GM top end cleaner?
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TECH Enthusiast
Joined: Oct 2002
Posts: 739
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From: houston,texas
GM top end cleaner? Who sells it and how much does it cost?..also could someone who has used it...pretty much describe how to?...thanx! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Was it the spray or foam kind?...I don't know...I would really appreciate it!!!
Was it the spray or foam kind?...I don't know...I would really appreciate it!!!
TECH Apprentice
Joined: Aug 2002
Posts: 331
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From: Gambrills, MD
Re: GM top end cleaner? GM makes it, in liquid or aerosol form.
If you use the aerosol, you can spray it into the spark plug holes, let it sit overnight then replace the plugs, fire it up, & hold yur nose. The aerosol version is also good for cleaning heads that are off the block, and the tops of the pistons.
The liquid version is easier to use. You can suck it into the intake through the PCV nipple on the throttle body, or the brake booster line. As long as the vacuum sucks in some air along w/ the liquid, the engine won't die. As soon as it's all in, turn off the engine immediately, wait 30 minutes or so, then start it up & hold your nose.
You may need several applications.
Be sure to change your oil & filter afterwards.
If you use the aerosol, you can spray it into the spark plug holes, let it sit overnight then replace the plugs, fire it up, & hold yur nose. The aerosol version is also good for cleaning heads that are off the block, and the tops of the pistons.
The liquid version is easier to use. You can suck it into the intake through the PCV nipple on the throttle body, or the brake booster line. As long as the vacuum sucks in some air along w/ the liquid, the engine won't die. As soon as it's all in, turn off the engine immediately, wait 30 minutes or so, then start it up & hold your nose.
You may need several applications.
Be sure to change your oil & filter afterwards.
Teching In
Joined: Oct 2002
Posts: 47
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From: New Orleans, Louisiana
Re: GM top end cleaner? It depends on what your trying to do with it. If your trying to clean your valves as well as clear carbon from the top of the pistons and rings, use the proceedure HITMANSS describes.
As a current fix for common "piston slap" noises, GM is telling us to use the liquid form to dissolve the carbon on top of the piston. GM's theory is that carbon builds up on top the piston and on top the compression ring. When the piston reaches the top of the stroke and when the engine is cold, the piston fit is a lot looser in the bore and the piston will "tip" in the bore letting the carbon buildup contact the cylinder wall. This makes the tap noise. This goes away after engine warm up due to the piston fit being much tighter and does not have enough room to "tip". I myself didn't have much faith in the theory until I performed the fix and the noises have completley gone away {for a while}. That is until the buildup comes back. I've pulled the heads on many Gen 3 engines and have been astounded a the carbon that builds up. By the way, higher octane gas such as 93 octane makes the problem of carbon buildup worse. Guess its a neccessary evil. <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />
The proceedure is to remove all spark plugs. Get 2 cans liquid top engine cleaner. Put equal amounts in the cylinders. Let soak for 3 hours only . {Gm engineering has found that if the solution is left overnight the carbon will dissolve and leak past the piston rings and congeal in the oil pan possibly causing oil system problems. They revised the proceedure to only 3 hours.} Then stuff shop rags at the spark plug openings and turn the engine over. The carbon that comes out will suprise you. Then as stated before by HITMANSS perform a oil change. Install the spark plugs. Expect hard starting as the plugs will most likley foul out. Once its running expect heavy smoke and noxious fumes. Rev it up a few times to clear the carbon out and take it for a test run with hard acceleration to clear out the plugs. Let the car run until it completley stops smoking. You don't want carbon trash clogging up your cats. Hope this helps, sorry for being long winded <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Jay
<small>[ November 07, 2002, 10:22 PM: Message edited by: JAY4SPEED ]</small>
As a current fix for common "piston slap" noises, GM is telling us to use the liquid form to dissolve the carbon on top of the piston. GM's theory is that carbon builds up on top the piston and on top the compression ring. When the piston reaches the top of the stroke and when the engine is cold, the piston fit is a lot looser in the bore and the piston will "tip" in the bore letting the carbon buildup contact the cylinder wall. This makes the tap noise. This goes away after engine warm up due to the piston fit being much tighter and does not have enough room to "tip". I myself didn't have much faith in the theory until I performed the fix and the noises have completley gone away {for a while}. That is until the buildup comes back. I've pulled the heads on many Gen 3 engines and have been astounded a the carbon that builds up. By the way, higher octane gas such as 93 octane makes the problem of carbon buildup worse. Guess its a neccessary evil. <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />
The proceedure is to remove all spark plugs. Get 2 cans liquid top engine cleaner. Put equal amounts in the cylinders. Let soak for 3 hours only . {Gm engineering has found that if the solution is left overnight the carbon will dissolve and leak past the piston rings and congeal in the oil pan possibly causing oil system problems. They revised the proceedure to only 3 hours.} Then stuff shop rags at the spark plug openings and turn the engine over. The carbon that comes out will suprise you. Then as stated before by HITMANSS perform a oil change. Install the spark plugs. Expect hard starting as the plugs will most likley foul out. Once its running expect heavy smoke and noxious fumes. Rev it up a few times to clear the carbon out and take it for a test run with hard acceleration to clear out the plugs. Let the car run until it completley stops smoking. You don't want carbon trash clogging up your cats. Hope this helps, sorry for being long winded <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Jay
<small>[ November 07, 2002, 10:22 PM: Message edited by: JAY4SPEED ]</small>
Re: GM top end cleaner? Service mansger at dealership suggest get 2 cans of liquid , pore into plastic bottle ,punch a small hole in end of bottle ,hold finger over hole so you may control the flow of liquid,allow the first can to run into engine slow do not choke it down ,rush about 1/2 of second can into engine >> allow to choke down < let set 10-12 hours then restart and slowly pore ihe last 1/2 can in do not allow to choke down ,run untill stop smooking then run afew minutes more then >>change oil and filter <<
TO pore into engine remove the PVC value onto your plastic bottle tape a short peice of rubber hose and insert where the PVC goes down by the TB
Sorry so long the reply Johnny
TO pore into engine remove the PVC value onto your plastic bottle tape a short peice of rubber hose and insert where the PVC goes down by the TB
Sorry so long the reply Johnny
