In this video Miss Marie has a look at a Chevy Sonic that comes in with the engine light on and has a lean code stored in it. This is her first diagnosis she has attempted and is an ambitious learner! Be sure to check out Mike over at NGK to learn more about Fuel Trims and up your game when it comes to lean and rich codes. -Enjoy!
Fuel Trims—Testing & Diagnosing Rich and Lean Conditions (P0171, P0172, P0174, P0175): https://www.youtube.com/watch?v=BlcWBZ-iaTY
Fuel Trims—Testing & Diagnosing Rich and Lean Conditions (P0171, P0172, P0174, P0175): https://www.youtube.com/watch?v=BlcWBZ-iaTY
I like your time
I like to work with you
same problem in my car P0171 but the dealer said it is my turbo but it seems i dont believe in now i watch a lot youtube about lean but nobody said the turbo is the cause thank you
We didn’t understand what was the problem, what part you need to change to fix that??
Another one to note before confirming fuel trim data is if the fuel trim is in closed loop. Great info guys
Learn by doing is exactly right. I'm 3 times your age and still just learning about these codes and 'puter gizmos on my cars.
eric hi i think its regulator diaphragm and not pcv valve tell me if i correct
excellent video Marie. Great job and thanks for sharing!
guru on the scan tool. great work Marie.
Definitely a SOLID joke 👍
seems like minded is doing the same thing but has not trip the engine light on so I can put my scanner in her. 170.00 for a valve cover from the dealer grrrr
Awesome video, thanks!
Miss Marie,
I am very impressed. It appears that you retain what you learn and can apply it to the diagnosis at hand. Keep up the good work.
Pvc valve stake open
The young woman is very fortunate to have an honest and good teacher of diagnostics.
Stoichiometry, and y'all didn't think you would use chemistry after high school.
What if I changed my freshair intake hose and it still shows me the check engine light on?
good job guys
Hey I have a 13 Sonic lt with the same code, I had it come up last week and it shut back off, now it came on again. Any thoughts on what that may be?
Good Job… Lots of info on the Echo Tech. I have one in my Wave.
Love when you work with Marie. I learn along with her. Great video
Hate this code
Can someone explain why the engine stalled when the dipstick was removed? I understand what the PCV does and how this failed valve is causing negative pressure in the crankcase, but why does relieving that pressure cause a stall? Is there a sudden additional inrush of (unmetered) air and the ECU just can’t change the fuel trims fast enough so the mixture becomes so lean that it won’t ignite?
Dealing with that stupid code right now on my 2014 Sonic LT.
Would powertrain warranty cover this?
What scan tool are you using. I like how the fuel trim numbers are presented.
Thank you Marie and Eric. My 2012 Chevy Malibu was showing few vac leaks. Just replace my oil filler cap on my engine. Learn a few things from the video.
This sucks, I'm out of here.
Classic locked hood technology. PCV valve built into the valve cover. The Diaphragm is torn
Young lady is smarter than most YT mechanics
Not to be overly nitpicky, but when you rev up the engine under no load, the reason the fuel trims improve when there is a vacuum leak is because the overall airflow into the engine increases while the amount of air getting in through a vacuum leak stays roughly the same, therefore the fuel trims improve because the vacuum leak is causing a lower percentage of error in the MAFS reading. For example, lets say you have a vacuum leak that is allowing 1 g/s of unmetered air in on a 2.0L engine at 20 inHg, where we might expect to see 2 g/s of airflow through the MAFS under normal conditions, the vacuum leak will be causing a 50% error in the MAFS reading, so we might expect to see total fuel trims around 50%. If we increase the engine speed off idle to 3000rpm, we may see the airflow through the MAFS increase the 5 g/s under normal conditions, but because the manifold vacuum is not significantly changed by revving the engine under no load (I'd expect almost no change once the engine speed levels off, it may even increase manifold vacuum due to the higher engine speed) the vacuum leak will still only be allowing in about 1 g/s of air. So, that 1 g/s of air caused a 50% error in the MAFS at idle when the engine is ingesting 2 g/s of air, but its only a 20% error when at 3000rpm under no load when the engine is ingesting 5 g/s of air, so the total fuel trims should improve to around 20%.
Great job with the video and teaching a new tech how to properly diagnose a car.
Nice job Miss Marie. I hope you are doing well and still working on cars. Waiting for the MMA (Miss Marie Auto) channel!
It would be cool if you can do a timing belt change on one of these bad boys
Dangg why does gm or anything change a simple tool or part that did just fine with a pcv valve outside on the valve cover that pops in and u just change that when they fail instead of this crap built in . All this is , is a money racket bs they always gotta do something. 🤦♂️🙄 gezzz just dumb engineering
Way to go miss marie its awesome to see the younger generation learning to work on vehicles
great job!
▄▀▄▀▄▀▄▀▄█▓▒░ Great job. Keep it going, You will gain an enormous amount of knownedge from youtube Good & Bad, It's knowing which is which that is key. You have a thirst for knowledge, and Eric has it all to share, as long as you have the hunger to learn, Eric will keep you on the right track…… Thank You.░▒▓█▄▀▄▀▄▀▄▀▄▀
Great job, Ms. Marie!! I'm so glad to see young people interested in the automotive service field! And thanks for letting us follow along!!
Well done Marie, keep up the great work 🙂
miss maries well on her way to her own channel……!
Who can give dislike😠😠
Great Video!
Awesome job!
The most modest and mature mechanics I've ever seen lol. They would not like me 😂
Great job guys!
Un metered air term I'm familiar with.
My concern locking at the initial live data was the coolant temp. She said it was okay but it was only 109F. How long had it been running? Did it ever warm up to operating temp? I would of preferred to let it warm up fully before looking at the fuel numbers.
Wish I had a smoke machine back in the late 80's and early 90's. Would of made things so much easier.
Something wrong with video. Keeps freezing. Other YT video playing fine.