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I've been noticing recently that my XK is sounding like it has a small exhaust leak on the driver's side. When I start it up from cold or after its been sitting for a while, I hear the infamous "chug, chug, chug" of a typical exhaust leak. I can also hear it under acceleration with the windows open, but not when they're closed. The noise also goes away when the engine fully heats up.

I opened the hood today after I started the engine, and it sounds like the noise is coming from the top rear of the engine. I was at work and alone, so I couldn't do a great job of pinpointing the noise. I have had the truck on a lift and felt around the exhaust system, but nothing seems loose anywhere in the system from the manifold/Y pipe flanges back. The manifolds also appear to be solidly connected to the block.

I feel that this is a small leak that goes away through metal expansion, but would like to get it fixed so I don't have the annoying noise! If I wanted to sound like a carbed '78 Ford V8, I'd own one of those! :D I'm going to try to listen around with a length of hose and my wife pressing the throttle so I can find the noise this weekend and try to be a little more precise about this.

Anyone have any thoughts on this?
 

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Although I have not personnaly had this on my 4.7 it seems like several of the 4.7's have had gasket failures at the head/manifold mounting point.
Each one described had one or more mounting bolts break off.

Your description, specifically the 'gets quieter as it reaches operating temperature' lines up with a not fully secured manifold heat expanding a resealing itself.

If your 06 has the lifetime powertrain coverage, it would be a covered repair.

Rob
 

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Discussion Starter #3
robby, thanks for the info, I'll look into that tomorrow. Since mine's an 06, it doesn't have the lifetime powertrain warranty.

Now I need to find a good muffler shop in Alexandria. Any suggestions?
 

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Although I have not personnaly had this on my 4.7 it seems like several of the 4.7's have had gasket failures at the head/manifold mounting point.
Each one described had one or more mounting bolts break off.

Rob

Hi Robby. I came across this old post while searching. I just found out I have two broken bolts on the drivers side of my truck where the manifold meets the head. Is this something I can drive with while I save up the $$
to get it repaired? I noticed it a couple weeks ago and it's behaving just as the above poster's was....quietens down a great deal after warmup.
Thanks
 

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I got my 4.7 2006 about 4 weeks ago and now you guys got me wondering...

When going up a hill or using a lot of power, mine kind of sounds like a heavy duty lawnmower. I think the term to describe it would be "throaty"?

When using a lot of the engine's power and going up a hill or when I really stomp the peddle or am accelerating quickly it kind of sounds like a fast paced "chug chug chug chug..."

I have not driven another v8 commander before so I don't know if this is normal or not. I do know that my last v8 pick up truck didn't sound anything like this.

Could it be an exhaust leak or issue?
 

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I have the leak too, on the passenger side. I once replaced this gasket on a 2000 F150 and it was time consuming. I looked yesterday at how big of a job this would be and I won't attempt it. I do most all my own work to my vehicles, but not this time! Luckily, we just bought the 06 4.7 a month ago and it has a 3 month/3000 mile warrenty that covers 100% of labor and parts. Guess who I'm calling monday morning? :icon_biggrin:
 

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How can you tell if you have a leak in the exhaust? Like I said in my post before, when I really give it some gas and put the peddle to the floor, it sounds like "chuga chuga chuga chuga" at a fast rate. Any insight would be great.

I just dont know if this is normal or not...
 

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Lifts sound pretty similar. Hard to explain the difference without actually hearing ya know? If you can verify which side it comes from then get out and have someone else start the car one day after it's set for a couple of days and then you listen with the hood up or down under the fender well may actually be the best place. If it's exhaust, it will be pretty loud on the inital start up. Mine is at least.
 

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exhaust leak

hi everyone i have a Commander 5.7L Hemi Overland and was wondering about a what sounds like an exhaust leak when i accelerate.I put the jeep in neutral and rev it up and cant hear the leak,can you help me please!!!
 

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You would not want to drive to long with an exhaust manifold leaking cause the heat leaking may warp the head, seen it on my friends 4.7 GC.. She drove with the gasket shot and messed the head up to the point of needing replacement, get it done sooner than later..
 

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You would not want to drive to long with an exhaust manifold leaking cause the heat leaking may warp the head, seen it on my friends 4.7 GC.. She drove with the gasket shot and messed the head up to the point of needing replacement, get it done sooner than later..
Yes, but how do I know if I have an exhaust leak? What are the symptoms?
 

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Luckily my HEMI has not done it but hers sounded like s**t, ran rough and was obvious.. The more subtle leaks may not have much symptoms at all other than a small noise when cold. Only way to be sure is inspect thoroughly while cold, you will hear it if you have a leak it sounds like a bad muffler. Also if the sound is temp sensitive you probably have an gasket leak as stated above it will expand when hot and "reseal" itself
 
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