Loud "clacking/knocking" noise at idle - JeepForum.com

 
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post #1 of 8 Old 11-13-2005, 11:30 PM Thread Starter
nine54play
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Unhappy Loud "clacking/knocking" noise at idle

1986 Cherokee with a 2.5L FI

Has a loud... and I mean LOUD clacking noice coming from the front of the engine block at idle. It almost goes away completely when revved up but not totally.

Engine runs strong. But a little rich. Runs like a SOB down the freeway... runs smooth as silk at normal speeds... but at idle I feel like I'm gonna get a noise nuisance citation from the cops!!!

Used my stethescope to listen around. Listened at the valve cover, water pump, timing chain cover and oil pan/lower block. It's the loudest down near the oil pan... I've got enough oil in it... actually too much.

"Friend" said it's the water pump... no way!!!! This clack WAKES THE DEAD!!! Could I have a bad rod bearing or something? Is there any tricks I can use to diagnose the problem??

thanks in advance.

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post #2 of 8 Old 11-13-2005, 11:42 PM
Wicked 4.0
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Check you Torque converter bolts.

This happened to me, im sure they just came at little lose and its casuing enough Slack to bang around at idle.
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post #3 of 8 Old 11-13-2005, 11:48 PM Thread Starter
nine54play
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Quote:
Originally Posted by Wicked 4.0
Check you Torque converter bolts.

This happened to me, im sure they just came at little lose and its casuing enough Slack to bang around at idle.
I have a manual transmission.
but trust me... this noise is coming from the engine... the front of it specifically... I listened all the way back to the tranny and the noise gets more faint as I go back... it's definately in the front..
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post #4 of 8 Old 11-13-2005, 11:49 PM
Wicked 4.0
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I would still check it, casue i was almost postive i had a rod Knock, But it was the converter
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post #5 of 8 Old 11-13-2005, 11:50 PM Thread Starter
nine54play
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Quote:
Originally Posted by Wicked 4.0
I would still check it, casue i was almost postive i had a rod Knock, But it was the converter
Can't. don't own one.
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post #6 of 8 Old 11-13-2005, 11:51 PM
XJ4oh
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From the front? Maybe pull the timing chain cover off, chain could have alot of slack.. or possibly the harmonic balancer is going out and thrashing around.

'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
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post #7 of 8 Old 11-13-2005, 11:53 PM
Wicked 4.0
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ok so you have a clutch, My Next Guess would be a Timing chain.....
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post #8 of 8 Old 11-13-2005, 11:55 PM Thread Starter
nine54play
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Quote:
Originally Posted by XJ4oh
From the front? Maybe pull the timing chain cover off, chain could have alot of slack.. or possibly the harmonic balancer is going out and thrashing around.
Definately the front. and it sounds like metal to metal. Can I pull the chain cover off without pulling the balancer?
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