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Old 05-29-2010, 07:43 AM   #1
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Noise when accelerating??

This one is really getting to me.

I have a '98 TJ, 4.0 L, 115K miles.

When accelerating hard, like in first or second entering a highway....engine sounds normal until RPMs get to just under 3000, then a loud noise best described as something between a chatter and a roar sets up, sounds like under the vehicle in the engine area. As soon as I let off and RPMs drop, noise quits.

Never hear it any other time, just when loading it up at 3000 RPMs. Engine in good shape otherwise, had an easy life.

Any ideas? Surely someone else has dealt with this....you would know it!

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Old 05-29-2010, 11:57 AM   #2
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Anybody?

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Old 05-29-2010, 12:07 PM   #3
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Do you get any noise at all just idling?
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Old 05-29-2010, 12:23 PM   #4
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No....no abnormal engine noises at any time other than what I described at 3000 RPMs.
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Old 05-29-2010, 12:24 PM   #5
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Only under load?
Or can you duplicate the sound in park at those RPM's?
If it does it in park Get under the Jeep while somone accelerates the rpm's.
Make the the jeep is secure.
This way you can pin point where the sound is coming from.
If it is only under load I would start with checking: U-joint's,Trans. mount,rear centering pins,fluids in the cases. Take your time. Get it up on jack stand's and make sure nothing is loose.
Goodluck let us know what you find.
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Old 05-29-2010, 12:34 PM   #6
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I just revved it up on the driveway to 3000 RPMs.....had the noise to a lesser degree at about 2000, but not as severe.

I've been investigating another noise that I thought was unrelated. It is a random pop/thud type metal on metal noise that I haven't been able to pinpoint. I just recently became suspicious of the catalytic converter having loose material moving around. Is it possible the engine under load at a certain RPM sets up the chatter/roar I described above (in the catalytic converter)?
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Old 05-29-2010, 01:18 PM   #7
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While driving it get it to make the sound and then hit the clutch (or put it in neutral). Does the sound go away? If it does not then I would say it is a t-case / drive shaft / axle problem. If it goes away then it is likely a transmission / engine problem. (just trying to better focus on where to start looking)
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Old 05-29-2010, 02:25 PM   #8
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While driving it get it to make the sound and then hit the clutch (or put it in neutral). Does the sound go away? If it does not then I would say it is a t-case / drive shaft / axle problem. If it goes away then it is likely a transmission / engine problem. (just trying to better focus on where to start looking)
If I take off in 1st and get to 3000 RPM and it's making the noise, I let off, hit the clutch, and shift to second and the noise quits as soon as I let off, not particularly when I hit the clutch. So the answer to your question is yes....but I'm not holding 3000 when I hit the clutch.

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Old 05-29-2010, 04:47 PM   #9
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Fan hitting the shroud under load?

You should be able to see wear marks or signs of it on the shroud and/or fan.
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Old 05-31-2010, 07:52 PM   #10
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Fan hitting the shroud under load?

You should be able to see wear marks or signs of it on the shroud and/or fan.
Thanks....I checked the fan and shroud.....no marks of any kind.

I'm taking it to the Jeep house Monday....cha-ching.
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Old 05-31-2010, 07:57 PM   #11
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Thanks....I checked the fan and shroud.....no marks of any kind.

I'm taking it to the Jeep house Monday....cha-ching.
Let us know what you find out.. Good Luck..
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Old 05-31-2010, 07:58 PM   #12
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Today I took my Jeep in to the Jeep dealer. Reputable people, good service dept. Of course, they are expensive.

I had the mechanic that was going to do the work riding with me. I produced the noise I have described at 3000 RPM. He said something like "Hmmmm....sounds like maybe some engine run-out." Then we started talking about something else and I never got back around to having him explain "engine run-out"

Can someone clue me in what he was talking about? thx
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Old 05-31-2010, 10:18 PM   #13
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is there any vibration that comes with this noise?
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Old 05-31-2010, 10:41 PM   #14
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No vibration.....just noise.
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Old 05-31-2010, 11:46 PM   #15
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Could just be a simple exhaust leak. My 97 does it. I just got it not too long ago and it had always been babied. First trip out to the mud and I had her up in the higher RPM's and guess I knocked loose some of the rust that had been sealing the exhaust manifold. If the previous owner or yourself did any exhaust work to it and used those band clamps, they are notorious for leaking under a load.
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Old 06-01-2010, 08:33 AM   #16
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Could just be a simple exhaust leak. My 97 does it. I just got it not too long ago and it had always been babied. First trip out to the mud and I had her up in the higher RPM's and guess I knocked loose some of the rust that had been sealing the exhaust manifold. If the previous owner or yourself did any exhaust work to it and used those band clamps, they are notorious for leaking under a load.
Now, that could very well be! Hadn't even thought of that....and in a way I hope it is that and not something internal. There hasn't been any work I know of to the exhaust or manifold by the previous owner or myself. When I hear from the shop, I'll let y'all know.....about this and the other "ailments" they are investigating.
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Old 03-21-2011, 08:47 PM   #17
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Same Problem!! Need HELP!

Hi,
I have this exact same problem on a 2007 Wrangler Unlimited I just bought 2 weeks ago and I have no idea what to do. I found on a different website that someone said to you better gas, even though it's rated for 87, is that really the problem?? What did the dealership tell you? Mines at the shop now and i would love to find a solution I could do myself instead of paying for repairs on the car I just bought!!! Grr.
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Old 07-20-2013, 12:34 PM   #18
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Now, that could very well be! Hadn't even thought of that....and in a way I hope it is that and not something internal. There hasn't been any work I know of to the exhaust or manifold by the previous owner or myself. When I hear from the shop, I'll let y'all know.....about this and the other "ailments" they are investigating.
Did you ever find out what the problem was? I'm having the same issue with my 98 4 banger that just hit 100k last week. Just had the catalytic converter replaced under warranty last week and a new cat back to go along with it..I'm hoping its just an exhaust leak, it's at the shop and my mechanic has no clue what it could be. Also just had the oil pump replaced, and the timing chain. Same noise at 3000 rpms when accelerating, very agitating sound as if the jeep was wheezing
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Old 07-20-2013, 03:14 PM   #19
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I'm hoping its just an exhaust leak, it's at the shop and my mechanic has no clue what it could be.
If a mechanic at an actual "shop" can't run some smoke through the system to determine the exact location of your leak I would be skeptical of their ability in general. No offense meant.
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Old 07-23-2013, 08:06 PM   #20
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If a mechanic at an actual "shop" can't run some smoke through the system to determine the exact location of your leak I would be skeptical of their ability in general. No offense meant.
Who knows if its a leak, I was just hoping it was because I'm tired of throwing money at this jeep. Keep in mind I just had the oil pump replaced, which is still running low pressure, so it could be something with the oil system, but its not getting fixed any time soon. Just picked up the jeep from the mechanic because it's been untouched and sitting in the back of the lot for a week now
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Old 07-23-2013, 10:02 PM   #21
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The oil pump doesnt create pressure. All it does is make oil flow. Oil pressure is created from the clearances between all the moving parts in the engine. Replacing the oil pump will not fix your low pressure problem. If youve checked that the oil sender unit is good then your rod bearings, crankshaft bearings or camshaft bearings is worn down to where its letting too much oil pass through.

As for the noise, if u have a manual transmission it may be the rear mainshaft bearing going bad. It'll make a growling or clackling bearing noise whenever you are accelerating in all gears

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