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GM Top End Cleaner - Different Decarbon Technique.

This is a discussion on GM Top End Cleaner - Different Decarbon Technique. within the Technical / Maintenance forums, part of the General Discussion category; Given the issue my truck had with the plugged fixed orifice PCV siphoning oil into the intake (fixed now), I ...

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    Resident Dick Quyonmob's Avatar
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    GM Top End Cleaner - Different Decarbon Technique.


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    Given the issue my truck had with the plugged fixed orifice PCV siphoning oil into the intake (fixed now), I imagine I have some serious carbon build up in the combustion chambers.

    I'll likely used GM Top End Cleaner, and not through the PCV or Brake booster as it seems to only service the rear most cylinders.

    Was reading this on the LS1Tech boards;

    Quote Originally Posted by bparker on LS1Tech.com
    I felt it necessary to fill you all in on how to de-carbon your engines. Here is the reason. For most all situations, knock on a stock c5 will be due to carbon buildup, plain and simple. While there is a lot of speculation, fact is that out of 51 different c5 that I have performed this procedure, NONE have returned. There will always be the occasional one that this may NOT apply to, but for the most part, it should work. Also, just a side note, if your c5 is modified, even with just a MAF, this may not work, due to other issues, so do not ASSUME that this is a fix all.
    Okay, first thing, go down to your GM dealer and purchase 2 cans of liquid top engine cleaner #1050002. That’s the part number. And get oil and filter, as you will have to change the oil after this procedure.
    Second, let the car sit until it gets cold before you start this procedure.
    Now, are you ready???? First, remove all spark plugs.
    Next, evenly divide the 2 cans to feed 8 cylinders.
    Remember that this will get messy, so have plenty of rags around, and put something under your car, and not all the cylinders will take all the chemical.
    Next, add the cleaner to each cylinder, some may pour out, and some may take all of it. I leave rags under each plughole.
    Then, pop a cold one because the cleaner must sit at least 6 hours, I like to see 12, but at least 6 are the minimum.
    The next morning or whatever put a bunch of rags over all the plugholes, as you must crank over the engine to expel the entire cleaner. It’s going to leave a mess, so be warned. Crank over then engine for about 15 seconds, that’s all it takes. Clean up all the residual off the manifolds, with brake cleaner or something. Install the plugs.
    Roll the vehicle outside, cause MAN is this going to smoke, and stink. Start it up, it will run rough for a while, this is common, and it will smoke too. Allow to idle for 20 mins. Then shut the engine down, and change the oil and filter.
    The cleaner dilutes the oil so we don’t want to drive the car until after all has been consumed in the chamber, and the oil is warm.
    Ok, now for the test drive, go to a highway, and drive a highway speeds for about 20 mins, to expel the cleaner from the exhaust. The car WILL smoke for some of the test drive, this is NORMAL. But by the time that you get back, it should be pretty much gone.
    Ok, that’s it. Just remember, this is informational, nothing more. You may get some oxygen codes or some misfire until the cleaner is burned off, this is NORMAL. Just reset the codes, and you will be fine.
    I have had a lot of success with this, as have some of the members that I have emailed this process to, but you must follow it exactly, thanks.
    Best to all, and I remain, c4c5 specialist
    Sounds like a good procedure for cleaning the tops of the pistons, but I don't see how this will touch the valves/head, as the liquid will just be pooled on top of the piston (othen than it will be sprayed up there when cranked over to clear it).

    Or is it worth it to take it to the dealership;

    Quote Originally Posted by Pauly View Post
    Disable fuel pump,
    Pull fuel lines at teh intaek manifold
    Mix GM TEC with Gasoline in a container that can be pressurized.
    Attach container to shop air and regulate to 60 psi.
    Start truck and run teh engine off of teh gas/TEC mixture

    Sometimes they attach a nitrogen cylinder and blast the popets with 200 psi of nitrogen to loosen any deposits in the poppets.

    peace
    PAuly
    Can anyone confirm this is still the GM process for a 5.3L? Thjis process sounds agressive and efective.
    Last edited by Quyonmob; 02-04-2011 at 09:02 AM.

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    Registered User ToyHauler's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    that upper one doesnt sound right at all. he even said theres a few that wont take any. it might work on some dodge engines with the plugs that come out the top.
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    Resident Dick Quyonmob's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by ToyHauler View Post
    that upper one doesnt sound right at all. he even said theres a few that wont take any. it might work on some dodge engines with the plugs that come out the top.
    Well they cylinders that wouldn't take any just means they are at or near TDC.

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    Registered User BuckMaster9's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    The first procedure is the way all the sources I've seen say to do it. I'm interested in doing this to my 2002 5.3L. The only concern I have is the possibility of something clogging the catalytic converter on the way out the exhaust. I'm sorta on the fence...
    Last edited by BuckMaster9; 02-04-2011 at 10:51 AM.

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    Re: GM Top End Cleaner - Different Decarbon Technique.

    pauly's method is the easiest and best if you have the fuel injector kit.
    anybody try the 3m kit:

    http://www.youtube.com/watch?v=RX5J5kZLTw4
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    I used the spark plug method above. A turkey baster, filled with SeaFoam, was injected into each cylinder after the spark plug was removed. I used the baster to "shoot" the SeaForm into the cylinder with the hope of getting the valves and top chamber wet too. The truck sat overnight, and the next day I cranked with a paper towel under each plug hole. After putting back in the plugs, the engine smoked like crazy but has never pinged since and runs stronger.
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    Resident Dick Quyonmob's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by NEUMANNZZ View Post
    pauly's method is the easiest and best if you have the fuel injector kit.
    anybody try the 3m kit:

    http://www.youtube.com/watch?v=RX5J5kZLTw4
    Seems ok. I'm be tempted to use that in conjunction with pulling the plugs and feeding something directly to the cylinders.

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    Re: GM Top End Cleaner - Different Decarbon Technique.

    the first method is what the head of the auto department at school is teaching us to do....works very well for cleaning tops of pistons and such as previously stated, and that GM decarbonizer from my teachers experience is much stronger than seafoam thats why you dont want to do it through the brake booster. when i used his method it was on an old ford tractor (yes completely different i know, but stay with me here) that had low compression and the dean was working on just for his personal use to putt around in his yard. when compression testing, reading were very low, squirted some oil in cylinder and got a little better, then did the method above and doubled and some even tripled the compression reading. just follow everything in that procedure and im sure it wont upset.
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    I like the 2nd method. The little machine that GM uses kicks butt. You unhook your fuel lines and it plugs in to the fuel rails. It helps that a good buddy of mine is the service manager at a GM dealership and can bring it home. I think it may be a good idea to add the first option and do it both ways.
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    Resident Dick Quyonmob's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by e.mcconkey View Post
    the first method is what the head of the auto department at school is teaching us to do....works very well for cleaning tops of pistons and such as previously stated, and that GM decarbonizer from my teachers experience is much stronger than seafoam thats why you dont want to do it through the brake booster. when i used his method it was on an old ford tractor (yes completely different i know, but stay with me here) that had low compression and the dean was working on just for his personal use to putt around in his yard. when compression testing, reading were very low, squirted some oil in cylinder and got a little better, then did the method above and doubled and some even tripled the compression reading. just follow everything in that procedure and im sure it wont upset.
    So it freed stuck compression rings on the tractor.

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    Re: GM Top End Cleaner - Different Decarbon Technique.

    GM has reformulated the TEC and it is only now to be administed with gasoline through a pressurized tank via the fuel rail....

    I can't get the original stuff anymore.

    Looks like I'll use the Mopar combustion chamber cleaner. MCCC has pretty damn good reviews on LS1tech. It foams, so it may even do a better job when admisitered directly to through the spark plug hole, as it will fill the void and touch the top of the combustion chamber.

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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Could'nt you just pour it down into the TBI (on tbi engines at least) until the engine stalls and let it set for a while then start her up and blow all the crap out? That way you'd get some cleaner on the valves and top of the combustion chamber also? Similar to the seafoam method but not using the brake booster hose.
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    i did it to a mpfi and pulled the fuel rail and injectors out and put some in the there to get the top of the valves turned the engine over and did the other valves i did it over 2 days worked great i used the stuff from MOPAR cause i work for a dodge dealer. BG makes some good stuff also.
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    Resident Dick Quyonmob's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by doubletrouble View Post
    Could'nt you just pour it down into the TBI (on tbi engines at least) until the engine stalls and let it set for a while then start her up and blow all the crap out? That way you'd get some cleaner on the valves and top of the combustion chamber also? Similar to the seafoam method but not using the brake booster hose.
    Pouring down the TBI? You like big puddles in your intake manifold?

    Off topic anyhow.

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    Registered User Ironskull's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by Quyonmob View Post
    Given the issue my truck had with the plugged fixed orifice PCV siphoning oil into the intake (fixed now)
    Not to hijack your thread and not to sound dumb but what exactly is a plugged fixed orifice PCV?

    Jack in Michigan

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    Resident Dick Quyonmob's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by Ironskull View Post
    Not to hijack your thread and not to sound dumb but what exactly is a plugged fixed orifice PCV?

    Jack in Michigan
    GM stopped using PCV valves and switched to a fixed orifice positive crankcase ventilation system. Essentially they eliminated the valve part by making the hole (fixed orifice) the "perfect" diameter.

    Mine plugged enough to not allow oil to drain off the baffles, so it sucked oil into the intake manifold.
    Last edited by Quyonmob; 03-31-2011 at 01:12 PM.

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    Registered User Ironskull's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    AHH, OK. Thanks.

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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Quote Originally Posted by doubletrouble View Post
    Could'nt you just pour it down into the TBI (on tbi engines at least) until the engine stalls and let it set for a while then start her up and blow all the crap out? That way you'd get some cleaner on the valves and top of the combustion chamber also? Similar to the seafoam method but not using the brake booster hose.
    This works for both TBI and carbed trucks, also works for L31 Vortec 305/350/4.3.

    peace
    PAuly
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    Did anyone end up trying the mccc? I was going to do a full seafoam treatment soon (two cans, including pouring it into the oil), but now this has sparked my interest.

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    Resident Dick Quyonmob's Avatar
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    Re: GM Top End Cleaner - Different Decarbon Technique.

    bought 1 can MCCC today. $8.

 

 
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