Chevy Trailblazer: Will Not Run A Drive Cycle

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In this video I have a look at a customers Chevy Trailblazer EXT with the big 5.3 that has a customer complaint that the vehicle will not run a drive cycle. I give you a small list of items that will inhibit the drive cycle and we find the issue right off the get go. However a Napa part throws us a red herring.
-Enjoy!
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15 июл 2024

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Комментарии : 737

@onemechca Год назад

Brilliant diagnosis Eric....aren't you tired of aftermarket companies producing junk that can cause you to go down rabbit holes like in this case?? Thank goodness you have the experience , service info and gut instinct to know what is right...keep up the video's bud.

@pootthatbak2578 Год назад

Dont think of it as junk, but inexpensive stuff that couldnt pass a strict quality control test

@jblyon2 Год назад

@@pootthatbak2578 That's business 101. If too many of your products can't pass quality control, just get rid of quality control. Problem fixed!

@stevewesley8187 Год назад

@@pootthatbak2578 not always so inexpensive........

@michaelgiannone2192 Год назад

I’ve learned. Anything electronic buy OEM

@pootthatbak2578 Год назад

@@jblyon2 no..the problem is, before chevy or toyota or whatever oem seller buys the same parts from a manufacturer..could be the same part NAPA or standard sells, the part will get QC tested. The testor passes the parts that are closest to oem spec. Then the rest go to the " undersellers, or acme cheap discount auto parts inc

@steveb6103 Год назад

You've said it so many times. " Just because it's new doesn't mean it's good"

@rationalguy2744 Год назад

I prefer used parts because they have been tested.

@frankvucolo6249 Год назад

When you put that calibrated resistance tool on the circuit and got the proper expected feedback from the pcm, I said “dang, that’s cooler than the other side of the pillow!” You never stop learning me stuff, Mr O!

@COBRO98 7 месяцев назад

A potentiometer! Very useful in automotive work. He used that to rule out a fault on the PCM side

@wyattoneable Год назад

I enjoy hearing you think out loud to your approach to these challenges.

@Dee12327 Год назад

Eric is a very humble person, he always says he’s not very good at the software side of things, yet he shows very detailed videos like this one that goes in to depth on how he came up with his findings. Ive learned a lot from this channel, and always look forward to new videos!

@clintprice2123 Год назад

What a great way to start the day, a new South Main Auto video!

@Robalo-2660 Год назад

Eric, you have taught me so much over the years. I would replace a part and call it good. You have shown me the way of a true master. Trust but verify. I am so grateful for the time and effort that it takes you to produce a video and share your knowledge. Much love my brother, you inspire!

@mrkttrdr2919 Год назад

one of the best vids u have done, because it goes to the heart of not overlooking a simple sensor that could be junk even if its new, great work as always, thanks for posting

@SouthMainAuto Год назад

Thanks 👍

@typingnow1742 Год назад

I just had to post that I think this guy is the most brilliant car mechanic on RU-vid. I’m not joking, I’m in awe every time I watch one of his videos. Guys like him are rare, it’s like a natural intelligence. An unusual ability to understand and manage complex problems. I feel like such a mental midget watching this guy. He ends with “If I can do it, you can do it” but that’s simply not true. The only time he ever lies in his videos.

@arniebriscoe2978 Год назад

Eric, we'll say 40 years ago, I built a very strong 454 for a hot shot driver in his 78 one ton Chevrolet. Put a new standard temp sensor on and anytime he got over 60 mph and turned the a/c on the temp would climb to 230 degrees. It was using a quart of oil every 500 miles Pulled it apart, took l out the chrome molly ring and went back with steel rings trying to dry up the oil usage. Still overheated. Finally put a thermometer in the radiator, showing @ 160 and the gauge at 210. It would not get hot enough to seat the rings. Put the old senor back on, temp got right and got the engine hot enough to seat the rings. no telling how many hours and money lost trying to figure out it was just a new bad sensor. I feel your pain.

@warbirdwf Год назад

I just wanted to say two things. 1) I'm sure I speak for others in saying thanks for all the hard work you do in making these excellent videos. 2) I hope you're making a very nice income from RU-vid for all this hard work!

@JackdeDuCoeur Год назад

I like the way you incorporate lunch into diagnostics. Nice work

@vanceblosser2155 Год назад

I always learn something watching your videos. I was in IT for over 30 years, jack of all trades doing Cobol programming, newer languages, interfacing PCs and Mainframes, and PC repair. Your logical approach is the same as is used in repairing PCs OR in finding a bug in a program and I'm always impressed with your clarity of thought. Keep up the good work and I wish you continuing success!

@MrSahdaddy Год назад

Another fine example of just because the parts is new, doesn't mean it's good!

@Dustin_the_wind 7 дней назад

"The computer is spon on, baby" Well done Mr. "Danger" Powers.

@tinyavenger20playsgames28 Год назад

Seems about right. Cheap chinesium sucks and costs the customer more. Wish i had a mechanic like you here, woulda saved me tons of money. Thank you Mr. O!

@takeahikeforlife Год назад

I read through most of the comments and didn't see anyone suggest this, but being a heating/a/c guy, I would suggest that to be absolutely sure of the internal temp of the sensor, soak it in an insulated cup of crushed ice/water. This would put it at exactly 32 degrees and remove all doubt as to the actual temperature of the sensor.

@billy-sx8wx 9 месяцев назад

Yes but he was trying to confirm it isn’t a wiring or pcm issue.

@rik999 Год назад

The change in resistance vs temperature is logarithmic for those thermistors. That chart you showed has enough data points to plot a log curve so you pick off interpolated values of resistance for any temperature. Also you could make a more versatile dummy thermistor test tool by putting a 100 ohm 10 turn pot in series with the one you already use. Allows for finer adjustment of resistance values. Might be useful for those picky GM drive cycles. By the way, the multi-turn pot I saw you using should be accurate enough so you don't have to confirm all the time with an ohmmeter (saves time).

@stephenbell9257 Год назад

You still need to check the resistance with a meter to get accurate results. With a multi-turn pot you can set the potentiometric resistance ratio very accurately, typically 0.1% error, but when used in rheostat (variable resistance) mode the errors are greater due to the tolerance of the end-to-end resistance, typically 5%. Directly dialling the resistance value could have resulted in an error of up to 5.1%, which wouldn't have been sufficiently accurate for the testing that Eric O was doing.

@markchidester6239 Год назад

I was yelling at Eric to dial in a temp on the chart then test the variable resistor.

@DIYDaveOK Год назад

Fantastic diagnostic approach to use the varistor meter. You'd have made a fantastic software developer! Thanks as always, Eric!!

@mrsargemeister Год назад

I'm convinced Eric could have been a world class doctor or surgeon with his skillset.

@richb.4374 Год назад

Eric claims he is not an electronics guy...yet he has a brilliant understanding of how automotive circuits work.

@SouthMainAuto Год назад

I just get lucky once in a while Rich. I'm not an electronics guy, trust me.

@Yoyo81828 Год назад

As an engineer, Eric could definitely kill it in STEM if he wanted to. Critical thinking skills for days

@kenj.8897 Год назад

@@SouthMainAutojust damn good 👍

@CC-kr2fs Год назад

NAPA=not all parts active. It'll get ya everytime. wel done Mr O

@airborne63 10 месяцев назад

One more reason to use OEM parts......less expensive in the 'long-run'. Delphi used to be owned by GM, so the Delphi parts should be 'compatible'. Another great diagnosis!

@springfield4522 Год назад

Really like how you take us along on the diagnosis trail. Thanks Eric!

@KC-vp7wn Год назад

I ran into a similar issue with my Holly sniper. The temperature reading was off with the sensor that came with the unit. I ended up purchasing a Delphi temperature sensor and that cured my problems. Just to let you know, there are calculators on the web that will give you the exact ohms reading to temperature. Great job and always great videos!

@JOHNSUE28 Год назад

KC. How about a Link?

@KenMrKLC Год назад

How I look to friends and family with a scanner in my hand: Wizard! How I feel with a scanner in my hand after watching an Eric O vid: a 2 year old holding vice grips

@djmartin4776 Год назад

Glad you were able to take us along for that one. You are legendary my guy

@Mike_Engel Год назад

Love you Videos Eric.... Thanks for making them and explaining your methods in troubleshooting

@andrewg6238 Год назад

Wow! You're thought process is so impressive! I love that you share that as well. It is sad that the places that manufacture items that are supposed to fix things make them unreliable, that dang BOB guy! Thanks again for what you are doing and tell Mrs. O. to keep you in line!

@edwardmyers1746 Год назад

I love when both you and Wes post videos at the same time essentially

@tpanther9567 Год назад

Good way to start a Sunday with SMA.

@mark95b77 Год назад

Eric, Outstanding video presentation. Really appreciate how you break things down and insert the small bits of information that give the viewer a extremely clear understanding of the subject matter. Thanks again,

@terryjackson2998 Год назад

As always, a wonderful informative video! Sincerely loved it!

@wk7060 5 месяцев назад

We get value from all of your videos! Thanks.

@jasonbailey6797 Год назад

Great video. Great explanation on the coolant temp sensor and the way it works with the drive cycle.

@richardr2238 Год назад

Love these longer videos. Thanks Eric you made my day !😄 One more thing, so nice not to hear air tools and jack hammers in the backround !

@stationaryenginesworldwide Год назад

Awesome video Eric .I always look forward to your approach on the videos you make .and how you do your investigation.. Truly a master in your field.... Thank you

@timtaylor7106 Год назад

Great tip on the A/F ratio logic,thanks

@mikerobbins5049 Год назад

I am glad there are people out there that understand this stuff so my vehicles can get fixed properly. But I wish there were more like you and my auto tech guy because there are just to many shops out there that should just doing oil changes

@edwardsmith9049 Год назад

Mr Eric o these is a great video. This content was so difficult that I was confused trying to figure what was going own. Until you explained the whole process. Thank you for teaching us. Again great content keep up the great work.

@kenchilton Год назад

Knowing that the coolant temp is a common issue is why you make the big bucks. Thanks for the video!

@CalebTG 10 месяцев назад

Thanks again Eric for a solid and honest repair!

@ronaldbrosius7488 Год назад

Excellent video!! These are the best types of videos. Your very intelligent, and a Excellent mechanic/tech. Your costumers don't know how great they it,having you as their mechanic!!!

@macdonaldsmotorworks Год назад

that little potentiometer that comes in the AES wave connector kit is a go-to for me. I've had a number of situations like this one where new part doesn't solve the problem and I've been left scratching... further emphasizes that a known good, is good! Thanks as always Eric!

@joecnc3341 Год назад

I love to watch your detective approach to solving these types of problems. You do a great job of diagnostics and sleuthing out the problem.

@jorgefernandez-mv8hu Год назад

Very Nice and detailed diag. It is so frustrating when you are headed down the right path, but a bad new part throws you for a loop. Thanks again.

@geordiegixxer Год назад

Excellent diagnosis again. Wished you were over this side of the pond

@AlanFrink Год назад

Another excellent video. Thanks for the diagnostic insights.

@4b131 Год назад

The variable resistor is one of my favorite tools. I don't use mine much but when I need it, it's gold.

@russellbomgardner3817 Год назад

big help for me Thanks Eric . my 06 chevy express 3500 has been giving wacky engine temps for a couple years. I replaced the sensor and still the same. You gave me a lot of great insight and info. I really like watching great diagnostics at work. You da man😉

@jeffreyevens2033 Год назад

Very thorough step by step diagnosis. Nice video, very informative!

@s.j.5850 Год назад

Great video as usual. It would seem that in the race to become a go-to aftermarket supplier they are trying to cover all makes & models, but failing to get each variation of a part to be as good as the OEM. Your logical approach serves you well - keep up the excellent work!

@GTCGreg Год назад

No substitute for proper service data and the experience on how to use that data. Great job, Eric.

@billrimmer5596 Год назад

This is a vid I will flag in my brain. Great thought process. Love any hints on drive cycle. I am always trying to pass cars for inspection. Good to know why and why not.

@markchidester6239 Год назад

Excellent video The variable resistor was awesome These electrical videos are my favorite Looking forward to the engine replacement series. That's my story and I'm sticking to it 👍

@stevew9563 Год назад

Would love to see many more videos on Drive cycle monitors. Your viewers in CA would watch every one! Those are the bane of our existence in our state!! Thanks for the informative Vids!!

@280813jb Год назад

Great diagnosis Eric.

@DanMestayer Год назад

Thanks for the operational principals explained. This troubleshooting the drive cycle will help us home mechanics.

@seastacker8582 Год назад

Great diagnosis, but the biggest thing I learned is how thankful I am to live in a state that doesn’t do vehicle inspections.

@budc2578 Год назад

Just moved to a state that eliminated vehicle safety inspections. At night it’s not uncommon to see 3 or 4 vehicles with faulty headlights or tail lights. Taking a walk thru a parking lot reveals numerous worn tires.

@bazw1685 Год назад

Love these videos of proving that new doesn't mean it's good 🤙 great diag and hopefully another happy customer, all the best 💙

@porkchop4604 Год назад

Eric, you must have attended a lot of Bizzares when you were a kid. When something doesn't respond as it should you always say "bizzare". Another great diag. Always learn a ton. Keep em comin.

@konstantinusstoyanov9749 Год назад

Just listening your science thought process is awesome, thank you

@arnoldviana525 Год назад

Very good video not to long, great diagnostics.

@demetriusbarrett2152 Год назад

I like your videos it shows once again you are the man

@anthonyshriner4362 Год назад

If I didn't live in Alaska, and lived in New York. This guy would be my mechanic for sure

@rogerchevelle8543 Год назад

Awesome Diag and explanatio. Eric O

@ThunderbirdRocket Год назад

Great 👍🏼 work ! I really enjoyed watching / learning how to do this repair .

@joehomanick Год назад

In Philly 2000 an up can have 1 incomplete. You just have to get the evap to go befor the cat . Once the evap is ready it can have codes for the cat but the light can not be on . So a key cycle would turn off the light and try the cat test again . Just have to slip it through then .

@curtw8827 Год назад

Love this channel, no need for paper floor mats.

@danman9017 Год назад

that a good video on diagnostic .this guy has a lot of experience .tks

@rodkennedy9800 Год назад

Keep em coming Mr O. 👍🇺🇦👍🇺🇦

@danielesilvaggi Год назад

Woe!!! you almost hit that guy lol. Dam parts vendors. Great find and video. Thank you Eric.

@josephgallagher3291 Год назад

your diagnostic, and knowledge skills are steller. i repaired heavy equipment and cranes from 1972 to 1996 cat dealer and fed shipyard. the era of NO computers. it was not important to know everything. but your succes depended on knowing where to get information. now that need is 100 fold. and you just hit it out of the park consistantly. kudos!!

@slocavky Год назад

Nice work Eric. Also you took a different way on the big road as you call it.. Nice to see a different part of the scenery around there...

@davidmcclain5180 Год назад

Great information and diagnosis on this one. Great job.

@Todd_S Год назад

I love watching all of the Silverado visits. I have a 2012 Chevrolet Silverado 1500.

@jameslewis1175 Год назад

Hey man u got a lot of respect from me for the monolog at the end about not working for free.

@mikechiodetti4482 Год назад

The coolant temp diagnostics was spot on. A new GM sensor would have shown the difference. The vehicle sitting overnight proved that. I found graphing the cat monitor and watching the digital readout will work. My wife 06 Sorento proved that when I was testing the cat monitor. That one was intermittently working then it would "track" the front B2S1 sensor, continually doing this cycle. Good call on the CTS, unfortunately 2 bad cats will ruin a good day. Good one Mr. O!

@justinlanglais9825 9 месяцев назад

Great job as always Eric ! 👍🏼

@freetolook3727 Год назад

When troubleshooting customers RV appliances, the first question I would ask is "What is it doing or not doing?". Always got a thoughtful concise and informative answer from the customer. They are your best source of info and always know simple facts like "When I turn on the thermostat, nothing happens", even though they don't know the technology behind it.

@joesautorepair9518 24 дня назад

You awesome. Love the videos. Have taught me tons. You are great at everything you do. Thank you

@williamfralick3656 Год назад

Thanks for the knowledge. Never would've looked there.

@wildman9364 Год назад

I had that same problem with my ford 12 or so years ago junk new napa sensors. got one from the ford dealer worked haha so from then on I dont use any aftermarket ones. crazy how picky the specs for calibration are another great video from you man cheers

@victorbellan8357 Год назад

Did get some value, you made it easy to follow, thanks

@markmalikowski4971 Год назад

Another excellent diagnosis. It's unfortunate that the converters are junk. Hopefully the customer understands what happened,

@kittty2005 Год назад

I don't recall what problem I was having with my primative '83 Olds. But I learned a little about voltage dividers and resistance and found you can increase or decrease resistance with sensors and fool the computor into thinking a sensor is reading correctly.

@lexteakmialoki5544 Год назад

Awesome, the Master at work. Thanks for the education.

@joesoplar7393 Год назад

Fantastic job, Eric!

@rationalguy2744 Год назад

Lots of good stuff here. My Subaru ej25 was running rich enough to wreck the cat. The coolant temp sensor was bad. The replacement stanpart was not calibrated ideally. Oem from a dealer solved it. Reducing part numbers by "retionalizing" their inventory could lead to unfortunate compromise being made by hasty penny counters. Their gain was my loss.

@dexranch 5 месяцев назад

Excellent teaching moment Luv the channel

@mark_osborne Год назад

Fantastic. I was really wondering how a circuit could fail in such a way as to have "too little resistance"...ha !

@mjh123crh Год назад

Eric O, I learned a very long time ago that brand new does not mean brand good, keep on keeping on!!!

@willmm4745 Год назад

Another awesome video. Worked on my dads silverado 1500 to get it to pass smog. did all the stupid driving conditions never got it to clear the evap monitor fortunately i didn't need that one to pass the test here but i wish i could seen this vidja a couple weeks ago.

@Mac-mu9cs Год назад

Always fun when you fix issues and now a full drive cycle runs and finds even more issues. Especially evap

@lonwillis783 Год назад

Thank You Eric 👍😀

@dprrn Год назад

watching the O2 data showing it test the cats in real time was neat, reminds me of when I had a cat replaced on a buick to rid the 0420 code. few months later the light was back for the same thing. ended up watching the data while I gave er the beans and the rear sensor settled down. I just let it clear the light on it's own to be sure it was cleared.

@troysmith9453 Год назад

You are a bucket list for me 1 of only a few.

@smiles7631 Год назад

Thank you guy! Great video, great info. Got to have the service info kids! Can't get around it these days.

@kyletuttle9064 Год назад

Cool diag and monitor lesson Eric.thanks for sharing .

@gregbellinger5765 Год назад

The most successful advertising is providing knowledge, skills, and attributes when solving problems. Eric nails it without embarrassing people too much. He does make people wonder why dealerships don't do deep problem solving. I guess the answer is not enough ethical standards. It's one thing to throw parts at a problem to solve the problem, but throwing parts at a problem and still not solving the problem is criminal. Mistakes are normal but trust is the most important result.