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Old 06-04-2011, 03:31 PM   #1
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Default Engine tap

Do most 4.0s have an engine tap? My jeep is fine but ive bin looking around on craigslist and someone was selling a cherokee and the engine was taping an they said most 4.0s get that and its no problem
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Old 06-06-2011, 12:04 PM   #2
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Yes. But there is a difference between a noisy motor and a bad motor. Sometimes if you don't know what your listening for, its easy to confuse them.
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Old 06-06-2011, 12:30 PM   #3
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One person's interpretation of a sound as a "tap" could sound more like a knock to another. If you look at it make sure you listen to it and maybe see if you can track it down... If it is a leaking exhaust manifold or noisy injector that is less a problem than a noisy valve train or something worse...
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Old 06-06-2011, 01:50 PM   #4
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As with all cars, some engines are noisy, some are not. If it's knocking, it's terminal, but sometimes it could be a noisy lifter, or in some cases, the injector pulses can be quite noisy. I know my 98 Sport has some loud f'n injectors, the ticking can almost make you crazy...lol
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Old 06-06-2011, 02:12 PM   #5
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mine sounds like a diesel when running... and it actually want to run a little as it shuts off too.
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Old 07-19-2011, 04:45 PM   #6
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Quote:
Originally Posted by 00jeepXJ
mine sounds like a diesel when running... and it actually want to run a little as it shuts off too.
Check out the attached picture. I got this from my Haynes Repair Manual which covers Jeep Cherokee, Commanche, and Wagoneer Limited; all models 1984 through 2001.
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Engine tap-forumrunner_20110719_174341.jpg  
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Old 07-19-2011, 04:50 PM   #7
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Quote:
Originally Posted by 00jeepXJ View Post
mine sounds like a diesel when running... and it actually want to run a little as it shuts off too.
That's bad.
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Old 07-19-2011, 05:16 PM   #8
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Better leave that one on Craigslist
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Old 07-19-2011, 08:26 PM   #9
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I had a slant six that sounded like a diesel when it idled, for 150,000 miles. Had to put it to rest when the Duster's body rusted out at 310,000. I was always waiting for major failure though. My '98 XJ rattles in the back of the motor. It has been doing it for two years, I'm waiting.
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Old 07-19-2011, 09:03 PM   #10
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I think I get some sort of valve noise at idle.....OPO says it's always done that (he's my brother). 250,000+ miles & runs 110%
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Old 07-20-2011, 12:51 AM   #11
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Mine has some *noise* at idle but i cant hear a thing when i give her gas. She's about to roll 100,000 miles. Im not gonna worry about it unless it gets worse
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Old 07-20-2011, 02:20 PM   #12
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sometimes the transmission makes a knock, pretty convincing as a rod knock but it quiets after 2000 rpm. mine has 220000 on it and still burns a little rubber all stock with the knock.
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Old 07-20-2011, 02:20 PM
 
 
 
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