Question about 2002 Jeep Grand Cherokee

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The engine has no compression,when try to start the engine it turn slowely and backfire.battery ok, stater ok.(jeep grandcherokee 2002 year, engine 6 cylinder.)

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  • osmanmackoy Jul 31, 2009

    no the timing belt did not change.the engine has 78000 miles.it happen suddenly.

  • osmanmackoy Jul 31, 2009

    no, we did not change the timing chain,the engine has 78000 miles, and yes it happen sudden after i wash the jeep.(not the engine)

  • Bruce Hathcock May 11, 2010

    Have you changed the timing chain? Sounds like your timing chain has jumped time. Did it just start happening all of a sudden? How many miles on the engine?

  • Richard Scordino May 11, 2010

    How are you measuring compression?

  • Z Laws May 11, 2010

    How do you know the battery is OK? It can have power, but not enough. How do you know the engine has no compression? Has it been tested?

    Have you tried a jump start from a running car?

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Hello osmanmackoy; My name is Roger and I will help you. First have you done a compression test? If so the compression must be over 100 psi. in order for the cylinder to fire. This would be a bare minimum. I would also look at the oil pump drive unit. This would be located where the distributor would have been on the older engines. There is a sensor mounted on the top of the drive. Remove the sensor and check the inner shaft. There should be no side to side play in the shaft.If the shaft moves side to side You need to replace it. This sensor is used by the computer to tell what cylinder to fire. The computer will not know which cylinder is next to fire. This will cause a no start or backfire condition.
Please rate the quality of the answer given as this way we know the answer was helpful. Should you need further help Please just ask . Thank You for using Fix Ya. Roger

Posted on Jul 31, 2009

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I am going to take a stab at this....as I think you may have a head gasket that has blown out. The head gasket will cause a lil white smoke, and make idling extremely rough. Sometimes water will fill up in the top of the cylinder in the compression chamber when this leak, even minor occurs. That would explain some of the compression issues. Obviously with no compression it will not run properly or even fire if there is water vapor pentrating into chamber mixing with fuel giving you that white smoke/steam.

These are somewhat time consuming to change, but not difficult. The backfiring is caused by the computer trying to compensate for the firing issue. The computer when you change the head gasket is easy to fix. After repairng gasket, try to start the car a few times but not allowing it to run as it will just continue backfiring. Turn key off, let the vehicle set about 30 minutes or so, then go back and the vehicle should run properly again.

Let me know,

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