bad gas cause I was down to 2 gallons went to the gas station filled up and it did nothing. It was having some trouble before with long stats and what not."

    I meant bad gas from the station when you filled the tank. Was a tanker there when you filled up?

    I am leaning toward the fuel pump on this one. The way to prove me wrong is to get a fuel pressure gauge and collect hard data.
    ___________
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    Default Re: Truck won't start



    Did the screw driver and got no spark. Used the multimeter on some plug wires and got nothing. Tried it on the coil and did get a reading I don't remember what it was but we at at least got something out of it. Replaced both the cap and rotor and it didn't do anything either. Also checked some grounds and there was no corrosion and they didn't look dirty. I can checked the fuel pressure but if we are getting no spark I don't think the fuel pressure will make a difference. Starter should not be bad either since I had that replaced last year. Today it was cranking and the starter did sound like it was trying to fire up but didn't.

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    Default Re: Truck won't start



    If you're not getting spark, ignore all other items (starter, fuel) until you get spark. Holding the coil's high tension / spark plug wire to test for a spark jumping from it to block ground is all the test you need.

    No blown fuses?

    What year vehicle is this? What's the layout (what parts are in the mix - you mentioned CPS sensor) of the ignition system?

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    Default Re: Truck won't start



    Looked at all the fuses they are all good. Tested the relays they are good too. It's a 90. Not sure what else is involved in the ignintion system. Ill look into it and see.

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    Default Re: Truck won't start



    I have a book I can "loan" to you. Check your PMs.
    ___________
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    Default Re: Truck won't start



    Double check that your distributor housing is tightened down. If it's loose it can rotate over time and put you either full retard or full advance causing extreme timing issues leading to a no start. Could be so off that the rotor is not touching the contact in the cap, thus no spark out the plugs. Just try twisting it by hand to check it.

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    Default Re: Truck won't start



    check out this thread. it should get you headed in the right direction http://www.jeepforum.com/forum/f11/1...-spark-839999/

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    Default Re: Truck won't start



    Patrolman previously posted:
    "My trick is to spray some starting fluid into the intake. If it fires over, it is fuel. If it doesn't, it is likely spark. I keep a spray bottle of starting fluid just for that cause."

    I like having a can around for bees and wasps. Kills em dead quicker than anything I've ever seen.........well besides fire, but this is a little safer.

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    Default Re: Truck won't start



    I utilize the can for the same thing, with the help of a lighter.

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    Default Re: Truck won't start



    Don't assume that the CPS is good just because it is new. When mine went out in my Jeep, the one I put in was bad too, and took a second new one to get it running again.
    ___________
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    The art of getting dirty and going broke while slowly heading nowhere and taking all day to do it...

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