What is the purpose of the roll-out switches?
A) to shut the gas valve off if flames roll out of the combustion area
B) to shut of the gas valve if the flames do not light within a few seconds
C) to shut off the gas valve if the air leaving the furnace becomes too hot
D) to coordinate the fan operation with the normal flame rollout on the furnace
Question 2
How is a concentric vent used in a high-efficiency furnace?
A) It creates two close exit points for the vent pipe and combustion air pipe.
B) It allows the vent pipe to combine with condensate drainage.
C) It directs the combustion air pipe to an outdoor exit.
D) It allows a single outdoor exit point for the vent and combustion air pipe.
The camshaft is rotated in relation to the camshaft by the PCM to provide changes in valve timing.
A vane phaser is used to move the camshaft using changes of oil pressure from the oil control valve.
A steady but low reading could indicate retarded valve or ignition timing.
Reinstall the valve cover being careful to not pinch a wire or vacuum hose between the cover and ...
Checking the fuel pressure using a fuelpressure gauge connected to the Schrader valve.
Mitral valve prolapse