Egr open lean - Study guides, Class notes & Summaries

Automotive Engine Performance Post Test Review Already Passed Magnetic pulse generators are commonly used to send data to the computer about: The speed of the monitored component. Technician A says pulse width modulation (PWM) is measured in a length of time, not a percentage of a cycle. Technician B says that the cooling fan relay is usually controlled by the PCM through PWM. Who is correct? Both A and B When the pressure in the intake manifold increases the fuel pressure regulator on a port ...

an engine miss is being diagnosed using a cylinder leakage test. Technician A says that any cylinder with over 20% leakage has excessive leakage. Tech B says that air leaking from the tailpipe indicates a cracked cylinder. A only, B only, A & B, Neither . A only: If cylinder leakage exceeds 20%, check for air escaping the tailpipe, the PCV valve opening in the rocker arm cover, and the top of the throttle body or carburetor. Air leaking from the tailpipe usually indicates an exhaus...

2. A technician is checking for piston ring groove clearance. The proper technique includes A. The old ring and a feeler gauge. B. The new ring and a feeler gauge. C. Only a feeler gauge. D. No feeler gauge is required. Answer B is correct. Clean the pistons in a cold tank and then clean the grooves with a ring groove cleaner before measuring. 3. A cylinder power balance test is being performed on a vehicle with sequential fuel injection. The number five cylinder's rpm drop is less ...

A8 Engine Performance Practice Test Graded A+ PCV System What should happen when performing a PCV valve test? The valve should rattle when shaken back and forth. What is the purpose of the PCV valve test? To check if the valve is functioning properly. What tool is used to perform the PCV valve test? A rattle test. What happens when performing a snap-back test on a PCV valve? The plunger snaps back when pressed with the thumb. What tool is used to check for crankcase vacuum at...

If the compression is 5 psi and the oem spec is 140 psi, what most likely is the cause? A, worn piston ring. B, burnt valve. - ANSWER Both A and B What most likely is the cause if the compression doesn't go up during a wet compression test? A, burnt valve. B, worn piston ring. - ANSWER A What most likely is the cause if the compression goes up during a wet compression test? A, burnt valve. B, worn piston ring. - ANSWER B 2. Blue smoke is coming from the exhaust pipe of a ve...