Question about 1989 Jeep Cherokee

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I have a 89 cherokee, that has just had the fuel pump replaced. Now it has no spark and won`t fire. Does the fuel pressure need to be up to activate the coil? Or should I look into the new fuel pump being faulty? Is it possible that the fuel system needs to be bled?

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  • siriusfun23 Nov 15, 2010

    I can

  • siriusfun23 Nov 15, 2010

    The ignition switch seems to work fine. Engine turns over, and all other functions seem to work, just still no spark to the ignition system. I also changed out the cap and rotor, they were in pretty bad shape. Is it possible the coil is bad? I had one start to intermittently stop working on another vehicle, and after sitting it would work for a short time, then quit again. Did this for about a week before it finally quit for good. I am wondering if this could be the original trouble, and not the fuel pump before it was changed? The Jeep was intermittently stopping, and then after sitting would work for a short time again. Is this a possibility?

  • siriusfun23 Nov 19, 2010

    Still working on checking the ignition switch, and just got a gauge to check the fuel pressure. It is building pressure, but I`m not sure yet how much. Still haven`t found out the reason for no spark yet. Will keep checking.

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Hi!!
Most likely the problem is with the ignition switch. Check related wiring and also check the new fuel pump pressure and connectors. On this type of vehicles, the harness coming out of the computer to the motor tends to rub against the protruding studs coming off the fender well and the firewall, over time, it wears the outside insulation and the wires insulation, shorting out and preventing the engine from start.
The Fuel System usually bleeds itself and has nothing to do with the Ignition System (spark), except that they both are controlled by the PCM.
Check those things and keep me posted!!

Posted on Nov 13, 2010

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