Question about 2002 Jeep Grand Cherokee

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Without warning I went out to start my Jeep and heard a loud ticking noise. My Brother-in-Law checked it out and said it would need a valve job but then the valve freed up and went quite again (no ticking). Five minutes later it got stuck again. Since I'm on disability income I just can't have it towed in to a shop without first know the average cost of a valve job or are there any additives that might help to free up the valve until I can save up some more money to have the work done? I still owe 5,000 on it so selling it is not an option and it only has 105,000 miles on it......

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  • n2lwc May 24, 2011

    What is "Engin Flush? Is there a certain name brand I should ask for at AutoZone. Someone told me to try doing an oil change with synthetic oil but replace the last quart wit Marvel Mystery Oil and it will most likely solve the problem...

    Thanks!

    Jim

  • n2lwc May 24, 2011

    Ok great. Thanks Ed, I will give it a try and let you know. It seems like it should work as I never had a problem with it before and it only has 105,000 miles on it. I was tied while recovery from spinal surgery so it was only started off & on for five minutes from late December to the beginning of April. I then drove it for about 120 miles it it ran great. The next day when I started it is when the loud ticking started so I'm hoping it was a carbon/sludge build up and this will solve the problem.

    Thanks again!

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  • 731 Answers

Add a quart of engine flush to your oil and drive for about 20 miles then change the oil and add an additive for "sticky valves" Any auto store ( Pep Boys. AutoZone NAPA) will have these items

Posted on May 24, 2011

  • n2lwc May 24, 2011

    What is "Engin Flush? Is there a certain name brand I should ask for at AutoZone. Someone told me to try doing an oil change with synthetic oil but replace the last quart wit Marvel Mystery Oil and it will most likely solve the problem...

    Thanks!

    Jim

  • Ed Mac May 24, 2011

    Engine flush is a petroleum product that when added to your oil helps breakdown sludge, It thins the oil and allows contaminats to be suspended in the oil. Thats why its necessary to use then drain it.

    There are many brands on the market Slick 50 , Gunk, Gumout all make this type of product. Marvel Mystery oil is an addative that you leave in. That you would put in after the flush OR you can just try it first and see what happens
    Good Luck
    Ed

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2006 cts 2.8 making loud ticking noise ,running rough and has misfire codes po300,301,303,305


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If its a Deeper "thud" it could possibly be a rod knock or even a piston slap. regardless if your oil level is ok and the noise remains get it checked

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