Michigan SOS Mechanic Engine Tune-up Questions and Answers The engine vacuum is low but steady - ~ ANSWER ~ Retarded Timing The Purpose of catalytic converter - ~ ANSWER ~ oxidize hc co into c02 and h20 What vehicles are designed to go into a closed loop operation when - ~ ANSWER ~ all of the above Diagram shows a vacuum hose connected to "p vacuum" this means the hose should be connected - ~ ANSWER ~ above the throttle plate 1 / 2
If the voltage spike is not high enough on one cylinder, what is the most likely source of the problem. - ~ ANSWER ~ a failed spark plug wide-open-throttle the power train control module reverts - ~ ANSWER ~ open loop, rich mixtures during a cylinder leakage test air escaping through the throttle body means there is a leak at - ~ ANSWER ~ the intake valve higher than normal oxides of nitrogen (n0x) emissions may be caused by - ~ ANSWER ~ all of the above A reading of 8 volts on meter 2 while cranking would indicate - ~ ANSWER ~ an excessive ground circuit voltage drop
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