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Apr 13, 2012 | 05:35 PM

stang23456

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Joined: Mar 2012

Posts: 166

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From: Port Orange,FL

Year: 1999

Model: Cherokee

Engine: 4.0

Knock

Hearing small knock coming from motor with 140 k miles. Just did complete tune up. Any ideas ?

Apr 13, 2012 | 06:03 PM

Firestorm500

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Joined: Apr 2009

Posts: 4,734

Likes: 12

Year: 2015, 2012

Model: Grand Cherokee (WK2)

Engine: 3.6L

Did it knock before tune-up?

Apr 13, 2012 | 06:15 PM

ZINGGG

CF Veteran

Joined: Oct 2011

Posts: 4,440

Likes: 3

From: Seal Beach, CA

Year: 1996

Model: Cherokee

Engine: 4.0 HO Straight Six

Quote:

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?

Apr 13, 2012 | 06:20 PM

stang23456

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Joined: Mar 2012

Posts: 166

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From: Port Orange,FL

Year: 1999

Model: Cherokee

Engine: 4.0

Knocked before but I don't think as loud. Change oil to 15 w 40 with promotive oil filter

Apr 13, 2012 | 06:34 PM

Wiclassic

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Joined: Oct 2011

Posts: 132

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From: Franklin, Wi

Year: 1999

Model: Cherokee

Engine: 4.0

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?

Apr 13, 2012 | 06:37 PM

stang23456

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Joined: Mar 2012

Posts: 166

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From: Port Orange,FL

Year: 1999

Model: Cherokee

Engine: 4.0

At idle and seems to be more of a tingy

Apr 13, 2012 | 07:09 PM

RTorrez1

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Joined: Sep 2011

Posts: 4,172

Likes: 4

From: Riviera, Texas

Year: 1998 Sport

Model: Cherokee

Engine: 4.0

Hate to say it but you may be one your way on throwing a rod bearing.

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Apr 14, 2012 | 02:06 AM

Firestorm500

CF Veteran

Joined: Apr 2009

Posts: 4,734

Likes: 12

Year: 2015, 2012

Model: Grand Cherokee (WK2)

Engine: 3.6L

Quote:

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.

Apr 14, 2012 | 02:16 AM

sthon

CF Veteran

Joined: Mar 2011

Posts: 2,570

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From: California

Year: 1992

Model: Cherokee

Engine: 4.0 HO

Quote:

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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