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Old 11-03-2009, 11:51 PM   #1
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Rattling/tapping sound in/near engine bay?

I've noticed lately while driving my new Jeep an odd sound...I'm unsure as to whether it changes with RPMs or driving speed, but wondered if you folks may have an idea of what it is (may even be perfectly normal for the 4.0L...just not something I'm used to from my truck).

It's not a loud sound...with the radio up even just a little bit, windows up, or a/c or heat on, you can't hear it. If nobody here knows for sure what it is (ie not a common noise), I'll ask the service guys one day at work when they have a minute to check it out.

Basically what it sounds like is just a very light but rapid tapping noise...
It basically sounds like the stun gun in this video...no it's not my video...but the sound reminded me of a stun gun I once had and this is the closest sounding stun gun I could find.



I also poked my head under the hood one day and I don't notice any odd rattling sounds...nothing that suggests any engine-related problems anyway.

Thanks for any help!

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Old 11-03-2009, 11:55 PM   #2
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Does it make this noise also while parked and running? = lifter tap.

If only while moving check and make sure the shocks are tight up top.

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Old 11-03-2009, 11:57 PM   #3
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Quote:
Originally Posted by s3nt3nc3d View Post
I've noticed lately while driving my new Jeep an odd sound...I'm unsure as to whether it changes with RPMs or driving speed, but wondered if you folks may have an idea of what it is (may even be perfectly normal for the 4.0L...just not something I'm used to from my truck).

It's not a loud sound...with the radio up even just a little bit, windows up, or a/c or heat on, you can't hear it. If nobody here knows for sure what it is (ie not a common noise), I'll ask the service guys one day at work when they have a minute to check it out.

Basically what it sounds like is just a very light but rapid tapping noise...
It basically sounds like the stun gun in this video...no it's not my video...but the sound reminded me of a stun gun I once had and this is the closest sounding stun gun I could find.



I also poked my head under the hood one day and I don't notice any odd rattling sounds...nothing that suggests any engine-related problems anyway.

Thanks for any help!
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Old 11-04-2009, 07:49 AM   #4
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It sounds like it's the infamous Jeep engine tap. I believe most people have this tapping noise and some have traced it down to a few different areas, most which lead to the coming from just above your oil filter and a Position Senor
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Old 11-04-2009, 08:46 AM   #5
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Quote:
Originally Posted by distortedtj View Post
Does it make this noise also while parked and running? = lifter tap.

If only while moving check and make sure the shocks are tight up top.
I don't seem to notice it while idling at a stop...not to say it doesn't exist, it's just so light I don't know if I could hear it anyway. It doesn't sound like any lifter tap to me...just a real rapid tap tap tap tap tap tap constantly while moving down the road. But it's very faint...not obnoxious or anything.


Quote:
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It sounds like it's the infamous Jeep engine tap. I believe most people have this tapping noise and some have traced it down to a few different areas, most which lead to the coming from just above your oil filter and a Position Senor
So if that's what this tapping noise is, it's perfectly safe to drive it this way and not have to worry about anything blowing up or falling off? lol
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Old 11-04-2009, 08:54 AM   #6
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open your hood, look on the right side of the engine bay on top of your fender. There is a little vaccum vavle that tap, tap, tap, tap, taps. Check and see if this is what your are hearing. If not you might have a small exhaust leak on your manifold.
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Old 11-04-2009, 01:14 PM   #7
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I have an 06 4.0L, and notice a very similar sound. Mine is a much faster "ticking" sound. It seems to be the most noticeable right at 2000 RPM's. I do notice mine at idle, however it's not nearly as loud and is a much slower "tick". Is this a normal thing for a Wrangler? This is the only one I have ever driven, but I was going to hit a couple of dealerships and test drive a couple to compare. It's driving me nuts!
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Old 11-04-2009, 02:06 PM   #8
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I have an 06 4.0L, and notice a very similar sound. Mine is a much faster "ticking" sound. It seems to be the most noticeable right at 2000 RPM's. I do notice mine at idle, however it's not nearly as loud and is a much slower "tick". Is this a normal thing for a Wrangler? This is the only one I have ever driven, but I was going to hit a couple of dealerships and test drive a couple to compare. It's driving me nuts!
could it be some "arching" ? check at night
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Old 11-04-2009, 07:16 PM   #9
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Quote:
Originally Posted by Moemilly View Post
I have an 06 4.0L, and notice a very similar sound. Mine is a much faster "ticking" sound. It seems to be the most noticeable right at 2000 RPM's. I do notice mine at idle, however it's not nearly as loud and is a much slower "tick". Is this a normal thing for a Wrangler? This is the only one I have ever driven, but I was going to hit a couple of dealerships and test drive a couple to compare. It's driving me nuts!
That's like what I hear...very noticeable around 2000 RPMs. Similar to the above video in sound...but rapid and constant right?
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Old 11-04-2009, 07:49 PM   #10
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again I would check for any briken spark plug wire at night, if it's arching somewhere you'll see it. on one of my bike I had a similar sound, and found a slightly broken plug wire. or it could be the boot not sealing properly some electrolyte (spelling?) "grease" would help
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Old 11-04-2009, 08:44 PM   #11
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Quote:
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again I would check for any briken spark plug wire at night, if it's arching somewhere you'll see it. on one of my bike I had a similar sound, and found a slightly broken plug wire. or it could be the boot not sealing properly some electrolyte (spelling?) "grease" would help
Hrmmm...that does make sense as that's exactly what it sounds like, an electrical arching sound. I'll have to check that out when I get home this evening. Might also explain why it's got a slightly rough idle...almost feels like a a very slight miss at times (usually only notice it at idle).

How do you change the plugs/wires on a 2002 Jeep? Never done it before...looks like there's some kind of cover over that side of the engine...remove that and easy access to plugs and wires? Are the wires standard wires or they the short little boots that directly connect the plugs to coil packs?
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Old 12-26-2009, 05:09 AM   #12
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I'll bet money it's your coil pack/bar on top of the plugs. One of the rubber boots is bent when it was last installed and now it's arching. Like LOIC said, check at night. You'll see exactly which plug/boot.

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