Intake Valves and Ports
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 hurt performance. Cold-start and warm-up drivability can be adversely affected and exhaust emissions increase.
Intake valves after 10,000 miles with and without Techron
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, and burned valves-because severe deposits prevent the valve from seating properly.
