Results of Incorrect Operation

An open boost control solenoid control circuit, an open ignition 1 circuit, or boost control solenoid valve stuck open will cause reduced engine power, especially during wide open throttle operation.

If the boost control solenoid control circuit is shorted to ground, the boost control solenoid valve is stuck closed or a restriction in the boost source or signal hoses will cause full boost to be commanded at all times and a possible overboost condition during high engine load situations.

A restriction in the exhaust system may cause an overboost condition and reduced fuel economy.

A restriction in the vacuum signal hose to the bypass valve actuator or a stuck closed bypass valve will cause a noisy idle and reduced fuel economy.