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Subscribed!!

There are multiple eccentrics per shaft correct?

There needs to be more likes and comments here. GREAT case study. This is 2024 right now. Hope to see you at Vision in 2025.

nice...👍🏾👍🏾👍🏾

How does ethanol affect ECM/PCM fuel trim calculations? Does it require the same 14.7 ratio calculations or some other ratio? If so does the ECM/PCM sense whether the fuel is ethanol or gasoline and use a different ratio for ethanol? If the ECM/PCM assume gasoline is used and does not adjust for the use of ethanol what is the impact on air/fuel calculations and fuel trim outputs? How does this affect scanner outputs, rich, lean, etc.? Is there a YT video that addresses these questions? Bottomline: How does the ECM/PCM adjust for these two different fuel types with different optimum air/fuel ratios, or does it not, and what are the impacts on scanner readings and diagnosis? Again, is there a YT video that addresses these questions?

All this waveform analysis is nice and all, but a vacuum gauge and back pressure gauge could have done the job. Volumetric efficiency testing too. Perhaps measuring inlet and outlet temperature of the catalytic converters?

How expensive a scanner is needed for this level analysis?

Techs shd make 100k +

Whew. Just go to med school !

It shouldn't reach 5psi of back pressure at full throttle.

Fantastic educational video.

Great video. The biggest problem I have ran into were ignorant employers that accused me of wasting time when reading diagrams.

Fuel trims sometimes are not accurate, meaning not real, caused by defective or aftermarket or dirty or old OEM MAP or MAF sensors, like mine, the MAP sensor, which causes both fuel trims to be at 12 to 14 percent. I thought that I had a vacuum leak, but it was the aftermarket Delphi MAP sensor reporting wrong air flow or air pressure to the ECM, I just put back the OEM sensor and the fuel trim went down to 5 percent. I couldn't believe it, almost 10 percent extra, unnecessary fuel was injected into the cylinder, I don't know why oxygen sensors didn't report rich condition? And now I installed new OEM honda Denso bought from eBay, and the fuel trim went to zero percent now, sometimes 1 percent, sometime minus 1 percent sometimes 2 percent. I couldn't believe it. The initial issue was rough idle and sometimes engine misfire, and fibration, but it was the ignition electric connection wires that were loose at the aftermarket start button system. Basically, I created the problem over time by using a bad quick disconnect connector. I replaced the connector, and the problem partially solved: rough idle and misfire, but the fuel trim problem got fixed by installing the old OEM MAP sensor back.

Good explanation! One of the best I’ve ever heard

Hello i just got Check engine light and in diagnostic system said P30EF INTERNAL RESISTANCE. whats wrong?? infiniti Q50S Hybrid can some1 help me?

Your display resolution is terrible why di you feel onligated to sho your upper bidy in the video that criwds the image of the wave form screen

Bloody interesant, 😮😮😮

Great video.! Very informative. Thanks again..!

I had one of these, it was kinda fun to figure out, it was cool to see it diagnosed differently

Dropping the drivers side exhaust should have been all you had to do to determine the problem!

What's the difference between the PCM operating in closed loop with a fault vs open loop? If it's no longer listening/responding to the O2's input and just using stored values, isn't that just open loop?

So what is a p17?

Shit that’s easy, anybody that doesn’t know that should not be a mechanic,,,,,,,,,,lmfao shit man this is complicated. Big thumbs up and new sub here.

Very educative, pray to see more on troubleshooting modern electronic vehicles, including hybrids.

2008 Ford ranger V6 vulcan engine . LTFT Bank 1 was running negative -.8 at idle , would not change. LTFT on Bank 2 at idle was 9 percent. Drive down the highway both long term fuel trims were within acceptable limits, but press more on gas pedal #1 LTFT got more negative and # 2 LTFT got more positive. Checking the number 1 catalytic converter oxygen sensor B1S2 with the truck fully warmed up , it was found the sensor was exactly duplicating the upstream sensor, switching from .2 to .8 volts. Number 1 catalytic converter was obviously no good and partially obstructed as well.

Glorified nissan designed to break

Sounds like you way over complicated this

Iv got same car and it was on front accident steering airbag popped the car can't start meaning the emergency shut off was activated..how can I solve this?

Good ! Thank you !

I was smiling ear to ear while watching this video. That's how good the diag, info and presentation was. Absolute masterclass!

Excelente class 😊 😊

Why didn't you show a known good transmission so that we can follow your conclusion?

The scan tool is the first thing that should have been hooked up

great video , well presented and much appreciated , thanks

Super beneficial lesson ! I learned lots of new things !! Thanks mate !!!

Watching it again ! This is GOLD !!

Great job John !

The same as Bernie thompson video on Nissan 370z. Great video. Thank you John

John, Another Amazing case study and lesson. Thank you for sharing!!

Great Case study!! Thanks.

increíble

Interesting, thanks so much Mr thornton 👍

Interesting!, Thanks so much

I'm a new Comer to automotive diagnostics and I have to say you are the best teacher or this industry hands down. Thank you.

Best automotive diagnostic lectures and case studies, thank you John Thornton!

Fantastic tutorial ! Thanks !!!

For anyone still reading comments on this video: If the O2 sensors are easy to access, I wonder if it would have been more efficient shop practice just to screw in a pressure gauge and compare the banks this way?

Great video!Thanks for sharing with us!I am wondering if you can share with us what brand of scanning tool did you use?Thanks once again!

Great information here! Thanks for sharing John!

Good for learning electronic controls being old school would been using mechanical gauges vaccum compression and exhaust pressure, oh never assume previous Diagnostic been their more often than needed.old dog learning new ways.