ASE A8 Engine Performance – Sample

A no-start condition is being diagnosed on a vehicle equipped with a distributor ignition using a remotelymounted ignition coil. The coil wire is removed from the center of the distributor cap and a spark tester is used to check for spark. There is spark out of the coil but no spark is available to any of the spark plug wires. Technician A says the rotor could be defective. Technician B says the spark plugs are fouled. Which technician is correct?

Which of the following is LEAST likely to result in a rich air fuel ratio?

All of the following are necessary to complete the injector cleaning process EXCEPT:

Which of the following should be the first step in diagnosing an engine performance concern?

On an oscilloscope raster display of the secondary ignition system, the most likely cause of an 8 to 10 degree dwell variation between cylinders would be:

All of the following are true of ignition module replacement EXCEPT:

Two technicians are discussing OBD code P0301. Technician A says the P in the code stands for powertrain. Technician B says the 0 in the code means it is manufacturer specific. Who is correct?

An engine is idling too fast when the engine reaches operating temperature. Technician A says the engine could have a vacuum leak. Technician B says that the throttle linkage or cable could be stuck. Which technician is correct?

Two technicians are discussing a four wire oxygen sensor. Technician A says this oxygen sensor contains a heater circuit. Technician B says the engine’s control module uses the oxygen sensor’s voltage signal to adjust the air fuel ratio in closed loop. Who is correct?

An EFI engine stalls and then starts back up. Sometimes it takes several tries to start. Technician A says a loose connection at the crankshaft position sensor would result in this condition. Technician B says an open at the crankshaft position sensor would result in this condition. Who is correct?