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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Exhaust Mods

Exhaust Mods Performance Exhaust Modifications

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  #41  
Old 06-06-2009, 10:39 PM
themully themully is offline
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2004 Chevy TrailBlazer LS EXT
Summit White 4.2L I6 4X4
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Replaced the mainifold

Well the manifold has been replaced. The back bolt broke (of course). I was not able to drill it out so I am rolling with out it. Anyone else do this? What was your experience. Right now life is good no leak and quite again. Also how can I know for sure the CAT is not plugged up causing this to crack in the first place. Thanks for any input
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  #42  
Old 06-07-2009, 12:53 AM
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Robert1101 Robert1101 is offline
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Quote:
Originally Posted by drhinckley View Post
Being in Kuwait I have not place to do my own work so rather than try to save a buck going to some Haji garage where the mechanic does not speak very much English I go to a local GM dealer. To replace the cracked manifold and of course they broke bolts in removing the old one, cost me around 700 dollars to replace. Then it started throwing DTC's P0171 and P0172 and of course the vehicle ran with greatly reduced power. I took it back to the dealer and they diagnosed it to the Cat. Rather than spending big bucks to replace it, I agreed to have them send it out and have it cleaned or whatever they did. Anyway, it runs great now so if I could only get it to run cooler I would be happy. With the mods I have done and the tune, it will get up to 140 MPH fairly easy but the temp goes way up when I do. I'm running E-fans so that really helps. The afternoon temps here are around 115 F on the drive back home.
If you want it to run cooler you might want to look into a tranny cooler (LARGE) and a engine oil cooler(ALSO LARGE) as well. Get the heat out before the coolant trys to get rid of it through the radiator.
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Earth first, we will strip mine the other planets later 3.73's, G80, 4X4, PCMforLess, Flowmaster 70, K&N 57
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  #43  
Old 06-07-2009, 02:48 AM
drhinckley drhinckley is offline
 
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Tranny Oil Cooler

Thanks, I installed the HP Tuners plug and play aux tranny cooler and that helped keep the trans oil temps way down. I use an Aeroforce Scangauge so am able to monitor the temps among other things. Using the Aux cooler, it dropped my oil temps down by an average of 25 degrees. I also run a TCI deep pan but did not notice any difference there but I'm sure it helps with the cooling fins on the pan and it's lower into the air stream. It still gets damned hot around here. If I could fit a larger radiator I know that would help. With the A/C on a lot of super hot air flows from the condenser through the radiator. I open for suggestions that may help.
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  #44  
Old 06-07-2009, 11:44 AM
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Robert1101 Robert1101 is offline
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You might be in the wrong part of the world, but can you find anybody that can build a copper 3 channel radiator? I did that in Las Vegas and really cooled down my Ranger.
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Earth first, we will strip mine the other planets later 3.73's, G80, 4X4, PCMforLess, Flowmaster 70, K&N 57
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  #45  
Old 06-08-2009, 10:24 AM
drhinckley drhinckley is offline
 
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Good Idea

Dang, these Hajis over here can build anything so that's the next step I'll take. Thanks for the idea.
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  #46  
Old 06-09-2009, 01:50 AM
jayrod jayrod is offline
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Man whats causing all these manifolds to crack?
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  #47  
Old 06-09-2009, 02:59 AM
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ViperVenom86 ViperVenom86 is offline
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Curious

By any chance did u do it while the engine was hot? Because i can almost certainly say you may not have had that problem if the engine was at operating temp due to the heat it helps the bolts come out just a little bit easier.. Anyway sorry for your luck hope it turns out for the better..
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  #48  
Old 06-10-2009, 08:36 PM
themully themully is offline
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2004 Chevy TrailBlazer LS EXT
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Quote:
Originally Posted by themully View Post
Well the manifold has been replaced. The back bolt broke (of course). I was not able to drill it out so I am rolling with out it. Anyone else do this? What was your experience. Right now life is good no leak and quite again. Also how can I know for sure the CAT is not plugged up causing this to crack in the first place. Thanks for any input
Ya I had it warm not hot, I cracked them loose Friday night. Then Saturday I went to work on em. The back one my have been broken before I wrenched it. It was surprisingly easy to loose.
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  #49  
Old 06-15-2009, 09:40 PM
exttb exttb is offline
 
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mine cracked I beleive form a plugged cat or the ac dripping down onto it
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  #50  
Old 06-16-2009, 02:48 AM
RagMaN RagMaN is offline
 
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Quote:
Originally Posted by exttb View Post
mine cracked I beleive form a plugged cat or the ac dripping down onto it
I will sell you a manifold from GMPArts direct, with gasket and exhaust dount for $150 shipped....as gmparts direct sent me two. Can put on Ebay if you want.

Also, AC dripping on it will not crack it, it is more than likely a plugged CAT. I got a direct WALKER bolt in replacement CAT for <300 at Oriley Auto Parts. You do have to remove the exhaust hanger that is secured under the TRANNY Bracket...once you do that, it is easy to get out from the bottom.
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