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Old 03-08-2012, 06:07 AM   #1
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engine ticking/knocking sound

Ok, I've got a 98' 4.0L with 190,000 miles. It's got a ticking sound that goes away under load. It carries 40+ oil pressure. I can't tell if it's rod knock or wrist pin or a collapsed lifter. Any suggestions on how to narrow it down?

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Old 03-08-2012, 07:41 AM   #2
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Is it ticking or knocking, they indicate too different problems?
Try Shell straight grade oil, dont use synthetics. Youll be amazed at how much quiter your engine is, and its cheap.

Do you have a coil pack or distrubutor, if I remember its a distrubutor?

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Old 03-08-2012, 05:41 PM   #3
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It's the distributor type. I thought similar about the oil. What do you think about 20W50? I feel it's a ticking sound and I thought it went away under load but it just gets quieter. I'm thinking it's a wrist pin but I just don't want to admit it.
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Old 03-08-2012, 07:15 PM   #4
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Using such oil will solve nothing, sadly enough.

IMHO I would start taking the engine apart and working my way through there.
I know no one wants that, but adding such thick oil will only buy you a bit of time and cause greater damage.

Just my $0.02
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Old 03-08-2012, 10:14 PM   #5
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Another jeeper friend of mine had similar issues and found that his flywheel was cracked.
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Old 03-09-2012, 06:12 AM   #6
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Was it a manual or automatic? I just have a gut feeling it's something other than internal engine failure
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Old 03-09-2012, 06:47 AM   #7
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Sense you got a distributor, you can pull one plug wire at a time and see if it's a piston, and which one.

The noise will stop
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Old 03-09-2012, 07:23 AM   #8
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Quote:
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Sense you got a distributor, you can pull one plug wire at a time and see if it's a piston, and which one.

The noise will stop
Please do this with insulated pliers or your fillings may jump out of your teeth. BTW, the motor will run ruff when you disconnect the wire, but the poster is correct the noise will disappear.
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Old 03-09-2012, 08:25 AM   #9
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Quote:
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Please do this with insulated pliers or your fillings may jump out of your teeth. BTW, the motor will run ruff when you disconnect the wire, but the poster is correct the noise will disappear.
I used to use a pair of plastic pliers out of a kid's toy set. Works great
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Old 03-09-2012, 09:36 PM   #10
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I tried the plug thing and didn't notice any difference. I've always prided myself on knowing engine sounds and been pretty good at figuring them out. But this one's stumping me. I changed the oil to 20w50 and no change in sound. As I drove it today, the word chatter came to mind, It doesn't sound like a rod knock, more of a chattering sound but it gets quieter either accelerating or decelerating. I doesn't matter if the engines cold or hot, the ticking/knocking sound is there.
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Old 03-10-2012, 09:34 AM   #11
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Please do this with insulated pliers or your fillings may jump out of your teeth. BTW, the motor will run ruff when you disconnect the wire, but the poster is correct the noise will disappear.
LOL. dang you had to say something
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Old 03-10-2012, 09:57 AM   #12
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Go to harbor freight and buy a $10 stethoscope. I bought one and it helps me when I need to narrow down the location of a noise.
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Old 03-10-2012, 10:07 AM   #13
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I'm surprised no has said it already, but the 4.0 isn't exactly known for being quiet.
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Old 03-10-2012, 10:11 AM   #14
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^^ That's true but one that's running perfectly shouldn't be making any noises that are noticeable.
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Old 03-10-2012, 10:46 AM   #15
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I had a 91 YJ with a 4.0 that I bought with 67k miles that had a similar noise. Before I bought it, I took it to the dealership and got one of their mechanics to listen to it. He called it piston slap, and I bought it and drove it another 120k miles. I don't know if this is the same thing, but there's the 411.
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Old 03-10-2012, 11:00 AM   #16
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That oil is too heavy.

I have a lifter tick and added Seafoam to some Valvoline high mileage oil and the tick is gone. Took a while. I used 10 30.

I can only assume that I had some build up in my case.

Hard to know what your issue is.
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Old 03-10-2012, 11:25 AM   #17
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A blown exhaust gasket or cracked exhaust manifold will cause a ticking sound. A stethoscope will help isolate.
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Old 03-10-2012, 12:41 PM   #18
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Very true! This is the problem with sound diagnosing over a forum.
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Old 03-17-2012, 07:19 PM   #19
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well, I found my knocking problem. My worst fears were realized. Found a chunk of piston in the oil pan. I'm gonna pull the head and drop in a new piston, but that's it. I hope to do it in a weekend or so.
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