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Old 04-13-2012 | 06:35 PM
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stang23456
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From: Port Orange,FL
Year: 1999
Model: Cherokee
Engine: 4.0
Default Knock
Hearing small knock coming from motor with 140 k miles. Just did complete tune up. Any ideas ?
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Old 04-13-2012 | 07:03 PM
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Did it knock before tune-up?
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Old 04-13-2012 | 07:15 PM
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From: Seal Beach, CA
Year: 1996
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Engine: 4.0 HO Straight Six
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Originally Posted by Firestorm500
Did it knock before tune-up?
If not, was an oil/oil filter change included in this tune up? If so, what kind of oil filter did you use?
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Old 04-13-2012 | 07:20 PM
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Knocked before but I don't think as loud. Change oil to 15 w 40 with promotive oil filter
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Old 04-13-2012 | 07:34 PM
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Is it knocking at idle or when the engine is at a higher idle? Is the knock a deep thumping knock or is it kind of a quick tingy rap?
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Old 04-13-2012 | 07:37 PM
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At idle and seems to be more of a tingy
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Old 04-13-2012 | 08:09 PM
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From: Riviera, Texas
Year: 1998 Sport
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Hate to say it but you may be one your way on throwing a rod bearing.
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Old 04-14-2012 | 03:06 AM
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Originally Posted by stang23456
Knocked before but I don't think as loud. Change oil to 15 w 40 with promotive oil filter
I believe I would go back to 10W-30 with a Wix or NAPA Gold filter. Your oil is a little thick.
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Old 04-14-2012 | 03:16 AM
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Originally Posted by Firestorm500
I believe I would go back to 10W-30 with a Wix or NAPA Gold filter. Your oil is a little thick.
x2, or even 10w40. Might also try a quart of marvel mystery oil on your next change.

Have you tried listening to tell where the knock is coming from? Loose torque converter bolts can make a knocking sound...
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