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post #1 of (permalink) Old 09-04-2006, 06:54 PM Thread Starter
 
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ticking getting more noticable

Been gone for a while, but of course a new noise has prompted concern over the health of my engine and I have come back seeking the knowledge of those who seem to know(that's you people). My 02 TJ has 85000 plus on the 4.0L. It had 52000 when I bought it in the summer of 05 and I have changed the oil religiously. I havent had any problems yet, but I have noticed recently that there is an audible ticking when Im idling. The engine noise beyond idle is too much to tell if it gets worse or goes faster. It sounds to me a lot like a lifter ticking, but I know just enough to know I usually dont know what Im talking about. [img]/ubbthreads/images/graemlins/confused.gif[/img]
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post #2 of (permalink) Old 09-04-2006, 08:36 PM
 
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Re: ticking getting more noticable

Try to determine, with a mechanics stethoscope, if you have one, where the noise is coming from, if you have an automatic transmission, try to see if it's coming from the inspection cover just behind the oil pan. Recently, this happened to my Cherokee, drove me nuts, I thought it was a rod out of tolerance at first. It turned out to be the four bolts that connect the flexplate to the torque converter. All four had backed themselves out over the years, and one of them was ticking on a small indentation in the inspection cover. Sounded a lot like the engine, until I put the stethoscope on it.
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post #3 of (permalink) Old 09-04-2006, 09:29 PM
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Re: ticking getting more noticable

Bet you a dollar it is an exaust manifold leak. Is it diffrent when first starting than running for a while?

I have one so bad when I start it I routinly get people asking if it has oil in it till it warms up. [img]/ubbthreads/images/graemlins/smile.gif[/img]

Mine is cracked and when it heats up the crack closes. Bout 2 min of running.

I am getting a header soon. But I have other issues to deal with right now.

Good luck franco!!
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post #4 of (permalink) Old 09-06-2006, 10:16 PM Thread Starter
 
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Re: ticking getting more noticable

Ive got a 5spd and I dont have a stethescope, but its definitely under the hood. When I stick my head under there it sounds like its towards the rear of the compartment-which means it could still be a lifter or something ticking, an exhaust manifold leaking, or God knows what. I tried the screwdriver to my ear trick, but didnt really make it conclusive.
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post #5 of (permalink) Old 09-06-2006, 10:23 PM Thread Starter
 
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Re: ticking getting more noticable

Thanks for the response, Im not sure but I cant see any soot anywhere around any of the exhaust manifold area, but that doesnt mean it isnt leaking. It does seem to get quieter after a little bit, but sometimes it doesnt make the sound at all after start up. Im no master wrench, but it really sounds mechanical-like lifter/valve noise. Is there some way to find out other than to replace the manifold gasket and try and listen again after the swap? Im sure the gasket is pretty cheap anyway, but Im a little lazy and would LOVE to find the answer before I dive in blindfolded. By the way, how's everything going? We really wanted to go to Indiana last time, but just couldnt get it done. Anything coming up in the future? we'd really like to see everybody again. I'll talk to you later [img]/ubbthreads/images/graemlins/smile.gif[/img]
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post #6 of (permalink) Old 09-06-2006, 10:35 PM
 
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Re: ticking getting more noticable

Exhaust manifold gasket's about 10-15 bucks, depending on the quality of gasket you get, any of 'em will fix up an exhaust leak though. The back studs are a pain. Easier to fix the cheap stuff and eliminate the obvious than tear off the head to search for the ghost of a lifter tick.

And yeah, if you have the 5 speed, you wouldn't have the same problem my cherokee had. Only seems to trouble the 88-02 automatics.
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post #7 of (permalink) Old 09-06-2006, 10:49 PM
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Re: ticking getting more noticable

Try the easy stuff first.....
Take a socket and tighten up the intake and exhaust bolts.....the jeep engine is bad about them comming loose....especially the 4.2L

With experience you can tell the difference between a lifter and exhaust....the sound is similar...it gets more complicated when the exhaust leak is from just one port vs the main pipe....a lifter or single exhaust port will have the same freq while the main exhaust pipe will be 6 times....

Without having experienced both...about the only way to tell (assuming the bolts were tight) is to use a piece of hose and hold it up under the exhaust manifold...if you find the sound with it...it's the exhaust....if not, lifter.....and if it is a lifter....don't worry about it....not worth the effort to fix....the worst damage it's doing is making you concerned about it....
post #8 of (permalink) Old 09-06-2006, 11:05 PM
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Re: ticking getting more noticable

[ QUOTE ]
.....and if it is a lifter....don't worry about it....not worth the effort to fix....the worst damage it's doing is making you concerned about it....

[/ QUOTE ]
Not true. Lifters don’t make noise but if indeed a problem lifter is the cause of the noise, exactly where is that noise coming from and why?
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post #9 of (permalink) Old 09-06-2006, 11:08 PM
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Re: ticking getting more noticable

Bring it by some time and let me listen to it. I can tell you in thirty seconds or less.

Big difference between an exhaust leak and lifter noise is that the exhause leak changes volume in proportion to throttle opening. Lifter doesn't.
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