Podcast
Questions and Answers
What is the effect of decreasing volume of the cylinder during the combustion cycle?
What is the effect of decreasing volume of the cylinder during the combustion cycle?
- No effect on pressure
- Increase in temperature
- Increase in pressure (correct)
- Decrease in pressure
How does abnormal combustion impact engine performance?
How does abnormal combustion impact engine performance?
- Has no effect on performance
- Improves performance
- Reduces performance (correct)
- Stabilizes engine operation
What is the normal range of engine vacuum at idle?
What is the normal range of engine vacuum at idle?
- 0-5 inches Hg
- 15-22 PSI
- 15-22 inches Hg (correct)
- 1-10 PSI
Why should fuel and ignition systems be disabled during cranking compression testing?
Why should fuel and ignition systems be disabled during cranking compression testing?
What is the purpose of cranking the engine through one compression stroke during compression testing?
What is the purpose of cranking the engine through one compression stroke during compression testing?
How can poor cylinder seal affect engine performance?
How can poor cylinder seal affect engine performance?
What does the Knock Sensor do?
What does the Knock Sensor do?
How does the Mass Air Flow (MAF) Sensor respond to changes in air density?
How does the Mass Air Flow (MAF) Sensor respond to changes in air density?
What function does the Throttle Position (TP) Sensor primarily control?
What function does the Throttle Position (TP) Sensor primarily control?
Which sensor is responsible for adjusting the air-fuel ratio based on air density?
Which sensor is responsible for adjusting the air-fuel ratio based on air density?
What is the purpose of the Fuel Tank Pressure Sensor?
What is the purpose of the Fuel Tank Pressure Sensor?
How does the Manifold Absolute Pressure (MAP) Sensor respond to low manifold pressure?
How does the Manifold Absolute Pressure (MAP) Sensor respond to low manifold pressure?
What role does the Ignition Reference Signals play in engine control?
What role does the Ignition Reference Signals play in engine control?
What should the first 'puff' pressure reading be in relation to the reading after 4 'puffs' during cranking compression analysis?
What should the first 'puff' pressure reading be in relation to the reading after 4 'puffs' during cranking compression analysis?
What does low pressure on the first 'puff' and inconsistent pressure build indicate during cranking compression analysis?
What does low pressure on the first 'puff' and inconsistent pressure build indicate during cranking compression analysis?
What is the recommended test to verify low compression in an engine?
What is the recommended test to verify low compression in an engine?
What could be indicated by low compression that doesn’t build up on remaining 'puffs' and does not improve with a wet test?
What could be indicated by low compression that doesn’t build up on remaining 'puffs' and does not improve with a wet test?
What can be suspected when there is low compression in two adjacent cylinders?
What can be suspected when there is low compression in two adjacent cylinders?
What is the purpose of a Cylinder Leakage test?
What is the purpose of a Cylinder Leakage test?
What should be done during a Cylinder Leakage test to isolate the cause effectively?
What should be done during a Cylinder Leakage test to isolate the cause effectively?
When should the Cylinder Leakage test be performed?
When should the Cylinder Leakage test be performed?
What should be the position of the piston during the Cylinder Leakage test for it to be effective?
What should be the position of the piston during the Cylinder Leakage test for it to be effective?
Why is it recommended for the engine to be warm during the Cylinder Leakage test?
Why is it recommended for the engine to be warm during the Cylinder Leakage test?
What does the PCM stand for in the automotive context?
What does the PCM stand for in the automotive context?
Which component is responsible for converting CO, HC, and NOx into water, carbon dioxide, and nitrogen in a vehicle?
Which component is responsible for converting CO, HC, and NOx into water, carbon dioxide, and nitrogen in a vehicle?
What does the AIR system provide to the exhaust stream to help lower HC & CO emissions?
What does the AIR system provide to the exhaust stream to help lower HC & CO emissions?
What is the purpose of the ORVR system in a vehicle?
What is the purpose of the ORVR system in a vehicle?
What does PCM use to control the air/fuel ratio based on O2 feedback when the engine is at specified temperature?
What does PCM use to control the air/fuel ratio based on O2 feedback when the engine is at specified temperature?
Which type of memory found in PCM stores temporary data but gets erased when power is lost?
Which type of memory found in PCM stores temporary data but gets erased when power is lost?
In which mode of operation does the PCM determine an initial air/fuel ratio and deliver one injector pulse per RPM reference pulse?
In which mode of operation does the PCM determine an initial air/fuel ratio and deliver one injector pulse per RPM reference pulse?
What is the main role of the PCV system in a vehicle?
What is the main role of the PCV system in a vehicle?
What is the purpose of the serial data transmitted by ECMs in vehicles?
What is the purpose of the serial data transmitted by ECMs in vehicles?
