Again this is just my opinion but I believe there is a time and place for throttle body services. Chances are you would be asking for one if you really needed it, instead of being up sold the service during a scheduled oil change. For one thing the engine control module is capable of compensating for some deposits.
Cleaning carbon from the cylinder
Removing carbon from the top of the piston is surprisingly harder than you would think. Many times I have seen mechanics try many methods such as different kinds of chemical additives or even squirting a water mist in the air intake to steam clean the chamber.
Water injection is effective at reducing carbon but before it is built up on top of the piston to the point where it is causing a problem. There are several ways to remove or at least reduce these carbon deposits. Yes in my opinion once again the best way is to disassemble the engine and physically remove the carbon with a scraper or a wire wheel.
Probably the most common method would be to add some kind of chemical to the fuel. Some of these work better than others but all of them work very slowly at reducing these carbon deposits which may not be helpful if you are experiencing a problem like engine ping.
These shells collide with the top of the piston and all areas of the combustion chamber without removing the cylinder heads. It does an amazing job at removing the carbon deposits. The problem is finding a repair center that really has one. The set up of one of these things is still labor intensive but also very interesting.
In most cases to use a carbon blaster the intake manifold and sparkplugs are removed. On some engines the injector can be removed instead of taking off the whole intake manifold. The output hose of the carbon blaster is attached to a cylinders intake port or inserted into the fuel injector hole.
The extraction hoses from the carbon blaster are inserted into the sparkplug bore which allows the walnut shell particles to be removed from the piston and combustion chamber area without getting down into the crankcase.
Carbon is a byproduct of combustion. Today’s engines run much more efficiently than the carbureted models years ago. Add to that the improved fuel blending that contains less impurities and today's engines produce less carbon than ever before. It may still at some point be necessary for you to take action against the carbon deposits in your engine but remember that when this is necessary they are usually accompanied by noticeable symptoms.
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