SOS Mechanic Certificate -Engine Tuneup/Performance & Brakes Complete Exam

SOS Mechanic Certificate -Engine Tuneup/Performance & Brakes Complete Exam Study Guide with Expert Graded A+ Answers 1. The engine vacuum is low but steady - ANSWER Retarded Timing 2. The Purpose of catalytic converter - ANSWER oxidize hc co into c02 and h20 3. You are checking the 02 during closed loop 450 to 500 - ANSWER the sensor is sluggish and probably bad 4. You have examined a set of spark plugs and found white - ANSWER The plug heat range is too hot 5. With the vehicle operating temp and running at 2000rpm - ANSWER oxygen sensor running rich 6. What vehicles are designed to go into a closed loop operation when - ANSWER all of the above 7. Diagram shows a vacuum hose connected to "p vacuum" this means the hose should be connected - ANSWER above the throttle plate 8. 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 9. wide-open-throttle the power train control module reverts - ANSWER open loop, rich mixtures g a cylinder leakage test air escaping through the throttle body means there is a leak at - ANSWER the intake valve r than normal oxides of nitrogen (n0x) emissions may be caused by - ANSWER all of the above 12.A reading of 8 volts on meter 2 while cranking would indicate - ANSWER an excessive ground circuit voltage drop ion control systems are installed on engines to reduce what 3 specific exhaust products - ANSWER Hydrocarbons, carbon monoxide and oxides of nitrogen 14.You have verified a slow cranking complaint, which of the following should you do next - ANSWER Determine the condition of the battery 15.The Egr System is designed to - ANSWER cruise 16.You are monitoring the tps signed voltage digital volt ohm - ANSWER A smooth voltage increase to about 4.5 v electronic fuel injected system that sprays into the throat of intake - ANSWER a throttle body injections system 18.What is the function of the egr valve - ANSWER it recalculates exhaust gasses into the intake 19.A customer brings vehicle to you with a concern of low power - ANSWER all of the above 20.A car with dis will not start - ANSWER A defective or misalignment crank sensor 21.How is fuel pressure controlled in a electric efl - ANSWER Engine vacuum 22.A vehicle with OBD 2 is being check for poor performance and low power with check engine light flashing - ANSWER detecting a misfire condition 23.A weak ignition coil would most likely - ANSWER B 24.A car will not start because of spark - ANSWER Check for primary circuit at coil 25.You suspect that the timing chain or belt is jumped or broken - ANSWER all of the above 26.If the ignition timing will not advance past base timing - ANSWER vehicle in limp mode 27.When spark Knock occurs - ANSWER The knock sensor signals microcomputer retard 28.When the microcomputer monitor air flow - ANSWER the proper amount of fuel can be supplied 29.The power train control module used the TPS - ANSWER fuel pressure 30.A high gas level or heavy float in carberated - ANSWER Rich mixture 31.What increases the production of oxipes - ANSWER high combustion temp 32.On a OBD 2 system a loose gas cap - ANSWER The malfunction indicator lamp turns on 33.A reading of 1v on meter number 1 cranking - ANSWER Do acceptable voltage drop 34.A tech is working on a car that has strong fuel odor - ANSWER Stuck open canister purge valve 35.Higher voltages are required to fire signal - ANSWER the air fuel mixture ratio is made leaner 36.Which of the following is true regarding fault codes - ANSWER fault codes can be generated from past failures 37.A lean air fuel mixture could be - ANSWER a leaking intake manifold 38.Electronic fuel injection is best described by which - ANSWER electromagnetic raises the plunges in