98LTZ Posted February 17, 2010 Report Share Posted February 17, 2010 I see a small pool(nothing major)of oil near the #1 injector the 1st one closest to the firewall. Also I see some oil running down the drivers side of the block running from the lower intake. The af level is a-ok. I know I'll probably need some front valve cover gaskets and the rear seems ok. Could those above described leaks is a sign of the intake gaskets getting ready to fail?? I plan on keeping the car for a while and I know at some point i'll have to replace them. The car has a 178K on it and I switched to the any color green antifreeze which I know its not gonna do any good because the damage is already done. The car runs like a top. I know I have to do a lot of degreasing around the injectors before I do the job. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted February 17, 2010 Report Share Posted February 17, 2010 A)FailING, and B)Dexcool isn't the cause! Quote Link to comment Share on other sites More sharing options...
Night Fury Posted February 17, 2010 Report Share Posted February 17, 2010 The LIMGs failed on my 05, but they were failing internally(oil into the coolant), not externally. Quote Link to comment Share on other sites More sharing options...
98LTZ Posted February 17, 2010 Author Report Share Posted February 17, 2010 Yea I know the dex-cool has nothing to do with it but i'm more concerned about the oil leaks around it. I wonder has anybody had that problem before replacing them?? Did the oil leaks stop after replacing them?? Like I said the car is acting normally and no coolant loss. Should I replace the upper plenum also?? Quote Link to comment Share on other sites More sharing options...
Night Fury Posted February 17, 2010 Report Share Posted February 17, 2010 Yes, they are prone to cracking around the EGR stovepipe. Which introduces coolant into the cylinders. Which kills your engine. Anyhoo, they revised the upper plenum, different stovepipe. Quote Link to comment Share on other sites More sharing options...
BXX Posted February 17, 2010 Report Share Posted February 17, 2010 Yes, do the LIM and upper plenum. Get a Dorman plenum (any parts store will stock them) Go Felpro for the lim gaskets. Yes, once replaced with quality parts and not screwing up the install (USE A GOOD TORQUE WRENCH) and the oil leaks and other fun crap will be a thing of the past! Quote Link to comment Share on other sites More sharing options...
98LTZ Posted February 17, 2010 Author Report Share Posted February 17, 2010 Oh ok. I'll replace the plenum also. So the oil leaks do show they're getting ready to fail huh?? While I have it all apart, I might as well replace the valve cover gaskets also. Quote Link to comment Share on other sites More sharing options...
zipper Posted February 17, 2010 Report Share Posted February 17, 2010 The LIM gasket probably already failed. Make sure you replace it with an aluminum gasket and like Bob's Yer Uncle said get the Dorman plenum. You might not need to do the valve cover gaskets but they're really cheap anyways (like $12-15) so you might as well do it anyways. It's not too bad of a job to do but you will break the LIM plenum to get the LIM off so that's why you need the Dorman plenum. Quote Link to comment Share on other sites More sharing options...
KingVee Posted February 17, 2010 Report Share Posted February 17, 2010 The LIM gasket probably already failed. Make sure you replace it with an aluminum gasket and like Bob's Yer Uncle said get the Dorman plenum. You might not need to do the valve cover gaskets but they're really cheap anyways (like $12-15) so you might as well do it anyways. It's not too bad of a job to do but you will break the LIM plenum to get the LIM off so that's why you need the Dorman plenum. Not that he will break it, but because it's so cheapily made, it warps under the warm temperatures of the engine over time. Who the fuck though making plastic intake manifolds was a good idea? Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted February 17, 2010 Report Share Posted February 17, 2010 Amazon.com probably has the Dorman intake cheaper than anyone else. http://www.amazon.com/Dorman-Solutions-Intake-Manifold-615-180/dp/B000C17G5E Part stores are probably $40-50 more expensive for the same part... Quote Link to comment Share on other sites More sharing options...
cubsfan24 Posted February 18, 2010 Report Share Posted February 18, 2010 Amazon.com probably has the Dorman intake cheaper than anyone else. http://www.amazon.com/Dorman-Solutions-Intake-Manifold-615-180/dp/B000C17G5E Part stores are probably $40-50 more expensive for the same part... Ya I love amazon. Looks to be a great deal too. Amazon also has a open box one for $50.99. Probably just a return from someone that bought the wrong thing. I would take the chance cause amazon has a great return policy if for some reason it was damaged. Quote Link to comment Share on other sites More sharing options...
98LTZ Posted February 18, 2010 Author Report Share Posted February 18, 2010 Damn a lot of replies lol. Thanks guys. I have another question, how long does it take on average to do the job start to finish?? Quote Link to comment Share on other sites More sharing options...
KingVee Posted February 18, 2010 Report Share Posted February 18, 2010 I will do this job on my GP too, when warm weather comes. I don't have any knowledge of how to do it but most people on here tell me it's kinda easy. My mechanic told me I shouldn't since I don't know how, but fuck most people on here didn't even know how when they done it - what could I possibly fuck up? I'll give you a guess that the experimented guy can do it under 24 hours. Maybe a week-end for a guy who's not used to doing it? Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted February 18, 2010 Report Share Posted February 18, 2010 The first time I did it on an L36 it took me 4 hours from start to finish. Now I can do it in under an hour. Its really quite a simple job, especially if you aren't doing LIM Gaskets, which I would recommend you do while you're that far into the top end. Quote Link to comment Share on other sites More sharing options...
KingVee Posted February 18, 2010 Report Share Posted February 18, 2010 The first time I did it on an L36 it took me 4 hours from start to finish. Now I can do it in under an hour. Its really quite a simple job, especially if you aren't doing LIM Gaskets, which I would recommend you do while you're that far into the top end. I would be fuckin' pleased to do LIMG + UIM replacement in 4 hours. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted February 18, 2010 Report Share Posted February 18, 2010 The first time I did it on an L36 it took me 4 hours from start to finish. Now I can do it in under an hour. Its really quite a simple job, especially if you aren't doing LIM Gaskets, which I would recommend you do while you're that far into the top end. I would be fuckin' pleased to do LIMG + UIM replacement in 4 hours. If you were closer, I'd help you. Quote Link to comment Share on other sites More sharing options...
KingVee Posted February 18, 2010 Report Share Posted February 18, 2010 The first time I did it on an L36 it took me 4 hours from start to finish. Now I can do it in under an hour. Its really quite a simple job, especially if you aren't doing LIM Gaskets, which I would recommend you do while you're that far into the top end. I would be fuckin' pleased to do LIMG + UIM replacement in 4 hours. If you were closer, I'd help you. I'd pay you to... Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted February 18, 2010 Report Share Posted February 18, 2010 I can give you my phone number so I can walk you through any point you get stuck in if you want. If you've worked on your car before, this shouldn't be very difficult at all. Its one of those things that you really don't need to worry about. Just take it one step at a time and if you take you're time and have a 6-8 beers, you'll be done in 6 hours. Buck isn't a mechanic by any means, and to his credit, he was able to do this job on an L36. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted February 18, 2010 Report Share Posted February 18, 2010 Buck isn't a mechanic by any means, and to his credit, he was able to do this job on an L36. I've done LIMGs on a L32, LIMGs on a L36, AND head gaskets on a 3500, TYVM!!!!! <3 <3 But yeah,,, there are numerous people on here that have done it more than once to help you out. Quote Link to comment Share on other sites More sharing options...
KingVee Posted February 18, 2010 Report Share Posted February 18, 2010 Well, I've said it before and I'll say it again, what would be of tremendous help for me is some kind of write up of what to do... In all honesty, I didn't even know how to take the 3800 cover off until a week or two later after I had my GP... I know a bit of theory, but the practicality is non-existent. What happens is, I get in front of the engine and go, what the fuck will I have to take off first? Clueless mechanical work is FTW! :lol: Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted February 18, 2010 Report Share Posted February 18, 2010 This is precisely why you need a haynes manual. I'd copy the steps out of mine for you, but I seem to have misplaced mine. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted February 18, 2010 Report Share Posted February 18, 2010 Well, I've said it before and I'll say it again, what would be of tremendous help for me is some kind of write up of what to do... In all honesty, I didn't even know how to take the 3800 cover off until a week or two later after I had my GP... I know a bit of theory, but the practicality is non-existent. What happens is, I get in front of the engine and go, what the fuck will I have to take off first? Clueless mechanical work is FTW! :lol: I'll create a write-up today, from my GM service manual Quote Link to comment Share on other sites More sharing options...
KingVee Posted February 18, 2010 Report Share Posted February 18, 2010 Well, I've said it before and I'll say it again, what would be of tremendous help for me is some kind of write up of what to do... In all honesty, I didn't even know how to take the 3800 cover off until a week or two later after I had my GP... I know a bit of theory, but the practicality is non-existent. What happens is, I get in front of the engine and go, what the fuck will I have to take off first? Clueless mechanical work is FTW! :lol: I'll create a write-up today, from my GM service manual PLEASE DO! I'll give you some love for that... Well, not exactly... Quote Link to comment Share on other sites More sharing options...
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