First, valves, combustion chamber deposits:

   Decided by EFI engine control features, each time work is the first cylinder fuel injection re-ignition, the moment when we turn off the engine ignition is shut off immediately, but this work cycle sprayed gasoline can not be recovered, can only be attached to the intake valve and combustion chamber walls, gasoline is likely to be volatile, car engine clean but gasoline has stayed on wax and varnish, wax and long run gasoline piled thick varnish, after repeated heating hardens to form a coke. Poor If the engine burning oil or petrol filling quality of impurities, then the valve is even more serious and the formation of coke and faster. 

  Because carbon sponge-like structure, when the valve after the formation of coke fuel injected into the cylinder for each part will have to be adsorbed, so that the real concentration of the mixture into the cylinder thinning, resulting in poor engine work, there difficulty in starting, idling is not stable, poor acceleration, emergency refueling tempering, excessive exhaust, fuel consumption increases and other anomalies. engine cleaning system If another serious cause valve closed lax, failing to make a cylinder cylinder pressure and completely does not work, even blocking the valve so that it does not return. At this valve and piston movement will produce interference, and ultimately damage the engine.

Second, the intake manifold coke:

  Since the entire work of the various piston engines are not synchronized, when the engine is off, some of the cylinder intake valve is not fully closed, some of the continuous evaporation of unburned fuel oxidation, in particular the throttle valve in the intake pipe to produce some of the more rearward soft black soot. cleaning car engine On the one hand these coke make the intake pipe wall roughening, the intake vortex generated in these rough areas, affecting the quality of the air intake and the effect of the mixed gas. 

  On the other hand, these carbon deposits can block the channel so that the idle speed control device idle catching or beyond its adjustment range, so that will cause low idle, idle shaking, speed various ancillary devices are malfunctioning, oil revenues off the car, exhaust exceeded, charges oil phenomenon.

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