Ever hear of "GM upper end cleaner" ?
 

I'm told you buy this at a GM dealer. You run your engine and warm it up...then pour the cleaner in slowly while running. Then shut the motor off for at least 20 minutes. Then start it up and all of the carbon is suppose to be expelled for the cylinders and pistons out through the exhaust. Anyone know anything about this ?

Merc sells it as well. Works good on an engine that has a lot of carbon built up so they say. Look in a spark plug hole and see if you need it.

are you trying to get rid fo the "cold start knock" in a 6.0 ltr. motor????

I've heard chevy recommend this before.

No cold start knock
 

No, I have 540 bulldogs and I've experienced fouling out plugs due to running so rich. I've changed the primary and secondary jets and I thought I would try this stuff. I'm still running rich.

hey guys just take and old spray bottle and put water in it and with the motor running spray in carb or air intake and it will I promise clean the inside to a polished clean ,its unreal everything is clean ,just add enough throttle to keep it from cutting off and spray healthy amounts in ,,windsheild cleaner with achol and soap does the best as it has distilled water ,achol ,soap and is cheap .Fromula fasttech did this on the board then pulled the heads and about fell over it was so clean :D :D :D

bobby...


WHAT?!?!?!?!?

It's called top end cleaner (part number 000001 or something like that).

Works great if done right, removes carbon from the top end and won't hurt the injectors. Once you find a line with constant vacuum the tough part is keeping the engine running long enough to suck the bottle down. Good luck with it.

Bobby's right.
It's an age-old trick that works! A fine-mist sprayer is the key. It's like steam-cleaning your carpet...kinda...well, not really...:D

It attacks carbon by cooling it rapidly, it then flakes off and disolves.

djm has it right......you can also go to NAPA and get sea-foam........Dodge also has their version of it but cant remember the name off hand.
As for runnning it through the engine on a car....best place i have found for a good vacume source is to pull the power brake assist hose and pour it through there......or if you have a PCV valve hose attachment on the intake hose thats another good place.......only remember NOT to introduce the chemical into the intake before the MAF consor!!! :eek:

A/C Delco part number for Kleens liquid bottle( it comes in spray cans too) is 992872. This is a stronger version of GM Top Cleaner.

So you are telling me I can pull off the Flame Arrestor on my 500EFI, mist in some distilled water, and maybe gain a few ponies?

Yep, it should be good for something, if the existing problem is carbon buildup, as with plug-fouling or a blocked valve.

I use to do the old water trick back in the day when i was drag racing my daily driver every weekend, it really does work.

Gm part #1050002 Top Engine Cleaner. $8-$9 a bottle.;)

SYDWAYS its killer it works great to clean upper valves,pistons ,plugs, ect they will look new if you use enough water :D :D :D

It's FREE and it don't cause smoke! I'd say it just doesn't get better than that. Did he say FREE? :cool:

Water works well. Most engines will clean themselves up if run at high rpm's for a while. Carbons not a typical problem for a performance engine unless you have carb problems or burn oil. If you are carboned up I would use the water mist, with the engine at operating temperature, then take it out and run it WOT for a while.

If you ever pull the heads off of an engine and find a real clean spot on top of some pistons, you'll find an exhaust manifold or riser leaking water onto the piston. So it only makes sense that water sprayed into the carb will clean all of the pistons. Merc also sells their version, used to be called engine cleaner. Valve Tek has one too.

Does this work for that? I've been noticing that damn knocking more and more lately.

Not sure if it works for this or not??? I was also hoping to find out because mine 6.0 knocks for about 20 secs. When first started. I've reseached it, and found that Chevy says it's normal
:confused: , and it will not affect the life of the motor. Other people say it's carbon buildup, and to try the top end cleaner. Others have said it's piston slap.

Anyone else have problems with the 6.0 knocking at start up ??

I you go onto any of the Suburban/tahoe chat rooms, you will find that many people are *****ing about "piston slap" on the 5.3 and 6.0 engines. GM says it is normal, but from what I heard, it is from the piston skirts not being long enough on these engines. GM has a revised piston they say corrects the problem, but there is no recall on this because they say the "piston slap" won't effect wear. I don't own one of these engines, but I do know that there are a lot of pist off/concerned GM truck owners with these motors that don't seem happy.

With 40,000 miles, mine knocks quite a bit for atleast a minute or two. It seems to be getting worse as time goes on. It used to only do it in the mornings but now it does it after just letting it sit for an hour or so. With all this noise, I should have just got the Duramax! (I'm wishing I would have done that anyway!!)

I've heard some people that tried the top-end cleaner to reduce the knock but I don't think it helped much. There used to be a "GM Piston Slap" website but it doesn't seem to exist anymore. I know GM threatened the owner of the website on more than one occasion - not sure what ever happened.

ALITTLE THICKER OIL AND A/C FILTER HELP ALITTLE