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Old 06-28-2007, 12:29 PM   #1
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Engine knocking???

I have a 95 Wrangler with 186,000 miles on it and recently there has been a knocking that starts when the engine get's warmed up. When i speed up the knocking get's faster, slightly lowder, and when I slow it slows down and goes back to a low knock. Anyone have any ideas as to what this could be??

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Old 06-28-2007, 01:11 PM   #2
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Are you getting any other symptoms? Loss of power? You probably have a loose lifter. Use a stethoscope to see exactly where the sound is coming from. If it's coming from the valve cover, then I would think it was a loose lifter. I'm sure others will be along soon with their 2 cents as well.

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Old 06-28-2007, 01:20 PM   #3
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Are you getting any other symptoms? Loss of power? You probably have a loose lifter. Use a stethoscope to see exactly where the sound is coming from. If it's coming from the valve cover, then I would think it was a loose lifter. I'm sure others will be along soon with their 2 cents as well.
x2. Get a long screwdriver, use it as a stethescope, and see where the noise is coming from. Report back!
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Old 06-28-2007, 02:25 PM   #4
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exhaust leak at the manifold. check for loose or missing bolts.
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Old 06-28-2007, 08:16 PM   #5
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Originally Posted by jeeper95yj View Post
I have a 95 Wrangler with 186,000 miles on it and recently there has been a knocking that starts when the engine get's warmed up. When i speed up the knocking get's faster, slightly lowder, and when I slow it slows down and goes back to a low knock. Anyone have any ideas as to what this could be??
Lifters make more of a ticking sound. Rod knock is a deeper repetitive KNOCK that will keep pace with acceleration. Check it from the top and bottom. Rod knocks are easily heard from underneath at the oil pan. Either way get it fixed quickly!
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Old 06-29-2007, 01:21 AM   #6
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Unhappy That's It!!!!!

A tapping sound, repetative, but not a knocking, more of a tapping, but it does get faster with acceleration. Althought there is no loss of power. I did have my oil pressure shoot up and stay up for a while. Dropped some Marvel Mystery oil in there and it brought the pressure down. But when the pressure whent up, that's when the whole ticking thing started. Any advice on how to fix the lifters myself? We are poor right now. I just moved to NJ, am unemployed right now looking for a job, with a little bit of savings, not much.
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Old 06-29-2007, 01:36 AM   #7
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Exclamation Cd-2

Does anyone recomend this? It's an oil detergent that's supposed to unstick lifters???
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Old 06-29-2007, 06:27 PM   #8
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There is a check valve inside the lifter, which is a steel ball and spring. The springs go bad and that's usually where the noise will come from. I don't think that you have a stuck lifter, I think you have the opposite problem. So I don't think that the Cd2 will help you.

When the springs go soft, they have a problem holding oil in the lifter, which could also be the reason why your oil pressure went up. Your best bet is to have it checked by a professional. You could cause more harm than good by doing something incorrectly.
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Old 06-29-2007, 07:53 PM   #9
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You know,

I think your right about the rod, I got underneath and could still hear it. Tried the screwdriver stethascope thing, pretty neat, thought you guy's were screwing around

Thanks for all the help!
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Old 07-02-2007, 05:58 AM   #10
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We don't screw around here mister........ok maybe a little.
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Old 07-02-2007, 11:26 AM   #11
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Knock

Try disconnecting plug wires one by one. It will miss but if the knock stops it is probably a rod bearing. Wear rubber gloves or use a insulated tool. This will also identify which cylinder.
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Old 10-01-2010, 02:28 PM   #12
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Try disconnecting plug wires one by one. It will miss but if the knock stops it is probably a rod bearing. Wear rubber gloves or use a insulated tool. This will also identify which cylinder.
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ok, so i see this is a way old thread (thank you search) but have to ask...what happens if the knock doesn't stop when you pull the wire? Jeep knocked when i bought it. replaced the plugs, cap, rotor button, timing chain, water pump, and harmonic balancer. just seafomed the engine and changed the oil last night and it still knocks. tried the spark plug idea, and still knocked. only knocks when idling. knock goes away when under load. they only other think i can think of doing without digging into the engine is drop the oil pan and see what lies inside.

but before i do this, i am hoping someone may be able to comment as to their opinions.

yes, i have read on many other threads and boards that this is just a jeep thing and they all do this. i am more than willing to accept this answer as well, but i want to be sure before i do.

thanks,
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Old 10-01-2010, 02:43 PM   #13
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Rod bearing or piston skirt busted
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Old 10-01-2010, 03:10 PM   #14
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thanks big, is this something i can see when pulling the oil pan? the engine power is still great so i assume i'm not doing any permanent damage here??
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Old 10-01-2010, 03:16 PM   #15
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Man I dunno sounds like the damage is done. I have one right now (4.2) that is doing the same thing. What's your oil pressure doing during all of this? Mine goes up and down like a tach instead of staying constant. Usually if a bearing is failing you will have metal in your oil filter...you can cut it apart and check that. I am gonna sell mine for a core when I cut the jeep up
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Old 10-01-2010, 03:26 PM   #16
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oil pressure stays at 50 when on the move and drops to just below 40 when stopped. and like i said, the performance, acelleration, etc, is great. i stuck a magnet in the filter last night when i changed the oil but didn't pull out any shavings......so, i'll just drop the pan when i do the next change and see what i can see.

i have done a google search on this and probably read 30 different articles from "your engine is ruined" to "it's a jeep thing, get over it." so???? we'll go from here i guess. thanks again!
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Old 10-01-2010, 03:34 PM   #17
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Your gonna have to cut the filter open to really tell...the bearings are aluminum or copper
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Old 10-01-2010, 03:37 PM   #18
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ok will do. probably do that this weekend and see what's inside.
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Old 11-17-2010, 08:13 PM   #19
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Man I dunno sounds like the damage is done. I have one right now (4.2) that is doing the same thing. What's your oil pressure doing during all of this? Mine goes up and down like a tach instead of staying constant. Usually if a bearing is failing you will have metal in your oil filter...you can cut it apart and check that. I am gonna sell mine for a core when I cut the jeep up
My oil pressure also goes up and down like a tach, makes the pinging sound pretty loud until it gets warmed up. Once it's warmed up the pinging seems to go away for awhile. If I shut the engine down for a few minutes, then start back up, the pinging is back.

I'm also confused where to start looking for the cause.

Any further suggestions?

Thanks
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Old 11-17-2010, 10:33 PM   #20
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Dunno if I'm on the right track or not but the tapping when you first start it up sounds like a hydraulic lifter
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Old 11-18-2010, 01:51 AM   #21
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exhaust leak at the manifold. check for loose or missing bolts.
Had the same problem, noise was exactly how he described. Pretty easy fix.
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Old 11-18-2010, 06:55 AM   #22
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i hav e a 2.5 cyl and i got a good rod knock it goes with the rpms and the oil pressure is everywhere. would it hellp if i changed the crank and rod bearings??

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