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Old 05-01-2011, 07:20 PM   #1
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need help. helping a coworker, his jeep sounds like a sowing machine

my coworker has a 99 sahara. with 70k miles on it. his engine sounds like a sowing machine. tapping noise that is there at idle and goes faster with rpm. till you hit around 3000 rpm then it goes away. when it goes back to an idle itll be quiet for about 20 seconds and you will here a slight tapping, and within 45 seconds its just as loud as it was before...

any sugestions? oil pressure is great. 35 at idle and 50 at 3000 rpm. little of a rough idle when noise is there. no engine light,

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Old 05-01-2011, 07:27 PM   #2
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what motor is in your friends jeep the I6 have a ticking noise that is always there mine has 142k on it and has always made the ticking noise

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Old 05-01-2011, 07:34 PM   #3
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yea its the 4.0 this engine was quiet as his audi, and now its louder then my tj with a full exhaust. this is not a normal ticking noise. my four banger tj had lifter ticking that was bad but not like this.
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Old 05-01-2011, 07:40 PM   #4
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my 4.0 has the tick. it was diagnosed as normal piston slap. ive left it alone . they said theres nothing wrong. does it go away with operating temp?
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Old 05-01-2011, 07:43 PM   #5
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no its there all the time.. i wana take the valve cover off and measure the rocker travel i think a lifter may of failed
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Old 05-01-2011, 07:55 PM   #6
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that very well could be. doesnt nessecarily sound like a berring or anything like that to me. may be a piston slap sarting or your lifter
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Old 05-01-2011, 10:29 PM   #7
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Same for me

My 05 Rubicon has started this ticking recently and the dealership said it was in the engine and want to sell me a new engine for $8K. Not going to happen. My son is driving it right now and it is coming back from San Antonio tonight. I am going to change cars with him so I can figure this out. Worst comes to worst I will look at the LM7 conversion. This Jeep has had the oil changed religiously every 3K miles and only has 95K miles on it. My last Jeep is still on the road with over 200K on it. I always want a Jeep around for a fall back vehicle.
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Old 05-02-2011, 02:02 PM   #8
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These are going to sound like dumb questions, but I'm going somewhere - when was the last time your friend changed his oil and what oil did he use?

I used Royal Purple in my jeep because I had always used it in my '71 Mustang with good results. A little while after that oil change, I noticed the exact same sound you're describing. I thought it was the exhaust manifold but couldn't find any cracks. I pulled the valve cover and nothing looked out of the ordinary.

I decided that before going crazy on a new manifold or taking it somewhere, I'd at least change the oil (and by this time, it getting to need changing anyway). I went with Valvoline Max Life (my jeep has 80k miles) and a Mobil 1 filter. I let the old oil drain out FOREVER too.

No kidding - 5 miles after changing the oil, I noticed the noise was noticeably reduced....and 30 miles in - it's gone.

Might wanna give it shot before your friend goes too crazy replacing stuff. $30 for something the jeep was going to need soon anyway was money well spent.
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Old 05-02-2011, 04:51 PM   #9
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Tell your friend to get under the Jeep while its running and feel along the exhaust manifold to find where its leaking.
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Old 05-02-2011, 08:20 PM   #10
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That is a good idea! I forgot that I think these Jeeps have a spring connection from the manifold to the leadoff. Please some one correct me if I am wrong.
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Old 05-03-2011, 12:21 PM   #11
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Not sure what you mean by a spring connection?
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Old 05-04-2011, 12:16 AM   #12
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I will check tomorrow. It's been raining here. In some past experience (way past) leadoffs were some times held to the manifold with a bolt/spring/nut arrangement. I don't know if this is the case here. I will check.
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Old 05-04-2011, 07:52 PM   #13
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There are no springs on a TJ exhaust, all nuts and bolts...
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Old 05-04-2011, 08:10 PM   #14
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You are right! I have tinnerman nut clips and bolts. They are loose. I can move them back and forth.

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