What is a redundant gas valve?
A) a gas valve that has no real purpose
B) a gas valve that was once necessary on older furnaces but is no longer used
C) a gas valve that is used in case the main valve quits working
D) a gas valve with two valves mechanically in series
Question 2
What could cause the tungsten electrode to turn gray or blue?
A) The operator had only 1/4 to 1 inch stick out, and that is not enough to prevent electrode burning.
B) Not enough electrodes stick out.
C) Answers A and B are both correct.
D) Not enough post flow
E) Too much post flow
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Use a torque wrench and torque the valve cover retaining bolts to factory specifications.
A vacuum-operated EGR valve. The vacuum to the EGR valve is computer controlled by the EGR valve ...
The EGR valve pintle is pulse-width modulated and a three-wire potentiometer provides ...
Stenotic valve disease.