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<blockquote data-quote="GaryTJ" data-source="post: 857629" data-attributes="member: 16023"><p>These are the answers I was looking for. You would have had to have all 10 correct in order to even qualify for an interview.</p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">1. What does an E.G.R. valve do? Why is it necessary on today’s vehicles?</span></span></span></p><p><span style="color: black"></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">__Exhaust gas recirculation, recycles used exhaust gases back into the combustion chamber to dilute the mixture. Because the gas has been burnt once already the gas is for the most part inert. This spreads the molecules which in turn cool’s the combustion and reduces emissions and allows higher timing numbers. The main emissions that are reduced are Nox</span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Although there is evidence proving NOx, in itself, is harmful to humans, the main reason NOx is considered an environmental problem is because it initiates reactions that result in the production of ozone (O3) and acid rain. Ozone is created when nitrogen oxides and volatile organic compounds (VOCs) combine in the presence of sunlight. Plenty of sunlight is needed to create smog, which is why we get more of it in summer than in the winter. In some major urban areas, more than 50% of the ozone forming nitrogen oxides come from vehicles</span><span style="font-family: 'Arial'">. </span></span></p><p><span style="color: black"></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">2. Explain the reason for the A.I.R. system on modern vehicles, describe what it does, and what components make up that system.</span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Air Injection defines a system that introduces fresh air to the exhaust stream. This has been used in many ways, but the primary reason is to help raise the exhaust temperatures, promoting continued combustion of the exhaust gases as they leave the system. Air can be introduced either by way of a belt-driven air pump, or by the natural vacuum that occurs when hot, moving exhaust gases pass an open port. The latter style is usually called <em>reed valve </em>or <em>Pulse Air Injection</em>. In early cars, a thermactor system was used- This basically allowed the hot (partially unburned) gases leaving the exhaust valves a fresh shot of air, causing them to 're- burn' as they left the manifold. Heat was again a primary function in later cars using catalysts, as the catalyst needs to reach operating temperature before it an do its job (see <em>Catalyst</em>), and the fresh shot of oxygen also helps the chemical reaction inside the catalyst. Parts include the pump, routing hoses, solenoids, filters, and manifolds.</span></span></p><p> </p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">3. What is an OBD readiness monitor?</span></span></span></p><p><span style="color: black"></span></p><p><span style="color: black"><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">T</span></span></span><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">he monitors verify the OBD system has completed testing each system. When the vehicle's PCM's monitor completes testing , the readiness system status will be reported as "Ready" or "Complete." Once a monitor is set as "Ready" or "Complete" it will remain in this state unless diagnostic trouble codes (DTCs) are cleared by a scan tool or if the PCM's short term memory is erased by a power failure (i.e., disconnecting the battery). Since the three continuous monitors are constantly evaluating, they will be reported as "Ready" all of the time. If testing of a particular supported non-continuous monitor has not been completed, the monitor status will be reported as "Not Complete" or "Not Ready." You could fail an emission test by just having the codes cleared before you go in and not completing a complete drive cycle.</span></span></p><p> </p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">4. What does the EVAP system do and how can you test for a problem with that system?</span></span></span></p><p> </p><p><strong><span style="font-family: 'Verdana'">Purpose</span></strong><span style="font-family: 'Verdana'">:</span></p><p><span style="font-family: 'Verdana'">An evaporative control system is used to reduce emissions of fuel vapors into the atmosphere by evaporation and to reduce unburnt hydrocarbons emitted by the engine.</span></p><p><strong><span style="font-family: 'Verdana'">Construction</span></strong><span style="font-family: 'Verdana'">:</span></p><p><span style="font-family: 'Verdana'">The system consists of an EVAP Purge Solenoid, a Charcoal Canister, a Pressure Vacuum Filler Cap, and a Rollover and Pressure Relief Valve.</span></p><p><strong><span style="font-family: 'Verdana'">Operation</span></strong><span style="font-family: 'Verdana'">:</span></p><p><span style="font-family: 'Verdana'">The evaporative emission system prevents gasoline vapors in the fuel system from escaping into the atmosphere. When the vehicle is not running, fuel in the fuel tank evaporates. The vapors travel through vent hoses or tubes to be stored in the charcoal canister. Once the vehicle is running, these vapors are drawn into the engine and consumed with combustion gases.</span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Most common test is a smoke test to check for a leak. Beyond that, it would involve electronic component tests.</span></span></span></p><p> </p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black">5. Which of the following can NOT cause a cranks/no start condition on a fuel injected engine?</span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"><em>May be more than 1 correct answer. Circle all possible causes.</em></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black">Spark Plugs Timing belt </span><span style="color: red">MAF Sensor</span></span></span><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"> Ignition Coil</span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"></span><span style="color: red">Starter Motor</span> <span style="color: red">EGR Valve</span><span style="color: black"> Fuel Pump </span><span style="color: red">Oxygen Sensor</span><span style="color: black"> CKP Sensor</span></span></span></p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">(with the exception of o2 heater failure causing the efi fuse to blow (like Toyota’s))</span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">6. What is voltage drop? Explain how to test for it.</span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><strong>Voltage drop</strong> is the reduction in voltage in an electrical circuit between the source and utilitization device. It is measured by using a volt meter in parallel to the curcuit being tested. The most common failures are to the ground side.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black">7. A car comes into the shop and has a p0301 code. Circle all the possible causes.</span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><span style="color: black"></span><span style="color: red">Spark Plug</span><span style="color: black"> Timing Belt MAF Sensor </span></span></span><span style="color: red"><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Ignition Coil</span></span></span></p><p><span style="color: red"><span style="font-family: 'Times New Roman'"><span style="font-size: 12px"></span></span></span><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Starter Motor EGR Valve Fuel Pump Oxygen Sensor CMP Sensor</span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Could also be a vacuum leak or injector problem</span></span></span></p><p> </p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">8. What is the most likely cause of a p0440 code?</span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Gas cap 95% of the time. Never use aftermarket, only OEM</span></span></span></p><p> </p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">9. A car is towed in for a no start. A technician checks it out and says it cranks ok but will not start. What should be the first 4 things checked to narrow down the possible causes of the no start condition?</span></span></span></p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Always on a no start you are missing one of 4 things</span></span></span></p><ul> <li data-xf-list-type="ul"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Spark, not just at the coil but all the way down to each individual plug</span></span></li> <li data-xf-list-type="ul"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Fuel, again not just at the pump, but all the way into the cylinder.</span></span></li> <li data-xf-list-type="ul"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Compression.</span></span></li> <li data-xf-list-type="ul"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Timing, not just spark timing, but cam timing also.</span></span></li> </ul><p></p><p><span style="color: black"></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">10. A Fuel injected vehicle is brought in and has a miss at idle on 1 cyl, but it runs fine over an idle. Power is fine and fuel economy is fine. Compression checks OK. What is the next thing to check and why?</span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Vacuum leak diluting the fuel charge, or erratic spray from an injector not allowing fuel dispersion.</span></span></span></p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">If it runs OK off idle then spark and overall fuel dispersion is OK. If the power and fuel economy are OK, then compression and timing are OK. Just a small vacuum leak can cause a serious misfire at idle.</span></span></span></p><p> </p><p><span style="color: black"><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> </span></span></span></p></blockquote><p></p>
[QUOTE="GaryTJ, post: 857629, member: 16023"] These are the answers I was looking for. You would have had to have all 10 correct in order to even qualify for an interview. [COLOR=black][SIZE=3][FONT=Times New Roman]1. What does an E.G.R. valve do? Why is it necessary on today’s vehicles?[/FONT][/SIZE][/COLOR] [COLOR=black] [SIZE=3][FONT=Times New Roman]__Exhaust gas recirculation, recycles used exhaust gases back into the combustion chamber to dilute the mixture. Because the gas has been burnt once already the gas is for the most part inert. This spreads the molecules which in turn cool’s the combustion and reduces emissions and allows higher timing numbers. The main emissions that are reduced are Nox[/FONT][/SIZE][/COLOR] [SIZE=3][FONT=Times New Roman]Although there is evidence proving NOx, in itself, is harmful to humans, the main reason NOx is considered an environmental problem is because it initiates reactions that result in the production of ozone (O3) and acid rain. Ozone is created when nitrogen oxides and volatile organic compounds (VOCs) combine in the presence of sunlight. Plenty of sunlight is needed to create smog, which is why we get more of it in summer than in the winter. In some major urban areas, more than 50% of the ozone forming nitrogen oxides come from vehicles[/FONT][FONT=Arial]. [/FONT][/SIZE] [COLOR=black] [SIZE=3][FONT=Times New Roman]2. Explain the reason for the A.I.R. system on modern vehicles, describe what it does, and what components make up that system. [/FONT][/SIZE][/COLOR] [FONT=Times New Roman][SIZE=3]Air Injection defines a system that introduces fresh air to the exhaust stream. This has been used in many ways, but the primary reason is to help raise the exhaust temperatures, promoting continued combustion of the exhaust gases as they leave the system. Air can be introduced either by way of a belt-driven air pump, or by the natural vacuum that occurs when hot, moving exhaust gases pass an open port. The latter style is usually called [I]reed valve [/I]or [I]Pulse Air Injection[/I]. In early cars, a thermactor system was used- This basically allowed the hot (partially unburned) gases leaving the exhaust valves a fresh shot of air, causing them to 're- burn' as they left the manifold. Heat was again a primary function in later cars using catalysts, as the catalyst needs to reach operating temperature before it an do its job (see [I]Catalyst[/I]), and the fresh shot of oxygen also helps the chemical reaction inside the catalyst. Parts include the pump, routing hoses, solenoids, filters, and manifolds.[/SIZE][/FONT] [SIZE=3][FONT=Times New Roman] [/FONT][/SIZE] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]3. What is an OBD readiness monitor?[/FONT][/SIZE][/COLOR] [COLOR=black] [FONT=Times New Roman][SIZE=3]T[/SIZE][/FONT][/COLOR][SIZE=3][FONT=Times New Roman]he monitors verify the OBD system has completed testing each system. When the vehicle's PCM's monitor completes testing , the readiness system status will be reported as "Ready" or "Complete." Once a monitor is set as "Ready" or "Complete" it will remain in this state unless diagnostic trouble codes (DTCs) are cleared by a scan tool or if the PCM's short term memory is erased by a power failure (i.e., disconnecting the battery). Since the three continuous monitors are constantly evaluating, they will be reported as "Ready" all of the time. If testing of a particular supported non-continuous monitor has not been completed, the monitor status will be reported as "Not Complete" or "Not Ready." You could fail an emission test by just having the codes cleared before you go in and not completing a complete drive cycle.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman] [/FONT][/SIZE] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]4. What does the EVAP system do and how can you test for a problem with that system?[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [B][FONT=Verdana]Purpose[/FONT][/B][FONT=Verdana]: An evaporative control system is used to reduce emissions of fuel vapors into the atmosphere by evaporation and to reduce unburnt hydrocarbons emitted by the engine.[/FONT] [B][FONT=Verdana]Construction[/FONT][/B][FONT=Verdana]: The system consists of an EVAP Purge Solenoid, a Charcoal Canister, a Pressure Vacuum Filler Cap, and a Rollover and Pressure Relief Valve.[/FONT] [B][FONT=Verdana]Operation[/FONT][/B][FONT=Verdana]: The evaporative emission system prevents gasoline vapors in the fuel system from escaping into the atmosphere. When the vehicle is not running, fuel in the fuel tank evaporates. The vapors travel through vent hoses or tubes to be stored in the charcoal canister. Once the vehicle is running, these vapors are drawn into the engine and consumed with combustion gases.[/FONT] [COLOR=black][SIZE=3][FONT=Times New Roman]Most common test is a smoke test to check for a leak. Beyond that, it would involve electronic component tests.[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [SIZE=3][FONT=Times New Roman][COLOR=black]5. Which of the following can NOT cause a cranks/no start condition on a fuel injected engine? [I]May be more than 1 correct answer. Circle all possible causes.[/I] Spark Plugs Timing belt [/COLOR][COLOR=red]MAF Sensor[/COLOR][/FONT][/SIZE][SIZE=3][FONT=Times New Roman][COLOR=black] Ignition Coil [/COLOR][COLOR=red]Starter Motor[/COLOR][COLOR=black] [/COLOR][COLOR=red]EGR Valve[/COLOR][COLOR=black] Fuel Pump [/COLOR][COLOR=red]Oxygen Sensor[/COLOR][COLOR=black] CKP Sensor[/COLOR][/FONT][/SIZE] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman](with the exception of o2 heater failure causing the efi fuse to blow (like Toyota’s)) 6. What is voltage drop? Explain how to test for it. [/FONT][/SIZE][/COLOR] [SIZE=3][FONT=Times New Roman][B]Voltage drop[/B] is the reduction in voltage in an electrical circuit between the source and utilitization device. It is measured by using a volt meter in parallel to the curcuit being tested. The most common failures are to the ground side.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman][/FONT][/SIZE] [SIZE=3][FONT=Times New Roman][COLOR=black]7. A car comes into the shop and has a p0301 code. Circle all the possible causes. [/COLOR][COLOR=red]Spark Plug[/COLOR][COLOR=black] Timing Belt MAF Sensor [/COLOR][/FONT][/SIZE][COLOR=red][FONT=Times New Roman][SIZE=3]Ignition Coil [/SIZE][/FONT][/COLOR][COLOR=black][SIZE=3][FONT=Times New Roman]Starter Motor EGR Valve Fuel Pump Oxygen Sensor CMP Sensor [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]Could also be a vacuum leak or injector problem[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]8. What is the most likely cause of a p0440 code? Gas cap 95% of the time. Never use aftermarket, only OEM[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]9. A car is towed in for a no start. A technician checks it out and says it cranks ok but will not start. What should be the first 4 things checked to narrow down the possible causes of the no start condition?[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]Always on a no start you are missing one of 4 things[/FONT][/SIZE][/COLOR] [LIST] [*][SIZE=3][FONT=Times New Roman]Spark, not just at the coil but all the way down to each individual plug[/FONT][/SIZE] [*][SIZE=3][FONT=Times New Roman]Fuel, again not just at the pump, but all the way into the cylinder.[/FONT][/SIZE] [*][SIZE=3][FONT=Times New Roman]Compression.[/FONT][/SIZE] [*][SIZE=3][FONT=Times New Roman]Timing, not just spark timing, but cam timing also.[/FONT][/SIZE][/LIST][COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black] [SIZE=3][FONT=Times New Roman]10. A Fuel injected vehicle is brought in and has a miss at idle on 1 cyl, but it runs fine over an idle. Power is fine and fuel economy is fine. Compression checks OK. What is the next thing to check and why? Vacuum leak diluting the fuel charge, or erratic spray from an injector not allowing fuel dispersion.[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman] [/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]If it runs OK off idle then spark and overall fuel dispersion is OK. If the power and fuel economy are OK, then compression and timing are OK. Just a small vacuum leak can cause a serious misfire at idle.[/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman][/FONT][/SIZE][/COLOR] [COLOR=black][SIZE=3][FONT=Times New Roman]:D :D :D :D [/FONT][/SIZE][/COLOR] [SIZE=3][FONT=Times New Roman] [/FONT][/SIZE] [/QUOTE]
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