Exhaust leak

[clm7214]

Ive got an exhaust leak but cant find it. Are there gaskets on the collectors? I cant find it and really dont wanna take off the headers. It goes away when it warms up, but just knowing its leaking drives me nuts. Thanks

[KICK]

better reason for fixin it might be that you ould be poisoning yourself.

[95Sierra2500]

If it goes away when it warms up, that sounds like one of your donut gaskets, or a gasket between the cat and one of the pipes is shot. Get up under there and find it and your truck will sound 100% better.

[Jimmy J]

I'd be looking for a faulty gasket. I'd replace any that may be leaking. And here's a great tip courtesy of my local mechanic, (not a STEALER)...a guy I'd trust with my life.

 

When tightening your bolts whether it be to a specific torque spec or not, once you've reched the desired tightness, back it just a hair, then retighten it again. This helps to better seat the nuts & bolts due to variations in their manufacturing i.e., burrs and such. This will help prevent loosening over time. A great tip for any exhaust related issues and the tightening of nuts & bolts in general!

[slowpokebanshee]

check the driver side exhaust manifold for the furthest bolt back, maybe broke the head off the bolt and leaking there.....seen a hundred of them on 6.0 litres

[ZZ327]

does it kind of sound like a rattling sometimes when you first start it especially when you back up?

 

then in driving you get a Tingting ting ting ping ping. ??? Ive got the same prob, I think. What the hell is that? Ive only got 13000 miles on my 05!!

 

ive only noticed it when cold, and since it came back from the dealer for warranty work and alignment

[whmayhew]

check the driver side exhaust manifold for the furthest bolt back, maybe broke the head off the bolt and leaking there.....seen a hundred of them on 6.0 litres

 

<{POST_SNAPBACK}>

 

 

I bought a 99 GMC 2500 recently off a wholesale lot and I have that ticking also. Replaced the round steel gasket but still made that ticking. I got to checking the exhaust manifold and there were only 3 bolts there. Took the exhaust manifold off and 2 of the bolts were broke off even with the head. The other one was sticking out enough to get it with vice grips. Both of the end ones are the ones that are broke off even with the head. I will put it back together this morning with 4 new updated bolts and a new gasket. Hoping this works. Does anyone have any ideas (easy) to get the other bolts out?

[clm7214]

I checked the exhaust manifolds this weekend and a bunch of the bolts were loose. I hate exhaust gaskets!!! Those of you who put new exhaust manifold gaskets on the 6.0L, which brand did you use? And does ARP make exhaust manifold bolts for the 6.0L?

[Mattt]

does it kind of sound like a rattling  sometimes when you first start it  especially when you back up?

 

then in driving you get a Tingting  ting ting  ping ping.    ???      Ive got the same prob, I think.  What the hell is that?  Ive only got 13000 miles on my 05!!

 

ive only noticed it when cold, and since it came back from the dealer for warranty work  and alignment

 

<{POST_SNAPBACK}>

 

 

 

 

My '01 makes a rattling noise like this. On mine, there are two pipes before the muffler. One has a flange connection, the other is a slip fit connection with a clamp. The slip fit is where mine rattles. Doesnt matter how much you tighten the clamp, it still rattles. With only 13k, take it to the dealer and have them fix it under warranty. Mine was "fixed" a few times under warranty, but it always comes back.

[whmayhew]

I checked the exhaust manifolds this weekend and a bunch of the bolts were loose.  I hate exhaust gaskets!!!  Those of you who put new exhaust manifold gaskets on the 6.0L, which brand did you use?  And does ARP make exhaust manifold bolts for the 6.0L?

 

<{POST_SNAPBACK}>

 

 

 

 

I used a gasket from the dealer, about $13 and 4 new bolts which were $3.65 each. They have a bigger head on them. With the new gasket, which is two layer of metal, and 4 new bolts the tick is gone.

[clm7214]

I changed my exhaust manifold gaskets this weekend. FelPro from checker. When i got the old ones off they had been leaking at 5 different points. Changing them was very easy also, just make sure you clean the threads and bolts. She purrs like a kitten now instead of sounding like a bomb waiting to go off.

[Mattt]

As long as you are still within the emissions warranty, which I think is 70k miles, the dealer will usually take care of these problems. They did on my 01 with broken bolts, and a warped exhaust manifold.

[MDenny]

Well, I have the dreaded tick tick tick and ended up being a broken bolt on the passenger side exhaust manifold. Only ticks for a minute or so then goes away when it warms up. I called the dealership today and asked about possible warranty work. They replied only the computer and cat converter were covered. I asked about the part in the warranty book that states exhaust manifolds were covered 7 years 70,000 miles and he said that there was no such coverage. I guess I need glasses since I can't read the brochure they put out. I will be trying to call a couple of other local dealerships and see if they will bite the bullet and help me out. I guess I shouldn't hold my breath. Any tsb or other info that would help me out? Sounds like this is a common problem.

Thanks,

Michael

[Mattt]

The guy you spoke with at the dealership is an uninformed idiot. Was it a service writer? If so, he is either ignorant of warranty info or was trying to upsell the job. Seems like that is all any service writer wants to do, sell a job.

 

I would call the same dealership back and ask to speak with the service manager. If the mgr. tells you the same ask for your local GM rep's phone #, or the # to corporate GM. Work it from the top down if you get nowhere with the dealership. Im sure GM would not like to hear about a dealership not honoring a factory warranty. Its in the warranty book, it is covered, period.