Question about 1993 Jeep Grand Cherokee

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93 jeep grand cherokee won't start. It turns over but doesn't start. It gets gas..i have replaced the spark plugs, coil, distributor cap, rotor, and wires.I have an optima battery which is still working great. ECM gives only codes of 12 and 55 cause I took neg battery cable off to reset computer.

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If you have no spark, the most likely problem is a bad crankshaft position sensor. it is mounted on the bellhousing. below intake/exhaust manifold. held in by 1 bolt. A new CrankShaft position sensor should come with a small pice of heavy paper/ thin cardboard to use to set proper air gap between flywheel and sensor.

Posted on Sep 13, 2010

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I have a 1996 Jeep Grand cherokee with the 5.2l v-8 engine. Last week I started it, and it ran for about 1 minute before shutting off. The engine cranks, but no ignition. I replaced the Crankshaft position...


Time to meter voltage. Start with the 12V circuit. Are you getting voltage at the coil. Does the voltage fluctuate when the engine cranks? If yes to both check the high voltage circuit. Start with the coil then the distributor then each plug. You should be able to find where the spark is failing.

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Yellow means weak spark should be blue check the coil tower where the coil wire attaches on the coil for corrosion. Also check the spark plugs for wear.

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Pull off your distributor and check the rotor and the underside of the points on the distributor. If one of the points is blackened then it is possible that you need to replace the distributor cap and rotor.

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You really should be using a good manual as a guide fro testing. For wiring diagrams chiltons is better than haynes. Have you checked power flow through the ASD relay??

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The only thing left to replace would be the electronic trigger module which is mounted inside the distributor. If this module is bad it won't switch the coil on and off to produce spark.

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CHECK ASD RELAY THAT IS AUTOMATIC SHUTDOWN RELAY IN THE POWER DISTRIBUTION CENTER UNDER THE HOOD IN ENGINE COMPARTMENT.IF ASD RELAY GOOD PROBLEM COULD BE CAMSHAFT SENSOR IN THE DISTRIBUTOR.TO SAVE TIME AND MONEY HAVE JEEP SCANNED FOR CAMSHAFT SENSOR AND CRANKSHAFT SENSOR FAULTS.

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