<VV> carbon removal

[Frank DuVal]

I like GM Top Engine cleaner also.

But, if one needs to clean carbon now, not after a trip to the dealer, 
just use water!

Water will not soak the crud out of the intake system like the GM 
cleaner, but it WILL clean carbon out of the combustion chamber.

Remove air cleaner/assembly to expose carb throats. Start engine. Pour 
water out of a soda (pop) bottle slowly at first, then add throtle and 
more water keeping a balance of engine running about 1k rpm and 
increasing throttle opening. One could go all the way to full throttle 
and still keep rpms low with the water.

BIG WARNING> Do not stall engine and pour water into the stopped engine. 
It will be hydrolocked! If this happens, do not try to start the engine. 
Remove all 6 spark plugs and spin engine (with starter is fine) to blow 
water out of the cylinders. Cranking a hydrolocked engine can bend rods, 
etc. This warning would apply to GM cleaner also.

My aunt drove a 283 Chevelle. It developed a hard knock. Yep, knock was 
gone after service station did the water trick. Obviously she did all 
around town to and from work driving only. If I had the car it wouldn't 
have developed that problem. My cousin didn't either after he got the 
car. ggg

Frank DuVal




On 3/2/2013 11:44 AM, hank kaczmarek wrote:
> If you are rebuilding the engine, the route that Mark and Matt recommended
> are fine.
>
> How about if you just want to clean the stuff and keep the engine together?
>
> GM TOP END CLEANER---Available in spray cans from the General.
>
> Remove spark Plugs and blast some down each hole.  Let it sit 24 hours.
>
> Then with the Air Cleaner Ass'y removed, Fire up the car----Going to smoke
> more than a little.
>
> Then , while goosing the throttle by the linkage, spray half to 3/4 of a can
> down each carb throat---Car will smoke like a Freight Train through the
> exhaust.
>
> When it's done smoking, it will begin to purr.  Best thing to do to clean
> out the carbon---could also use it BEFORE dismantling engine if engine in
> running order before rebuild.