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Chevy Silverado and GMC Sierra Exhaust System Questions

I own a 2000 chev silverado 2500 with a 6.0 litre. I recently had dual exhaust installed on it (they sound sweet by the way). Before it was installed, i wanted them look at an exhaust leak i could hear near the engine compartment. Which i thought was the collector gasket. With out even looking the guy said "its probably the exhaust manifold bolts." Sure enough, looked under the hood and the front and the rear bolts were broke off on the drivers side. He said he's ran into that alot and that they break flush with the head so you have to remove the head because there's not enough clearance between the head and the firewall.
Has anyone else had this problem?
I've heard it happens on the 5.3 liters too.
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Comments

  • pbug777 I have the same problem. I also own a 2000 Chevy Silverado 2500 with the 6.0L and I had an exhaust leak that I could only pin to the drivers side manifold but I didn't know where. After reading your post I went and looked and sure enough I am missing the front two exhaust manifold bolts on the drivers side. Out of curiosity, did you get it fixed and how much did it cost?
  • No, i haven't had it repaired yet. I've been quoted a minimum of $400 dollars by a chevy dealer because they want to take the heads off to take the bolts out and can't guarantee the removal of them. I have bolts broke on cylinder #1,2, and 7. Number 1 and 2 i was thinking of just using an easy out because you can get to them easily. Number 7 is the problem, there's not enough clearance to get anything in there because of the firewall. I'm waiting till it gets warmer out, live in minnesota. Call GM head quarters and make a complaint about it. If there's enough complaints they will make it a recall. I've heard in some states it's already a recall, not sure which ones or if its true. If you find out more info please keep me informed and I'll do the same.
  • Now that the weather has warmed up I finally tackled the broken bolts. I got lucky when I removed the remaining 4 bolts as none of the heads broke off. Took awhile to get the bolts loose where the manifold connects to the head pipe but I finally muscled them off and got the manifold out. After removing the plug wires and some other things I could finally get at the bolts. Fortunately there was a 1/4 inch of the bolt sticking out of the block on both bolts. I got some vise grips on them and once I got them turning they came out without too much trouble. Took forever as I could only get about a 1/4 turn before I had to release the vice grips and reset them. I replaced all 6 bolts on the drivers side as I already had them out. Total cost: $15.50 for the bolts. (Gasket was still good) Total Time: 3 hours
  • klobearklobear Posts: 1
    I just had my drivers side replaced($1600.) This is the 2nd time. Dealer said other than a small cut in parts cost there was no recourse. The sad part is, the 1st time(3 yrs. ago) warranty covered the cost, and they replaced both manifolds, but put in the same type of bolts. Now the techs tell me the fix is a bolt with a larger head. I live in Canada and would like to hear from any one that has the same problem.
  • stacks125stacks125 Posts: 6
    I have a 1995 GMC Sierra 4x4 350 extended cab shortbed and I am putting it in my buddies barn to do a lot of work on it. One of the things is new exhaust. I don't really need to replace everything but I thought I just should since I'm putting on headers, one more cat for true duals and two new flowmaster mufflers and tips.(allready halfway there) I am pretty good at welding so I can do it all myself for it will be a lot cheaper. I bought flowtech headers(long) about a year ago and still have not put them on, so now would be a good time. I did not purchase a y-pipe to connect them so I thought I would just make it true dual exhaust.(kinda a all around handyman) Right now the exhaust goes from my two manifols into on catalitic converter and then back into duals with two mufflers(owner before me did that whole setup). The oxygen sensor is right in front of the catalitic converter. MY PROBLEM is that when i make it true duals there is only one oxygen sensor, so would anyone know how to hook up a second one, and where to hook it into, so the computer still reads both banks and doesn't make the truck run bad because it can't read one bank. Maybe all I have to do is splice it into the other one? don't know. thanks a lot for your help Derek
  • pawngodpawngod Posts: 4
    well i got my 08 denali sierra awd....curious what that muffler looking thing is at the passenger rear tire....has anyone removed it as a mod over replacing w/after market cat back? i also want to remove the front bumper license plate holder as i dont need it in okla. i cant see any bolts on it...anyone know how to remove it??
    would adding a volant cai void the warranty? not impress w/the 14,4 gal i been averaging...w/only 3 tanks of gas and around 1000 miles on it sofar....tranny seems funky..but hoping its still breakin in...thanks in advance
  • tigerpwrtigerpwr Posts: 1
    I have the same question as stacks about the O2 sensors. Any help on this would be great.
  • obyoneobyone Posts: 8,065
    would adding a volant cai void the warranty? No, but it would add to the noise in the cab while not improving much on anything.

    i also want to remove the front bumper license plate holder as i dont need it in okla. Isn't the plate holder molded as part of the bumper?

    tranny seems funky

    Yeah GM hasn't gotten the programming right on the 6 sp auto.

    curious what that muffler looking thing is at the passenger rear tire

    If it's smaller than the muffler it's probably a resonator and will be removed if installing a catback which again doesn't do much except increase incab noise.
  • obyoneobyone Posts: 8,065
    You can buy a fake O2 sensor online which will give a false reading to the computer at all times without affecting performance. This one fake O2 sensor should be enough so as not to be concerned with the other exhaust manifold.

    Course if you're concerned about passing emission testing well you can forget that.
  • I'm kinda curious as to how involved troubleshooting an "egr system failure" code on my truckis. As the truck is pushing 14 years old i figure this kinda stuff happens but i dont wanna tear into it completely blind. If anyone has any tips or ideas as to what the most common causes are, Lemme Know! i just put a new O2 sensor in a month ago so thats not it. The damn check engine light comes on and goes off sporadically so i figured it was just the gas cap leaking but the clown at O'reilly's says this is the problem, whatever. Any Help would be appreciated.
  • stacks125stacks125 Posts: 6
    thanks for the tip, I'll have to look into that, Stacks
  • pbug777pbug777 Posts: 4
    check for leaks aroung your intake manifold, i have the same problem with the check engine light going on and off and a mechanic told me to check for that. I haven't had time to check yet. He said just spray water with a little bit of soap aroung the intake while its running.
  • i have a 2003 sierra 1500 and i was wanting to do something with my exhaust, possibly 3 inch straight pipes. I live in saskatoon, and i was wondering where the best place would be to go to do something like that! I just cant stand not being able to hear my truck roar when i drive, its just too quiet.
  • obyoneobyone Posts: 8,065
    3" straight pipes will get you a lot of sound but a loss in performance also due to lack of restriction. Any muffler shop should be able to do this for you and throw on a couple of glass packs. There are other alternatives but they are expensive.
  • I HAVE A 07 CHEV 2500 DURAMAX. 25K MILES. WHEN TOWING MY 5TH WHEEL UP HILL THE SKILL SAE SOUND STARTS. IVE HAD IT IN 3 TIMES TRYING TO FIND PROBLEM (NO LUCK). THIS TIME I TOOK THE TECH WITH ME WITH COMPUTOR. SAME SOUND BUT NO READINGS. NOW THEY WANT TO TAKE MANIFLOD APATR AND REPLACE GASKETS. SOMETHING ABOUT NO ENOUGH PRESURE SO THE TURBO WILL WORK. I FEEL IAM GETTING THE OLD R&R ROUTINE.
    ANYONE ELSE HAVING THIS NOISE PROBLEM? ITS SO LOUD WHEN I GO BY SOMEONE THEY LOOK AT ME AND GO????????
  • balichbalich Posts: 62
    This is a weird one .. hopefully someone can give me suggestions:

    Just recently (starting last month) .. when I park truck in garage (its shut off) ... after 10 minutes... I would hear a BANG noise - consistantly each evening .. I was not sure what it was .. so I stayed under truck each night .. and sure enough - after approx 10 minutes .. I would hear a single BANG - pretty loud.

    After monitoring this .. I notice the bang is coming from muffler.

    So I hear a single loud BANG after my truck(turned off) sits for 10 minutes.

    Any ideas ? The truck runs and sounds fine .. just a BANG after truck sits for 10 minutes .. this is consistant behavior.

    I am hoping someone has seen this before ?

    Truck is almost 6 years old - 25K miles - original exhaust.

    Thanks!
  • obyoneobyone Posts: 8,065
    Following what you stated that the sound is coming from the muffler, the only thing that's in the muffler is metal and fiberglass. So assuming that the metal is cooling the sound is from the metal contracting while cooling. It could be that one of the baffles is cracked causing more noise than normal or making it more noticeable.
  • Hey I'm new to this. I've got a 2007 Chevrolet Silverado with the aluminum block 5.3 litre engine.
    I bought it new and had a flowmaster dual exhaust system installed on it when i first got it. Every since I had it installed, the engine kinda stutters, i guess you could say, but it is more noticeable when you around 50 mph or so, and when you get over 60 mph the engine will clear up and run smooth.
    Has anyone else had this problem? I would appreciate some help. Thanks!
  • obyoneobyone Posts: 8,065
    Not to dump on your choice of exhaust systems but Flowmasters has to be one of the worst systems perhaps next to Gibson. They will break down in 4-5 years, cause in cab resonance, loss of lowend torque and rattle. The engine stuttering might be caused by an exhaust leak from a bad install. Then again, was this particular flowmaster system designed specifically for the Silverado or was it installed by a local muffler shop using flowmaster mufflers and homemade pipes?

    A Borla or Corsa system designed for the Silverado would deliver a little better performance.
  • I forgot to mention that it is a silverado classic, but anyways, I think that flowmaster has the best sounding muffler tone of any exhaust system, and also yes it was installed by a local muffler shop and I'm not sure if it was specifically for my truck or not. It's almost like you're just feathering the throttle untill you get to about 60 mph. You can only tell it when it is in overdrive and the transmission sometimes shifts from 3rd gear straight to overdrive and skips 4th gear. I will check underneath to see if I can find an exhaust leak but I cant hear it from outside the vehicle. Thanks for your input
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