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.
If the thermostat has a jiggle valve, it should be placed toward the top to allow air to escape. If ...
Reinstall the spark plug wires and all brackets that were removed to gain access to the valve ...
Checking the fuel pressure using a fuelpressure gauge connected to the Schrader valve.
An OBD-II active test. The PCM opens the EGR valve and then monitors the MAP sensor and/or engine ...
Regurgitation or insufficiency valve disease