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For non-turbo engines, the intake valve is rarely a problem. Gasoline injectors located behind the vlaves wash back of the intake, and any residues will be effectively removed. Gasoline is an excellent solvent. The intake valve is a problem for turbo engines because the injectors are located inside the chambers. The back of valves never get chance to be cleaned. To make the matter worse, some turbo 'recycles' a small portion of exhaust to reduce emissions and therefore, more residues depositson the back of intake ....
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