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Chevy Silverado and GMC Sierra Exhaust System Questions

37 messages,  Last post on Oct 13, 2009 at 11:32 AM

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What is this discussion about? Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, GMC Sierra 2500, Chevrolet Silverado 3500, GMC Sierra 3500, Exhaust, Truck


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#3 of 37
RE: Exhaust manifold bolts [marky3130] by pbug777
Feb 27, 2008 (2:47 pm)
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Replying to: marky3130 (Feb 25, 2008 3:14 pm)

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.
#4 of 37
RE: Exhaust manifold bolts [pbug777] by marky3130
Apr 09, 2008 (8:24 pm)
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Replying to: pbug777 (Feb 27, 2008 2:47 pm)

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
#5 of 37
RE: Exhaust manifold bolts [marky3130] by klobear
Jun 01, 2008 (3:42 pm)
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Replying to: marky3130 (Apr 09, 2008 8:24 pm)

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.
#6 of 37
adding Oxygen Sensor by stacks125
Jun 12, 2008 (5:45 pm)
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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
#7 of 37
08 denali exhaust syste by pawngod
Jun 28, 2008 (7:39 pm)
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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
#8 of 37
re: adding oxygen sensor by tigerpwr
Jun 30, 2008 (11:11 am)
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I have the same question as stacks about the O2 sensors. Any help on this would be great.
#9 of 37
Re: 08 denali exhaust syste [pawngod] by obyone
Jun 30, 2008 (12:14 pm)
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Replying to: pawngod (Jun 28, 2008 7:39 pm)

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.
#10 of 37
re: adding oxygen sensor [tigerpwr] by obyone
Jun 30, 2008 (12:18 pm)
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Replying to: tigerpwr (Jun 30, 2008 11:11 am)

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.
#11 of 37
EGR System Failure, '95 silverado 5.7l by cowboycadillac
Jul 08, 2008 (2:19 pm)
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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.
#12 of 37
re: adding oxygen sensor [obyone] by stacks125
Jul 13, 2008 (7:50 pm)
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Replying to: obyone (Jun 30, 2008 12:18 pm)

thanks for the tip, I'll have to look into that, Stacks

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