Jk 3.8 engine noise??????

check your manifold for cracks, mine sounded a little like that and I found both manifolds had large cracks in them
 
My passenger side manifold cracked between the 2 cats. It was definitely a ticking sound.
Might be able to get it replaced for free under the federal emissions warranty if it is the piece that has the catalytic converter. The warranty is for 8 yrs or 80,000 miles.
I had mine replaced for free.
 
I will pull the heat shied and take a look im hoping that is the issue, seems like a lot of jks have that issue. Thanks for all the help
 
So I pulled the heat shields just now and there are no cracks on the exhausts

I'm just hoping it's not something major

Any thoughts on what could be causing this noise?
 
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Sounds like an exhaust leak of some type. You can buy a stethoscope from an auto parts store and try to find the leak.
 
Anywhere where there is a seam or bolts. Also check where the manifold connects to the head. A stethoscope should find it rather quickly if it is an exhaust leak. Check for broken manifold bolts too.
 
Wouldnt hurt to try it. Very well could help id an exhaust leak and clean your valves at the same time :) Stuff smokes like a freight train lol
 
Jeeper125 said:
Would doing a sea foam treatment expose any leaks because of all the smoke it produces.
Click to expand...

I can't imagine that sea foam is good for any vehicle that still has a decent catalytic converter. As expensive as the cats are and all, it can't be any good for them.
 
JeepJeep75 said:
I can't imagine that sea foam is good for any vehicle that still has a decent catalytic converter. As expensive as the cats are and all, it can't be any good for them.
Click to expand...
after i drained my tank because i had water in the fuel i used 2 cans of seafoam with 5 gals of gas and had no issues, that was 5 months ago and I haven't had any issues
 
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