Chevy 2500HD With A Bizarre Running Issue
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- čas přidán 18. 12. 2023
- In this video I have a look at a customers 2001 Chevy 2500HD with the big 6-oh and the customer states it runs very poorly as soon as it warms up. A little bit of time looking at some running data we soon discover a huge problem in the fuel trims and notice the O2 sensors are not working like they should. Sounds easy enough right?
-Enjoy!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained. - Auta a dopravní prostředky
Great diagnostics. Most mechanics would have shot the parts cannon and replaced O2 sensors; of course to no avail. The truck owner should be super appreciative that your superior diagnostic skills have enabled him to continue to enjoy his truck.
Happy Holidays to you and your family.
Eric didn't need to fire the cannon, apparently, someone else did!
Hopefully that rolling wreck wont kill some innocent other driver when it falls apart.
@@dennyoconnor8680 _Hopefully that rolling wreck wont kill some innocent other driver when it falls apart._
As are many I bet in New York and the rust belt. That truck is far from an exception most likely. He isn't an insurance adjuster so as to total a vehicle, which such a vehicle is frequently worked on by South Main. In short, that's no where near a unique case. If you are concerned and live in the rust belt, move.
@@dennyoconnor8680 Hopefully after the owner finds out from this video, they won't be driving that rotting pile for much longer. I know it'd be a wake-up call fer me!
It's not that bad
I design low voltage circuits and sensors for a living, and I'm always impressed by your grasp of electronics. You nailed this diagnosis and did a great job explaining it
Fake it till ya make it is what I do
So you gonna redesign the "weather tight" connectors 🤣🤣
Sight unseen I would bet and take a chance to his getting it designed! He speaks like an electrical engineering Career person!
I was an old computer technician from the late 1960s, so no more pull up/ pull down resistors to eliminate floating electrical signals?
@@SouthMainAuto No, this one was a masterclass. Thanks for taking the time to explain. I for one learned something new today. Excellent.
Thank you Mr Eric O for inviting me into your shop! I never mind the sound of the furnace, compressor, telephone, and Josh working- oh and your neighbor cutting his grass (he must be scalping it). In my opinion that’s what makes this shop/ channel so great!
Don't forget the "Hey it's that guy" guy.
Don't forget the lunch time siren
I don't either. It's part of shop life. I lived it for most of my life.
The excitement in Eric’s voice when he discovers the thats your problem lady is worth the video itself!
I’m a retired Boeing electronic engineer. You have explained it extremely well, you’re really great at this! I’ve learned a lot from you. Thanks buddy!
Lol
Hmmmm….. I see some other CZcamsrs that poke holes all the time. Great stuff as always!
@@flightforensics4523happy holidays fellow Charlestonian!
"If I'm wrong, we'll delete the video and pretend it never happened." Made me chuckle out loud.
You are not only a top-notch wrench, Mr. O., you are a great story-teller. Your kids are fortunate.
Had a 6.0 2500 GMC truck where the engine would run fine in open loop but when it went to closed loop would lean out all bank 2 cylinders. What was happening was the ac drain was dripping water onto the B2 S1 sensor connector, shorting the 12v heater ckt to the sensor signal circuit, creating a false rich exhaust condition. The ECM would try to lean it out by reducing injector pulse width to the point all 4 cylinders would misfire.
There ya go. That's a good one!
thats factory,,isnt it.. why i dont buy modern ve hicles.. too much sht..
Good diagnostic skills on your part. I hope that you got paid for your knowledge.
1 hour to replace the o2 sensor and grease the connector/ check terminal corrosion plus diag. About 40 bucks.@@larryberry2436
Great diagnostic strategy, Eric! That problem could send many heads on a wild goose chase.
I’m impressed, both by the bravery it took to stand under that truck, and also by chasing a weird voltage reading on the scan tool down to a pinhole in wire insulation and salt. I had no idea that those circuits were that touchy.
I always love your explanations of things. It's always detailed and very thorough. While I'm not a day to day mechanic, your wisdom helps me better understand how things work under the hood, and I love it. Thank you for your service to the community.
Another brilliant diagnosis from the South Main Sherlock Ohms
"You gotta know a guy to get a sticker for one of these babies!" There's a quote in every video.
"Oh, look. There's a new sticker."
Great line!!
I’ve worked on MRI systems for 39 years. Analog to Digital circuits are genuinely complex. The A/D converter doesn’t care that much about current. (Caveat: it does, but only to develop a voltage). Nano-amps of current when run through an RF filter and fed to an A/D converter will happily work just fine, and provide a digital representation of the voltage it senses. The same goes for a modern day DC digital voltmeter.
So just the salt deposit on both insulators acted as a very high input impedance short, and some tiny value of current flow was established. Maybe in the nano-amp range. The ECM A/D converter happily did the conversion and sent it to the digital computer side of the ECM and BOOM, the O2 sensor had an offset.
In other words, you nailed it, Mr. O! Perfect description and understanding of parasitic current flow on the outside of an insulator. Nicely done, and outstanding troubleshooting. And if you prick a wire, always seal it up with liquid electrical tape! Thanks, Mr. O!!
What you just said is true, however, Mr. O thoroughly comprehends all of this interaction between electrical; digital and "the real physical world" . (water; salt; dirt & etc.). These things are not taken into consideration by the "engineers" when they design their equipment. And the interesting fact that Mr. O isn't aware of just how "gifted he truly is" !!!🤔
Great analysis as usual. That would have been the greatest challenge for any mechanic/technician/ problem solver and you zeroed right on it. That’s why your the best on CZcams. I doubt any of the others would have picked that up, especially the ones in warmer states.
I live in North Carolina and I am glad to have Eric's videos because many Yankees are relocating here with their rusted out Subaru's.
It wouldn't happen in warmer states, they don't salt their roads.
@@briangreen430no self respectin’ northerner drives a Subaru 😅
No way anybody would have found that. Your a frigging genius.
Happy Tuesday to you and yours! A 2001 Chevy pickup is a rarity these days in your part of the country, isn't it? You're probably the best diagnostic guy I've ever seen. Keep fighting the good fight Eric O.!
Looks like the only thing keeping it on the road is the shady safety inspection .
It didn’t look all that bad. Frame seemed fully intact and rocker panels were in place. Just the usual crust…
@@tylermacconnell217POS lol
@@tylermacconnell217 those rockers are covered by Bushwacker covers. I'll bet they're dust/nothing behind them.
@@SuperSecretSquirellYou caught that as well.
Remember kids if you are doing the hokey pokey always remember protection, or someone is going to get salty, you'll have someone scoping your undercarriage and get a huge bill.
Per an old saying, “You Do the Hokey Pokey and You Turn Yourself Around, That’s What It’s All About!”
Amen!
Unless you want beautiful babies. ‘Protection’ is a population control method used by the controllers.😜
35:03 😅
😂
Super smart diagnosing. This is why you get the big bucks.😊
You Mr O are the Sherlock Holmes of diagnostics! Simply amazing. Great job!
Sherlock Ohms
@@mrfishbulb7187 😆 lol good catch
I hope he doesn't replace, "There's your problem lady! " with "Elementary my dear Mrs. O."
Understanding the sensitivity of the miliamp/volt circuitry can really help zero in on diagnostics.
Knowing your influencial environment like salt corrosion whether from winter road maintenance or ocean is huge in terms of where to look for potential trouble spots.
Here in Hawaii, electrical connections full of corrosion go unnoticed because there isn't a bunch of green puss around the connection, but that light oily salt film is actually everywhere.
I would imagine even there in New York or any seaboard location.
I live at 4,600ft elevation, but here in the middle of the Pacific ocean, there is nowhere that you don't have salt air.
Excellent catch Eric, perhaps you have worked in a salty environment before.😂
It amazes me how such a slight oily film can affect the sensitivity of electronics.🤙
THAT was one of those 'who'd a thunk it' type of deals.
Great job on the diag!!!
Got to love that salt's conductivity. I once had a customer with a 54' Bertram powered by12V92TA Detroits call me one morning that said one of his engines just started up by itself at the marina in the middle of the night. Went and checked it out, and a pinhole had developed in the a/c condenser water manifold (uses raw water for cooling) that was outboard the port engine. A fine stream of salt water had misted the starter solenoid and lit the engine off. Had to rebuild the starter. Definitely strange, but not hard to find why.
Good story
You just saved the earth and unbelievable amount of oxygen sensors and ECMs! A single dealership would have shot their parts cannon at this truck so many times it would have caused a national backorder. Seriously good diagnosis Eric!
you saw a strange reading on the scan tool and didnt ignore it. you took the time to double check what you thought was supposed to be the correct reading and redirected your route before calling a bad sensor. that never give up approach to your diagnosis process is what makes you a great technician. cant wait for part 2. maybe bonus footage of fixing the manifold leak. I wirs you and your family a Happy and Safe Holiday.
A Great Master Mechanic is Always Great to Find. Your Viewers are Spoiled. You’re the LockPickingLawyer of Auto Mechanics. Great job, Eric O. 👍🙏
You Sir are a Wizard! Thank You from a tail end boomer who is also trying to scratch a living in Upstate NY. My FI knowledge has improved tremendously from nothing due to yours and a select few others vids. You are also a great teacher, and I wish you and family all the best.
"for some reason I doubted mysefl" And this is why your argueably one of the greatest mechanics that ever lived ❤❤
Thank you so much for sharing this experience diagnosis I would never believe that if I didn't see it 😅😅 you make it seems like it was so easy to diagnose and yet so many of us would be scratching our head with this issues 😅
Amazing troubleshooting, Mr. O. Gotta admit, this well seasoned electronics technician is impressed with your skill and determination. I've seen high voltage (several thousand volts) find some odd pathways across non-conductors but never anything with voltages this low. With HV, there's always the possibility of carbon tracks created as a result of arcing across contaminated insulators creating a high resistance pathway from point a to point b. How (presumably) vinyl insulation can become conductive like this is new to me. Bravo!
Man, when I watch videos of the corrosion underneath these trucks, I know I’m SOOO spoiled in California…. But even so, I probably still wouldn’t have figured this one out! Awesome diagnostic skills Eric!!
The salt in water finds its way up both the outside insulator and inside on the conductor and the insulator. Once it dries, you got power from the heater side through the corrosion and into the sensor circuit. WOW! Try explaining that to the customer!
Good one Mr. O.
You don't haha you just tell them the total lol
@@SouthMainAuto😂
Wait til the customer gets a bill for more than the value of the vehicle.
I have a 2009 Chevy Aveo with a r-title thanks to a deer. Just put about 1k into shocks struts a bearing 2 lower control arms 2 rear bushings 2 interior door handles rear brake shoes and an alignment
That was interesting as hell. You are one smart tech I would have never figured that out. Nicely done
I think you nailed it. The salt itself is conducting, and is more than happy to reach the conductors thru any pinhole or other means available. Super bad environment up there in PRNY. If a good O2 sensor has a comparatively low impedance to the input of the ECM, having it unplugged (or a bad connection to it) would leave only the path thru the contaminants to determine the voltage - whereas when the O2 sensor is in the circuit, it would mainly be the determining factor. But what do I know? I'm a plumbah, for cryin' out loud!
Eric, your ability to explain a problem and diagnose it, and why it occurred, explains why others brings their vehicles to you to troubleshoot.
You demonstrate a working knowledge about how circuits work, thereby knowing the possible cause and what to look for.
You'd be an excellent teacher at a tech school or jr. College.
This reminds me of some things my dad always taught me about electricity, I guess whats happening is some galvanic cell formation due to the salt and corrosion which its reaction is accelerated by you when touching both wires at the same time maybe like how a battery works.
Always good to see Mr. O on a Tuesday
He shot this on a Monday , I held the camera
Good find. That`s another reason to shy away from cars that have had too many hands stirring the pot. You can`t tell those guys that they`re doing bad by stabbing wires at random. They won`t listen.
You have no idea how mad I get finding holes punched in the wiring harness! I've had to replace the complete harness on a 2 year old Mack rolloff truck because of one person was punching the wires every couple of feet.
Great Job t.shooting this! I worked in mobile and marine electronics for many years (years ago) and found the most interesting problems were with discreet corrosion problems like this. This particular one would have likely had me stumped for a bit longer than Eric I think. Well done Sir!
Fantastic as always, Eric. Merry Christmas!
I love your diagnostic videos. Been watching for years, well done as usual.
Very nice to follow your journey! Enjoyed getting to the bottom of the issue !
I had this happen to me years ago; we don't have much salt around where I live. I like you said this truck will never pass inspection. OH! there is a brand new inspection sticker. Not bad for someone that has never had any training. You are a good man, Eric. GREAT VIDEO!
I've always appreciated that you take the time to explain the issue. And your findings.
Therein lies a classic demonstration of the differences between knowing what components individually do, and how systems work. The devil truly is in the details...
Great find Mr. O! Looking forward to Part II!
You’re sharp as usual, really great troubleshooting skills!
Wow, crazy find! Excellent diag, Thanks for sharing!
Great one! I have not seen this before. Thank you!
Very interesting diagnosis. I would never have thought to check that.
Always a banger mr o. Merry Christmas to you and the family.
Physically I've been out of the business for a decade mentally not so much.
I have to say you really are amazing.
I have put a word into a small extended warranty company that if you ever call just pay what ever you say needs to be done. ( pretty sure you won't as it on the other side of the U.S. but yea ).
Thanks for taking us along only wonder what your start to real end time is on the diagnosis...
Merry Christmas to you, your family, friends, and anyone who reads this weither it be today, tomorrow, next week or next year as there will always be another one.
Thank you for the recap at the end. Great job as always!
These videos always keep me on the edge of my seat. Frigggin love it! Keep up the good work!!!
Merry Christmas to you and yours.
i really liked this video. my brother-in-laws father was an auto electrician before graphing meters and all the heavy duty diagnostic tools. i remember he had the ability to feel the wire and find where it was broken internally. when you moved your finger over that wire and the voltage went wacky it brought back memories. i am 71 years old and i have not seen this skill many times in my life. i learned a hell of a lot from this video . thanks!
Wow, I would not have expected that. Crazy. Great job at troubleshooting!
Thank you for your videos. Been learning from you for over 3 years, cant wait to learn more.
Liquid tape and / or marine heat shrink (with glue) needs to be applied to any and all holes poked in vehicle wiring to reduce chance of wire corrosion and circuit malfunction!
Thanks for the videos!
Very helpful videos that you show!
you are really good at explaining electrical stuff. thanks so much. always enjoy your videos.
Shout out to those original O2 sensors. Putting in the work. Thanks for pointing this out. Excellent diagnostics as usual
Another Great video Mr O Thanks for sharing.
Thanks Eric, learn something new every time I watch your channel.
Great information. It's a pleasure to see a master at his job
Happy Holidays to you Eric and family.
very informative. Appreciate your old school diagnosis methods and troubleshooting. It is a lost art now a days. Cheers !
Man this was an interesting one, thanks for sharing with us. Waiting to see the repair!!
This was such a great video Eric, super helpful.
Well this answered a lot of questions I have run into many times..... Thanks for sharing Mr O.
Your patience is golden. Good Job.
Awsome job and explanation! Thank you.
Amazing work, thank you for sharing with us
Eric, Another great job & diagnosis!
Mr O, you are a gem of a person and you just saved me a whole lot of trouble fixing this exact problem on my Chebby plow truck. I'll learn proper diagnostics by spring, but this got me up n running for snow season. God bless you and merry Christmas to the family!
Bravo. You are a master mechanic, Eric.
Great one Eric..and your troubleshooting skills are killer!!..happy holidays to you and yours .I am so looking forward to 2024 with SMA.
Great diagnostics on your part. I have a 2004 suburban with a similar problem on bank 1 sensor 1. You have given me some insight on what to look for and it didn't cost me anything except a like. Thanks!
Cool example. You really are a gifted teacher.
This was a super-interesting diagnosis! Thanks for taking us along and 'splaining it all so clearly. Merry Christmas to you and your family!
Thanks for all the videos Eric. Merry Christmas and Happy New Year to you and Mrs. O and all the kids.
Great video! Thank you for taking the time to record this
You sir are a true master of your craft. Can't tell you how much valuable knowledge you've passed on to all of us
Diagnosing the stray voltage is a great job. Most people would have overlooked it. I had a similiar situation. I did ignore a situation until the fellow I was working with said that this was what he was looking for. When diagnosing a a situation, I learned that you should NEVER ignore something that seems to be unusual!!
Another fine diagnosis! I always learn stuff when I'm fixing things.And i fix everything. Now, I'm picking up information on my downtime as well. Great show!
Great observation of the bias voltages on both O2 sensor circuits. Thank you for taking the time to explain circuit operation and diagnostic process!
brilliant diagnosis from the South Main
Great diagnostic skills! Great videography! Great explanations! Wish there was a skilled technician like yourself near me!
I love watching this channel i always learn little tips.
What a great find. You are a master mechanic. You never bust out the parts cannon!
Hi, Mr. O. I love your detective work. Thanks for sharing! Stay Healthy!
Thanks for another great video - a really interesting one.
Eric your troubleshooting skills are amazing on those CHEEEVERLAYS!
Another amazing diag Eric. The way you find pus packs and broken wires is truly amazing. From my Family to Yours, Merry Christmas.🙏❤🌲
Wow! That kinda blew my mind. Didn't think a short like that was a thing. Thanks for the video! To be clear the ECU sends a bias voltage through those wires so it can check for problems in the circuit. The bias voltage from the heater wire was traveling through salt , and debris outside the wire's insulation and into the pin hole. What a mind F*. I hope you do a follow up video on this one.
Very good, quick, easy to follow diagnosis. I know and appreciate that there are some super smart people in the comments section, but some of the questions and comments I have seen in the past make me question if some people should maybe not touch anything on their cars and hopefully, they aren't mechanics getting paid. But as always Eric does a great job!
I bet if you were one of the first videos on CZcams the world would be a better place today. Thank you for what you do.
Another fine job of diagnosing and leading us through the method. If you dont post another video soon, you and the family have a great Christmas!
you the Man !! I worked on the bench '72-'91 , love your line if thinking things through ! went farming !
The problem was the endemic "NewYorkSemiconductor", salt, dirt and some come and go H2O. PITA!!! In my pre-retirement days, I maintained a lot of low voltage, PLC input control panels. Spill one nice, sugary soda over the panel, it runs into the switches. NOW, find all of the sugary shorts.... Good Job/Great Video, as ever. Those type of problems pretty much disappeared when we went to touch screen panels to replace all of those wires and switches. Michael in Colorado.
great find Eric that is beyond bizarre!