Question about 1998 Jeep Wrangler

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1997 4.0 Wrangler- Ran/started fine yesterday. Today it will only crank over. I replaced the coil, cap, rotor and plugs & wires this morning still no spark. What next?

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  • Larry Barnes Jul 29, 2012

    I'm having the same problem I tested the harness and only getting 6 volts instead of 12. Can't figure it out, can you help?

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The 4.0 with the distributor? Sounds like the control module inside the distributor went bad.

Also check that tiny wiring harness that comes into the distributor. Where it goes through that small rectangular rubber block. I have seen the rubber block wear through, allowing the tiny wire harness to rub on the distributor.

Eventually the insulation of the wire harness wears through, the wires touch the metal distributor body, and you get no spark.

Make sure that where the coil bolts to has a clean, good contact. The surface that those two bolts go through, clamping the coil to a metal bracket. That part of the coil needs to be well grounded. No grease, dirt, etc., on the surface where this part of the coil touches. DON'T depend on the two bolts to give a good ground contact!

If you don't have a multimeter, I suggest you go out, and buy a cheap one. About $10 to $12 bucks. Use the DC voltage side of the multimeter, (Set it to the 50 volt scale), and check the plug that comes to the distributor. With the key on you should get 12 volts.
If you don't check the ignition switch itself. (Down in the steering column. The key ignition switch is not the ignition switch)

Posted on Jul 18, 2009

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  • 55 Answers

The crank sensor, it's bolted to the transmisson.

Posted on Jul 18, 2009

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