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#1
07-08-2004, 01:55 PM
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Engine sounds like a diesel
Hi-
My 95 GC with the 4.0 liter is making interesting noises. The best way to describe it is that it sounds like a diesel. It's not super loud, but it's definitely got that diesel "knocking" sound. I have recently run some engine flush through it and changed the oil. I did the flush because I changed the exhaust manifold a week ago, and after looking inside the intake manifold, and also checking under the oil cap, I saw a LOT of crud build up. So, anyone have any thoughts on the diesel? 
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#2
07-09-2004, 10:16 AM
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Re: Engine sounds like a diesel
Could be a gasket of the exhaust manifold bad.
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#3
07-09-2004, 12:42 PM
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Re: Engine sounds like a diesel
its typical of the 4.0 I6. Keep ur oil level up & you should be safe. Some say changing to a heavier oil will help
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#4
07-09-2004, 08:51 PM
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Skirtless pistons and a bad boring bar caused this noise. It's piston slap. Mine has 230,000 original miles on it and doesn't burn a drop! It's noisy but strong.
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#5
07-11-2004, 08:21 PM
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Re: Engine sounds like a diesel
Piston slap does not sound good. That can't be "normal", can it? I just got back from a 400 mile round trip with no problems, but I am concerned about it.
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#6
07-11-2004, 08:44 PM
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Yes, it is considered normal in these engines. People have used Lemon law on them because some of the earlier ones were so noisy.
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#7
07-11-2004, 09:25 PM
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Re: Engine sounds like a diesel
Hmm.. Interesting. I guess I won't worry about it, then, since it appears there's nothing I can do about it, and you seem to have a lot of miles on yours with the same problem. Thanks for the replies.
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