Question about 2008 Jeep Wrangler

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Thumping Noise From Engine 2008 Wrangler

My 2008 Wrangler has a thumping noise (low noise) coming from the passanger side of the engine below where you put in the oil. It is rhythmic and it increases as you increase the RPMs. Is this normal? I have not heard it for 18000 miles but recently heard it and it is not going away. Thanks.


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  • drchiptaylor Apr 12, 2009

    I took it to them last week and they replaced the belts and said that they thought is was something to do with the tension being faulty. I still hear it. It is immediately below where you fill the oil. So I do not go back in there and have them blow me off how do I explain to them how to diagnois this? It may sound strange but i do not want to spend hours out there with no solution.

  • drchiptaylor Apr 12, 2009

    OK - -last comment until after I see them tomorrow. I have the oil changed every 3000 miles religiously. In between the last time I had it changed and the most recent change my "change oil" light came on. I assumed that they simply had not reset it; however, i took it in to have it changed "early." This problem was occurring immediately before and has continued...

    1) Is changing the oil what you are calling "an oil flush?"

    2) Would the "change oil" light help confirm your diagnosis?

    Thanks for the help. I will let you know how it turns out tomorrow.


  • drchiptaylor Apr 12, 2009

    I am not sure what you mean by "half the engine speed." I hear it when I am idle - rather intermittently- and then when I increase speed to 1500 rpm. It is much lower than the other sounds I hear and it is rhythmic.

  • drchiptaylor Apr 12, 2009

    it is a 3.8 L V6. It is a 2008 Jeep Wrangler Unlimited X 4DR with 19000 miles.

  • drchiptaylor Apr 12, 2009

    Noise stays the same regardless of engine temp. Just to make sure I understand you...if it DOES NOT go away with higher engine temps then I need to have them check the lifters per the that correct?

  • drchiptaylor Apr 12, 2009

    ok. Did you see my question about the "change oil" indicator coming on and the fact that I had the oil recently changed. Did that constitute the "oil flush" and how about fact that the oil idiot light came on...does that further confirm the diagnosis?

  • drchiptaylor Apr 13, 2009

    Yes. I appreciate it. Chip


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Chances are you have a collasped lifter. i have seen this happen on many of mopars newer engines. there is a factory procedure/ recall to correct this problem.

take your jeep to the dealer, as this problem can lead to serious engine problems if the lifter begins to come apart.

Posted on Apr 12, 2009

  • 5 more comments 
  • speedneon Apr 12, 2009

    supposedly this lifter collaspe comes from clogged lifter passages. if they can not repair it with a simple oil system flush they have a revised lifter with a screened passage to prevent this from happening.

  • speedneon Apr 12, 2009

    okay to verify is the noise appromximately half of the engine speed.

  • speedneon Apr 12, 2009

    is your jeep a v6

  • speedneon Apr 12, 2009

    to verify is your jeep a 6 cylinder?

    does the noise not go away with change in engine temp?

    if so this recall is for you. but you may have to fight the dealer tooth and nail to have them fix it. with the shape mopar is in right now your timing is not the greatest.

  • speedneon Apr 12, 2009

    correct if it does not go away, they need to check and replace the lifters. that is correct.

    they use the same lifters in alot of the their engines and with the same results.

  • speedneon Apr 12, 2009

    yes i read that comment.

    it did raise a question in my mind, about the alignment of the bottom skid plate. it must be removed to change the oil on the jeep unlimited. but from my experi mis-alignment of the bottom skid plate, which is a protective covering made of metal to protect the engine and transmission during off road activities, will result in a groaning sound over bumps and such. nothing like your describing.

    but i would have them check it anyway while you are there.

  • speedneon Apr 12, 2009

    also an oil change does not constitue an oil flush. they are similar but different.


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