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<blockquote data-quote="GaryTJ" data-source="post: 857022" data-attributes="member: 16023"><p><strong>Quoted from Crusty</strong></p><p> </p><p><strong>What does an E.G.R. valve do? Why is it necessary on today's vehicles?</strong></p><p>EGR stands for "Exhaust Gas Recirculation". The EGR valve controls exhaust recirculation into the intake air stream.</p><p>EGR lowers the combustion temperature to prevent nitrogen oxide emissions, which are a major cause of smog. I forget the exact nitrogen compounds in question, and I forget the target temperatur, so sue me :flipoff:</p><p>It is necessary because the EPA says so :flipoff:</p><p> </p><p><span style="font-size: 15px"><span style="color: red">Very good! But if you think about it, it is a good thing to have. You can advance the timing farther without detonation.</span></span></p><p> </p><p><strong>5. Which of the following can NOT cause a cranks/no start condition on a fuel injected engine?</strong></p><p>MAF Sensor, Starter Motor, EGR Valve, Oxygen Sensor</p><p> </p><p><span style="font-size: 15px"><span style="color: red">Good.</span></span></p><p> </p><p><strong>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?</strong></p><p>Mental compression check (listen to cranking), spark, fuel delivery, check plugs for wetting/fouling on a carbed engine, listen for injector pulse on EFI engine.</p><p> </p><p><span style="font-size: 15px"><span style="color: red">That is more than 4, and you got 3 right</span></span></p><p> </p><p><strong>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?</strong></p><p>Spark plug (although who's the tard who did a compression check without checking the plug :haha: ). Next thing would be a crusty injector</p><p> </p><p><span style="font-size: 15px"><span style="color: red">In the right area, I could go with that.</span></span></p></blockquote><p></p>
[QUOTE="GaryTJ, post: 857022, member: 16023"] [B]Quoted from Crusty[/B] [B]What does an E.G.R. valve do? Why is it necessary on today’s vehicles?[/B] EGR stands for "Exhaust Gas Recirculation". The EGR valve controls exhaust recirculation into the intake air stream. EGR lowers the combustion temperature to prevent nitrogen oxide emissions, which are a major cause of smog. I forget the exact nitrogen compounds in question, and I forget the target temperatur, so sue me :flipoff: It is necessary because the EPA says so :flipoff: [SIZE=4][COLOR=red]Very good! But if you think about it, it is a good thing to have. You can advance the timing farther without detonation.[/COLOR][/SIZE] [B]5. Which of the following can NOT cause a cranks/no start condition on a fuel injected engine?[/B] MAF Sensor, Starter Motor, EGR Valve, Oxygen Sensor [SIZE=4][COLOR=red]Good.[/COLOR][/SIZE] [B]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?[/B] Mental compression check (listen to cranking), spark, fuel delivery, check plugs for wetting/fouling on a carbed engine, listen for injector pulse on EFI engine. [SIZE=4][COLOR=red]That is more than 4, and you got 3 right[/COLOR][/SIZE] [B]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?[/B] Spark plug (although who's the tard who did a compression check without checking the plug :haha: ). Next thing would be a crusty injector [SIZE=4][COLOR=red]In the right area, I could go with that.[/COLOR][/SIZE] [/QUOTE]
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