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Old 02-26-2014, 11:11 PM   #1
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Ticking/knocking at times on startup :(

I'll have to get a recording of it, but when its cold and randomly at other times it makes a good squelch and then loud ticking. Some times its like a knocking which is scary Some times it does it only for a few seconds, others it will do it till I rev it or drive it or restart it, and some times not at all

Think it's just the lifter/cam or a piston skirt (or both!)?? I just changed the oil and it seemed fine, got a bit dark quickly, but not to bad. I should have stuck a magnet in the oil pan and checked if I could fish anything out, cant remember what piston is made of though?

I put Restore engine restorer in it this oil change and it has quieted it down a lot (makes it go away much fast so far), but it still does it after sitting overnight or a while at times. I've tried different filters and oil but it doesn't make a difference. Gas mileage sucks too, though my driving style doesn't help that any! Jeep only has ~73k miles on it.

I have the stuff to do the rear main and oil pan which is leaking a bit, but since snugging the rear pan bolts its not too bad now, so I am saving that for warmer weather (and the clutch which has oil on it!) I don't know if I should save and wait and tear the upper engine down too and replace the cam/lifters while I'm at it? Or do the pan/rms/clutch when warmer and hope not to find pieces in the pan of the pistons!

Sorry for the novel, just worried about this. The Jeep has been a money pit since I got it, issue after issue I shouldn't be having.

Any easier ways to check better without tearing it apart? Probably not eh?

Thanks for any help or advice in advance

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Old 02-26-2014, 11:23 PM   #2
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Mine does the same when it's sub freezing. Goes away in a minute or two. Doesn't do it when warm out but has a slight tick. I dont think it's anything to be concerned about. My friends jeep ticks also as did my yj

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Old 02-26-2014, 11:32 PM   #3
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Aiy, I've read a lot about it and it does seem common for a light tick, but this is quite loud at time (can be heard inside the house), and does sound like a knocking at others. I can't tell always when it's going to do it either, more so when cold, but has done it when warm last year etc too...
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Old 02-27-2014, 01:31 AM   #4
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I don't know if this is your issue, but when I got my jeep I changed the oil, and was getting a bad sound the first few seconds. After researching, I realized it was because the cheap oil filter I used didn't have an anti drain back valve, and was causing that 'dry start' sound. I went to a better filter(made sure it had one) and I haven't heard that sound since. Mine was always really quick though, like a half second right at start up.
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Old 02-27-2014, 07:54 AM   #5
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I've tried 4 different filters now, running Wix ones at the moment. All seem the same. That was one of the first things I tried.
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Old 02-27-2014, 07:57 AM   #6
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You have an I6 4.0L engine, don't you? Its ancestors, I believe, were Singer sewing machines and they make that noise when its really cold outside. Get used to it, I did.
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Old 02-27-2014, 08:11 AM   #7
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This is much much more than a light ticking when it does it
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Old 02-27-2014, 09:10 AM   #8
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believe it or not its probably an exaust leak, you most likey have a cracked manifold, when it warms up quick it goes away, cracked manifolds are very common with the inline 6, ide look that rout if I was you
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Old 02-27-2014, 09:54 AM   #9
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I found that the timing chains and gears on these where the problem on the 4.0 that had the ticking and would go away. Cheap to replace and noise can be found with stethoscope.
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Old 02-27-2014, 09:55 AM   #10
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good idea. cracked manifolds are very common with the inline 6, ide look that rout if I was you
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Old 02-27-2014, 09:59 AM   #11
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I have a ticking with mine at start up that kicks in after idling about 3 min. Mine seems to be coming from around the TB though.
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Old 02-27-2014, 11:15 AM   #12
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I really don't think it's an exhaust leak, especially with the loud squelch it makes at times before hand. I've never heard an exhaust leak this loud (when it did the loud knocking a few times, I could hear it inside the house easily, and even the ticking I can hear inside the front door!) It does it in the warm or cold, just more in the cold so far. It's the newer 2 piece manifold on it which I thought were far less prone to leaking than the early ones? (it's an '04.) I think I'm going to have to tear into it once the weather is warmer
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Old 02-27-2014, 11:26 AM   #13
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I had two remans do this and found that ATK cuts corners by using the same sprockets and sometimes the same chains. Just an FYI

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