It is well known that injector blockages and intake valve deposits contribute to emissions. Differences between injector flow rates are particularly important because the oxygen sensor controls fuel flow into the engine. While one injector may be injecting too little fuel, the oxygen sensor will instruct the engine's computer to have all injectors put more fuel into the engine. This degrades performance, reduces fuel economy and increases exhaust emissions.
Deposits form on intake valves and ports because they operate at high temperatures in a very reactive environment whenever the engine is running. If the deposits become heavy, they reduce engine power because they restrict and alter the flow of air and fuel into and within the cylinder.
In some sensitive fuel-injected engines, even low levels of intake valve deposits can harm performance. Cold-start and warm-up drivability can be adversely affected and exhaust emissions increase.
The magnitude of the emissions increase can be surprisingly large. This occurs because the deposits act somewhat like a sponge, absorbing and then releasing fuel, which upsets the ratio of fuel and air, particularly as the engine is changing speed. Other valve deposit problems include valve sticking because deposits interfere with the valve stem sliding in its guide. Another problem involves burned valves because severe deposits prevent the valve from seating properly.
Caltex with Techron® is proven at keeping fuel systems clean. The unique formulation also minimises any contribution to harmful combustion chamber deposits which can cause increased emissions of nitrogen oxides.