Question about 1996 Jeep Grand Cherokee

2 Answers

All my cylinders are misfiring.

I just took my Jeep to Autozone to reset the check engine light after replacing the idler pulley and power steering pump pulley and the autozone tech said that all eight of my cylinders are misfiring. What could be the cause

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Hi. This vehicle is equipped with a Electronic distributor ignition assembly. There is no ICM(ignition control module) on your model. This will narrow the problem areas down a bit. The most common area of concern will be the distributor cap.This Component may be worn, cracked, or loose. Inspect the cap for faults, and replace if necessary. The next area of concern will be a set of faulty, or worn spark plug wires. Inspect the wire sets for damage. If you have not replaced the sets for quite some time, simply replace them asap.

Another area of concern will be the coils. The ignition coil is designed to operate without an external ballast resistor. Inspect the coil for arcing. Test the coil primary and secondary resistance. When using an ohmmeter, the primary readings should be 0.97-1.18 ohms and the secondary resistance should be 11,300-15,300 ohms. replace the coil(s), that do not rate correctly.

The above areas are the most common. Here is a list of some other problem areas, that will cause multiple misfiring.

1. Crankshaft/Camshaft sensor- Check the wiring at the Crankshaft sensor housing. Make sure the sensor is not loose, or damaged. The cam sensor is mounted in the distributor rotor area, under the cap. It is an integrated part of the distributor.

2. Spark plug(s)- replace if necessary.

3. PCV Valve - Check the valve, and hose for damage.

4. Fuel Pump - A weak fuel pump will produce less than normal pressure. this will cause the engine g to misfire. Check the ground at the pump for corrosion. Clean, ro replace, if necessary.

5. Timing settings - A slipped timing chain, or belt will cause a misfire, also. check the timing ratings for slipped intervals. replace the belt, or chain, if needed.

6. Injectors - A faulty set of injectors will cause a misfire. make sure that the injectors are functioning properly.

7. MAP- A failed MAP sensor will induce misfiring. This will, usually, will trigger the engine light.

Posted on Dec 11, 2009

  • Michael Masters
    Michael Masters Dec 11, 2009


    • NOTE_ Check for crossed wire sets, as well.


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  • Master
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Can you feel it misfire. If so you may of hooked up wires wrong or you have a big vacuum leak

Posted on Dec 11, 2009

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