4.0 sounds like a diesel - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-16-2001, 06:21 PM
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4.0 sounds like a diesel

Hi, I am a newbie to this board. I have just purchased a 1992 4.0l Wrangler and the engine has a "mechanical" sound to it. Kinda like a diesel. It has 140,000 miles, and has documented 3000 mile oil changes since it was new. (I bought it from a friend) It almost sounds like a knock, but the oil pressure warm at idle is 35 psi, and goes to about 50 on the gas.
Do these engines sound more "mechanical" than the average commuter car?
I have an 11 second Mustang, and now the Jeep is my new toy. I love it!!

1992 4.0l Wrangler
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post #2 of (permalink) Old 05-16-2001, 07:08 PM
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Re: 4.0 sounds like a diesel

Yeah, mine sounds like what you described. My pressure is around 38 idle, 50 on the gas. They dont run very quiet.

91 YJ 4.0

post #3 of (permalink) Old 05-16-2001, 07:47 PM
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Re: 4.0 sounds like a diesel

If it is in the upper end of the engine, it sounds like a rocker arm, not really a big deal. I would be more concerned if in the bottom part of the engine...

4.6 Stroker Scrambler
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post #4 of (permalink) Old 05-16-2001, 08:00 PM
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Re: 4.0 sounds like a diesel

My brothers 4.0 had a similar diesel sound and replacing the spark plugs helped it allot. I suggest giving that a try.

'85 Scrambler
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