Thank you for making this video. It helped me ace the A8R Engine Performance ASE Test yesterday. This was only the third time I've aced an ASE test since 1979.
All your videos are very informative. Thank you for putting out videos of what it’s like to sit in a automotive lecture. Reminds me of being back in college and has really helped me prepare for ASE tests!!!
I think I figured out why you have so few subscribers,the name of the channel is the problem.I think you need to rename the channel to Automotive something and you will get a lot more subscribers!I'm lucky to have stumbled upon your channel.Your a great teacher people need to find you !
Hi I am having a problem with a car and I am really hoping you can help me. I have a 2011 Chevy Cruze 1.4l turbo. The codes I have been getting are a p0341 cps range performance and a p0171 fuel trim system lean. Another shop changed the intake gaskets, the injector o-rings and the purge valve and were unsuccessful so now it is here. Upon driving it I noticed the codes would come up as pending and go away before they would set as a hard code which I thought was weird. Wile I was looking at the intake side and testing that cam sensor while it was running I noticed it was vibrating like something was hitting it. I took the valve cover off and noticed the reluctor ring was coming into contact with the sensor putting a grove in it. The guy next to me suggests to bend it straight. We managed to do that without braking it but when I started it up it seemed to be running a little rough. I drive the car home for the night to see if the code re appears. Just the p0171 code comes back. The freeze frame data is as follows distance since first malfunction 15mi, distance since last malfunction 24mi, Short term-3 Long term 30 MAF 2.85gps IAT 78.8F HO2S1 .77V HO2S2 .77V TPS 14.4 Ambient temperature 39F BARO pressure 99.0kpa My thinking is the reluctor ring being bent is causing the sensor to read improperly causing these issues. I think that is my best guess because that is the only part I found to be defective. Is am hoping you can help me!!! Know one at my shop is a master tech and I am the best shot this car has. I am tired of driving it to set all the monitors lol I am thinking it is this but the job is very labor intensive and before I do the job on Monday I was hoping you can read this post and give me some advice. Thank you for your time and have a nice day!!!!
I believe you've fixed the Cam Sensor issue by straightening the bent reluctor. But From the fuel trim readings you're getting on the Freeze Frame (+30 LFT) it seems that you still have a lean condition - I see 14.4 TPS, but no engine load or vehicle speed. Typically that engine should, at idle, be showing something like 1.4 grams per sec, depending on prevailing barometric pressure. If the MAF is skewed a bit (and it's impossible to tell by that Freeze Frame Data), it can cause that lean condition; I'd be interested in knowing what the fuel trim readings do if you do a total PCM reset - remove the battery terminals and touch the cables together - then let it start over. If you still have a lean condition driving the fuel trims rich, it'll show up first in the Short Fuel Trim readings as soon as it closes loop and then the long term fuel trims will follow until the short fuel trims return to zero - I'd be using a smoke machine to check for air leaks in and around the intake, injectors, etc. But again, if the MAF reading is skewed to under-report airflow or report a higher altitude in the BARO reading than is accurate, the commanded injector pulse width will be too low and the O2 sensors will reflect that - which will drive the fuel trim up - first the short fuel trim and then the long fuel trim. That's about the best I can do with what I see here.
@@McCuistian ok thank you for responding so quickly. Is the pcm reset the same thing as resetting the fuel trims? I did a reset of the fuel trims after I did the cam sensor but the code still returned. I will try to smoke the intake again I was thinking that the leak is so small that it may only present itself under certain conditions maybe only when engine is at operating temp? I will do the pcm reset and move forward from there. How long should you hold the terminals together when you do a caps discharge? Do you have any videos talking about cap discharges and what they do? I have just had bad luck doing them in the past with new issues popping up after they are done and of course the technician is always responsible. Is resetting the adaptive values the same as doing a pcm reset?
@@billsfan1768 You just touch them together briefly - it's important after you do this to watch fuel trims at closed loop to get an idea of how serious the problem is - also watch O2 sensors.
Great presentation. Always like the test questions with the explanation afterwards 😀 When you say a late ignition timing causes a low vacuum do you mean valve timing? The word ignition confuses me. Thanks sir 👍
![ASE Test Prep - [PASS] the L1 Advanced Engine Performance](http://i.ytimg.com/vi/rXjExW8YEJA/mqdefault.jpg)
![ASE Test Prep - [PASS] the L1 Advanced Engine Performance](/img/tr.png)
Thank you for making this video. It helped me ace the A8R Engine Performance ASE Test yesterday. This was only the third time I've aced an ASE test since 1979.
Thanks for such a great video.
Please make more like this for all ASE tests.
May God bless you and your loved ones.
All your videos are very informative. Thank you for putting out videos of what it’s like to sit in a automotive lecture. Reminds me of being back in college and has really helped me prepare for ASE tests!!!
Thanks Bill!
I'm a DIYer but still enjoy testing my knowledge !Thank you for the video !
I have watched many of your videos and I have always gained some great knowledge from them, so thank you for your help along the way!
Thanks you! Great job. I’m studying for my L1 and this was a very good overview of engine performance
Thank you very much. Really learning from your TH-cam videos. God bless you.
Thank you sir
Thanks Sir, for another great video. And I wish you, a happy new year. 🇵🇹
Happy New year to you too
I think I figured out why you have so few subscribers,the name of the channel is the problem.I think you need to rename the channel to Automotive something and you will get a lot more subscribers!I'm lucky to have stumbled upon your channel.Your a great teacher people need to find you !
Great video! Thank you Sir
"....What's the answer to number two...?"
Hi I am having a problem with a car and I am really hoping you can help me. I have a 2011 Chevy Cruze 1.4l turbo. The codes I have been getting are a p0341 cps range performance and a p0171 fuel trim system lean. Another shop changed the intake gaskets, the injector o-rings and the purge valve and were unsuccessful so now it is here. Upon driving it I noticed the codes would come up as pending and go away before they would set as a hard code which I thought was weird. Wile I was looking at the intake side and testing that cam sensor while it was running I noticed it was vibrating like something was hitting it. I took the valve cover off and noticed the reluctor ring was coming into contact with the sensor putting a grove in it. The guy next to me suggests to bend it straight. We managed to do that without braking it but when I started it up it seemed to be running a little rough. I drive the car home for the night to see if the code re appears. Just the p0171 code comes back. The freeze frame data is as follows distance since first malfunction 15mi, distance since last malfunction 24mi,
Short term-3
Long term 30
MAF 2.85gps
IAT 78.8F
HO2S1 .77V
HO2S2 .77V
TPS 14.4
Ambient temperature 39F
BARO pressure 99.0kpa
My thinking is the reluctor ring being bent is causing the sensor to read improperly causing these issues. I think that is my best guess because that is the only part I found to be defective. Is am hoping you can help me!!! Know one at my shop is a master tech and I am the best shot this car has. I am tired of driving it to set all the monitors lol I am thinking it is this but the job is very labor intensive and before I do the job on Monday I was hoping you can read this post and give me some advice. Thank you for your time and have a nice day!!!!
I believe you've fixed the Cam Sensor issue by straightening the bent reluctor.
But From the fuel trim readings you're getting on the Freeze Frame (+30 LFT) it seems that you still have a lean condition - I see 14.4 TPS, but no engine load or vehicle speed. Typically that engine should, at idle, be showing something like 1.4 grams per sec, depending on prevailing barometric pressure.
If the MAF is skewed a bit (and it's impossible to tell by that Freeze Frame Data), it can cause that lean condition; I'd be interested in knowing what the fuel trim readings do if you do a total PCM reset - remove the battery terminals and touch the cables together - then let it start over.
If you still have a lean condition driving the fuel trims rich, it'll show up first in the Short Fuel Trim readings as soon as it closes loop and then the long term fuel trims will follow until the short fuel trims return to zero - I'd be using a smoke machine to check for air leaks in and around the intake, injectors, etc.
But again, if the MAF reading is skewed to under-report airflow or report a higher altitude in the BARO reading than is accurate, the commanded injector pulse width will be too low and the O2 sensors will reflect that - which will drive the fuel trim up - first the short fuel trim and then the long fuel trim.
That's about the best I can do with what I see here.
@@McCuistian ok thank you for responding so quickly. Is the pcm reset the same thing as resetting the fuel trims? I did a reset of the fuel trims after I did the cam sensor but the code still returned. I will try to smoke the intake again I was thinking that the leak is so small that it may only present itself under certain conditions maybe only when engine is at operating temp? I will do the pcm reset and move forward from there. How long should you hold the terminals together when you do a caps discharge? Do you have any videos talking about cap discharges and what they do? I have just had bad luck doing them in the past with new issues popping up after they are done and of course the technician is always responsible. Is resetting the adaptive values the same as doing a pcm reset?
@@billsfan1768 You just touch them together briefly - it's important after you do this to watch fuel trims at closed loop to get an idea of how serious the problem is - also watch O2 sensors.
Great presentation. Always like the test questions with the explanation afterwards 😀 When you say a late ignition timing causes a low vacuum do you mean valve timing? The word ignition confuses me. Thanks sir 👍
Both late ignition timing and late valve timing can cause low engine vacuum. 😁
Can you explain how a lean air/fuel ratio burns hot and fast? Is it because if the 02 sensors are reporting more oxygen they start adding more fuel?
Think of how coals in a grill or fireplace burn hot when you blow air on them - same basic principle.