Removes carbon and deposits from injectors, valves, and combustion chambers. Carbon deposits are the result of additives used in modern gasolines to keep them stable and burnable. These necessary chemicals leach out and form substantial collections of carbon. Motorvac or carbon depletion services are recommended for emissions failures, engine pinging problems, rough idle problems, hard starting, hesitation problems and as general preventive maintenance. Failure to perform this service could lead to failed emissions, various performance concerns, lowered fuel economy, engine noises and sometimes — engine damage.