ASE A8 Engine Performance Review Questions with Answers

A hesitation on acceleration can be caused by? A faulty Throttle position sensor A leak in the vacuum hose to a MAP sensor may cause? A higher-than-normal reading from the sensor and can cause hesitation during acceleration Tools that can be used to diagnose emission faults without a DTC. Power graphing multi meter, labscopes, and graghing scan tools Computer, sensor power feeds, grounds, and signal wires can be tested with a? DMM Sensor and actuator waveform analysis can be performed with? Digital Storage Oscilloscopes Fuel injectors, O2 Sensors are tested most effectively with? Waveform analysis What issues may a stuck open PCV valve cause on a carburetor engine? Excessive air flow through valves which can cause a lean air/fuel ration and possible rough idle, or stalling of engine What issues may a stuck open PCV valve cause on a fuel injected engine? High idle speed complaint Oil accumulation and crankcase blow-by gases may be found in the air cleaner housing due to? Worn piston rings and cylinders What tester may be used to test for excessive engine blow-by? Flow meter style tester What must be visually inspected on a PCV valve system? Inspect the cap, tubes, and hoses for kinks, cuts or other damage What must be confirmed in order to replace the PCV valve? Shake the valve next to your ear and listen for valve rattle. If no rattle is heard, replacement is needed. Proper operation of EGR valve The valve should open once the engine is warm and run above idle or under road load conditions