Question about 1993 Jeep Grand Cherokee

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1993 Jeep Grand Cherokee no electricity to coil

I have a 1993 Jeep Grand Cherokee Laredo I6 4.0L. It has been sitting for about a year and a half and I tried to start it and it would crank, but not fire. I have been working on it for awhile now and there was no fire to the distributer, so I checked the coil, and nothing even going to the coil. When I try to start it after about 4 cranks might light will light up for about half a second and thats it (wire going to the coil). It will not light up again until I have waited a while. If I try to crank it again right away it will not light up again, even for a second. So if there was a bad part, im thinking there would not even be a spurt of electricity going to the coil, ever. I read on here most people saying this problem is due to a bad crankshaft position sensor, but I read that if the crankshaft position sensor was bad that the fuel pump would also not work. I put my head near the gas tank and had someone turn on the key and I could hear the fuel pump engage so I do not believe the problem is the crankshaft position sensor. Maybe the problem is in the computer?

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  • HeathG Jul 19, 2009

    Ok I tried this and the spark plug did spark, so my coil is good, which is what I thought. The problem is there is not any electricity going to my coil. What is next to check?

  • HeathG Jul 20, 2009

    Problem has been solved. Mice chewed through my Crankshaft Position Sensor wire.

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It sounds like focusing on getting the spark then you can start the engine.You want to confirm everything works from the coil, so you can find out what causing the coil is not working. Here are what to check the coil before a replacement::
1- Disconnect the Positive cable on the battery.
2- Hook a spark plug directly to the coil wire ( the one to get to the distribution cap)
3- Find a long double wire so you can connect from the terminals of the primary coil to the battery.
4- Connect each wire end to the terminal of the primary coil. It doesn't matter which polarity.
5- Connect 1 wire to the frame ground.
6- Hold the other wire and quickly swipe it over the positive terminal of the battery. Reapeat it until are sure that you get spark or not.
7- You should see or hear a spark. If this is the case your coil is good. If itis not, your coil is bad and it need a replacement. Problem is solved.
4- If the coil is good, the problem would be from the Primary of the coil back to the ignition key: No electrical signal to turn on the coil.

Hope this can help.

Posted on Jul 19, 2009

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