SOS Mechanic Certificate -Engine Tune -Up/Performance Questions And Answers The engine vacuum is low but steady Retarded Timing The Purpose of catalytic converter oxidize hc co into c02 and h20 What vehicles are designed to go into a closed loop operation when all of the above Diagram shows a vacuum hose connected to "p vacuum" this means the hose should be connected above the throttle plate If the voltage spike is not high enough on one cylinder, what is the most likely source of the problem. a failed spark plug wide -open -throttle the power train control module reverts open loop, rich mixtures during a cylinder leakage test air escaping through the throttle body means there is a leak at the intake valve higher than normal oxides of nitrogen (n0x) emissions may be caused by all of the above A reading of 8 volts on meter 2 while cranking would indicate an excessive ground circuit voltage drop emission control systems are installed on engines to reduce what 3 specific exhaust products Hydrocarbons, carbon monoxide and oxides of nitrogen You have verified a slow cranking complaint, which of the following should you do next Determine the condition of the battery The Egr System is designed to cruise You are monitoring the tps signed voltage digital volt ohm A smooth voltage increase to about 4.5 v an electronic fuel injected system that sprays into the throat of intake a throttle body injections system What is the function of the egr valve it recalculates exhaust gasses into the intake A customer brings vehicle to you with a concern of low power all of the above A reading of 1v on meter number 1 cranking Do acceptable voltage drop You are checking the 02 during closed loop 450 to 500 the sensor is sluggish and probably bad A car with dis will not start A defective or misalignment crank sensor How is fuel pressure controlled in a electric efl Engine vacuum A vehicle with OBD 2 is being check for poor performance and low power with check engine light flashing detecting a misfire condition A weak ignition coil would most likely B A car will not start because of spark Check for primary circuit at coil You suspect that the timing chain or belt is jumped or broken all of the above If the ignition timing will not advance past base timing vehicle in limp mode When spark Knock occurs The knock sensor signals microcomputer retard When the microcomputer monitor air flow the proper amount of fuel can be supplied
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