Odd Engine Noise

[ShadowsPapa]

Here’s some quick perspective on this, because I occasionally hear some odd noises when accelerating. The JT is small, not insulated like a full size truck, and is somewhat of an oddity in that the exhaust outlets on the drivers side. Most single outlet exhausts on are the passenger side unless dual. Why the JT is driver I don’t know, but that will absolutely play a factor in the type of noises you hear against sound barriers or at the drive through.

Most of my cars have been driver side exhaust outlet. But - my Chevy was right side exhaust outlet - pointed to the right, not the rear. The only time I really heard it was when I was on the freeway in the right lane and the exhaust pointed at the concrete barriers.
Odd that my cars were left and that truck right. Not sure what makes them decide other than space under for the muffler, etc.

But yeah, these trucks have all of the things going for it that make the driver hear things they'd never hear from other cars or trucks.

A "ping" that lasts longer than a second or two or more frequently, like hauling a load on the interstate going up an incline - that's bothersome. But a second while cornering at low RPM and applying throttle - won't bother me.

I need to gather some more logs from my truck but I've been doing some experimenting that indicates to me that these things are incredibly adaptable - I'll know more in a few weeks and/or after grabbing some logs, but I've made mine growl a little more at the intake and underneath at the exhaust.

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[arneb04]

Most of my cars have been driver side exhaust outlet. But - my Chevy was right side exhaust outlet - pointed to the right, not the rear. The only time I really heard it was when I was on the freeway in the right lane and the exhaust pointed at the concrete barriers.
Odd that my cars were left and that truck right. Not sure what makes them decide other than space under for the muffler, etc.

But yeah, these trucks have all of the things going for it that make the driver hear things they'd never hear from other cars or trucks.

That is odd. Almost everything I’ve ever driven with single outlet has been passenger side regardless of car, truck or suv. Like the more I think about it, I’m pretty sure this is the only vehicle I’ve had with driver side exhaust. Anyway, yeah couple that with the 6” deep dash and firewall, you hear a lot more going on than a regular truck or car. And a lot less I might add than one might expect if they think about that for awhile…

 

[Fortus]

I had to go replay the video a few times to catch the sound. I've driven my JT with the top off, windows open, top on, windows closed, on steep inclines and flat roads etc. and have never heard that sound before. That is a very strange sound indeed. I can see why it bothers some people.

 

[ShadowsPapa]

Drive late 60s high compression engines on today's regular and you'll hear true ping of detonation and get to know it well and get to know what is acceptable and what isn't.

 

[swazza94]

This is the noise I’m hearing, if I’m driving along and start to hear it I can stay at the same speed and revs and it will last for as long as I let it. Sounds and feel to me like slapping coming from the trans (3.6 auto rubicon) It’s driving me crazy

 

[swazza94]

Brief but loud rattle at the start of the vid

 

[Hipbilly]

Ok yeah two different sounds going on here, I've experienced both.
The "Jangling keys under the hood" sound I only had in once instance, and was related to heavy lugging of my 6MT engine after going up in tire size. That one is covered in the "Rattling engine sound" thread linked earlier here in this tread. It seems to be MOSTLY isolated to manual trans trucks, where lugging is a reproducible and driver controlled condition.

The other one, that I believe OP's video and these two videos show is something different; I notice it the most when my wife is driving and the kid and I are riding in the bed (Its ok, we do it all the time...).. Loosely associated with low RPM/High torque, exacerbated by speed bumps, and sounds a LOT like something loose in the exhaust system rattling when the engine shakes and shimmies.

 

[swazza94]

Ok yeah two different sounds going on here, I've experienced both.
The "Jangling keys under the hood" sound I only had in once instance, and was related to heavy lugging of my 6MT engine after going up in tire size. That one is covered in the "Rattling engine sound" thread linked earlier here in this tread. It seems to be MOSTLY isolated to manual trans trucks, where lugging is a reproducible and driver controlled condition.

The other one, that I believe OP's video and these two videos show is something different; I notice it the most when my wife is driving and the kid and I are riding in the bed (Its ok, we do it all the time...).. Loosely associated with low RPM/High torque, exacerbated by speed bumps, and sounds a LOT like something loose in the exhaust system rattling when the engine shakes and shimmies.

im finding they are the same, if I’m slowly driving along it makes the louder noise and then goes to the quieter noise in the first vid. The both have the same location and feel as well. Just harder to get the full noise and timing in one video

 

[LoJac963]

im finding they are the same, if I’m slowly driving along it makes the louder noise and then goes to the quieter noise in the first vid. The both have the same location and feel as well. Just harder to get the full noise and timing in one video

The noise you posted sounds the same as mine but in a slightly lighter noise. That will occur while just driving. Like you said though, easily replicated over speed bumps or slowing down on a corner and slowly accelerating with cause the noise.

It's insanely annoying and sounds like garbage. I took mine in for a bad aux battery and IBS which they replaced both. I mentioned the sound in depth to them and nothing about it was mentioned on my paperwork. They said the low RPMs was caused by the bad Intelligent Battery Sensor *rolls eyes

 

[ArmyGladiator]

This is just how Jeeps are. Its the lifters rattling around. You can use a thicker oil and a higher octane gas. You can even buy a bottle of octane booster and see if that helps, but its just a Jeep thing. Just drive the hell out of it. However a thicker oil will lube the lifters better and stop the diesel sound.

 

[ShadowsPapa]

This is just how Jeeps are. Its the lifters rattling around. You can use a thicker oil and a higher octane gas. You can even buy a bottle of octane booster and see if that helps, but its just a Jeep thing. Just drive the hell out of it. However a thicker oil will lube the lifters better and stop the diesel sound.

Just how Jeeps are?
Sorry, not the case. In fact ours are quiet enough at idle with the doors closed and windows up we look at the dash to see if we remembered to shut our Jeeps down.
Windows down, stopped, sitting in the garage or next to something, you can hear it running, but hardly noisy.
We've had several Jeep vehicles with the 3.6 and including my current JT - it's not a whisper quiet lifter sound but it's not a "diesel" sound either.

Thicker won't lube better - the "thickness" of the oil is not what lubricates. It's the film strength and that's not viscosity related. In fact, thicker oil (going more than one notch up from spec'd) may make things worse because that same oil handles the VVL and VVT (phasers). I would never take these over 5w30 - there's no reason, for one thing, and thicker won't lube better, and too thick will run hotter and result in LESS lube on cold starts.


Oil pressure is regulated to ~30 psi meaning thicker oil won't increase oil pressure for those stuck in the old world thinking "oil pressure is what protects".
Thicker oil will actually lead to oil "not getting there" as quickly.

Odd how you toss octane and thicker oil in as if they deal with the same issues.
Totally different sounds - lifter noise doesn't come and go with load (maybe with RPM, but not load)
And detonation ping doesn't happen at idle or with no load.
The two are unrelated, and very different sounds, taking place at very different times and under different situations. It's either a lifter noise (which on these is no worse than most others) or it's the ping of detonation. The solutions are different.

I think you're tossing stuff at the wall to see what sticks.

I'd say only my LS engine was quieter, all others sound about the same as my Gladiator engine.
In fact, the stock 4.0 is a more noisy engine and mine is more noisy than the 3.6 because of the more radical cam ramps I have in that 4.0 now.

 

[Maximus Gladius]

Run a can of Sea Foam intake valve cleaner and 2 cans of gas cleaner.

Just did mine at 25k kms then drove it like I stole it. Filled the community with white smoke then stomped on the throttle when I got to the highway. Performance picked right up and it got nice and quiet. Idles very smooth now.

 

[ShadowsPapa]

Run a can of Sea Foam intake valve cleaner and 2 cans of gas cleaner.

Just did mine at 25k kms then drove it like I stole it. Filled the community with white smoke then stomped on the throttle when I got to the highway. Performance picked right up and it got nice and quiet. Idles very smooth now.

Not sure why it would be quieter - not lifter-wise anyway.
But cleaning isn't a bad idea anyway. There's no fuel spraying against the backsides of the intake valves to keep things from building up on them and carbon can and does build up on many engines.
Of course running it hard may be what quieted things down - varnish does form on moving parts exposed to hot oil.
We used to run "combustion chamber cleaner" through engines on a fairly regular basis - almost every couple of weeks someone would come in and Wynn's took care of things (that and a good hard run on the highway west of town)

 

[jeepmojo]

Not sure why it would be quieter - not lifter-wise anyway.
But cleaning isn't a bad idea anyway. There's no fuel spraying against the backsides of the intake valves to keep things from building up on them and carbon can and does build up on many engines.
Of course running it hard may be what quieted things down - varnish does form on moving parts exposed to hot oil.
We used to run "combustion chamber cleaner" through engines on a fairly regular basis - almost every couple of weeks someone would come in and Wynn's took care of things (that and a good hard run on the highway west of town)

 

[jeepmojo]

My rattle is louder than both same though mine sounds like 3 beer bottles tied to a string clacking . Def lifters or rocker arm chatter but not acceptable been complains since I got it about 1000 miles or under . Told me to wait till it’s louder and it is , they even thought might be from manual tranny but said the manuals do it normal . No frickin way am I paying 50 grand for this one just not accepting it I have 10 thousand miles on it now and have been complaining since January . Tons of other issues too I could list here axle shaft replaced, water pump shit the bed water rear window , both doors leaked to carpets , so ping wet. Clank like axle joints when 4wd and think noises from it too like grinding and screwdrivers hitting tin pans . Squeak at drivers rear brake plate against axle . Smell of anti freeze . But this clatter is the worst of it all . I did not pay for a gladiator that’s like this . I will get a attorney at a point if they don’t replace the vehicle or fix it . I’m done with this bs

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