Dreaded P0300! We know what it's NOT! 2005 6.0 5.3 Lq4 P0455

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Customer Customer States Mechanic Fails Engine Transmission Gas Diesel off road race 4x4 street car daily driver scam dealership dealer technician how to

[@devinangola3458]

Not to sure why you’re apologizing for using the scan tool, that was the best part!🙂👍 Your dedication to solving the problem is amazing, trouble shooting in real time! And the wife unit and Troy picking up the slack for you is heart warming.😉 You have a great day Rainman.🙂

[@IR-nq4qv]

Scan tools are necessary for diagnostics, if an apology is warranted, it should come from the repetitive transmission and engine flush / snake oil product infomercials, they get old after the first flush.

[@mod_incllc3235]

@@IR-nq4qv but he always say's "not a sponsor" when using said products.

[@IR-nq4qv]

you don't get to have a legit response to an opinion when you use "always" and "said products" in the same sentence. You must know what products that I'm referring to as I never mentioned the name in my previous post otherwise you wouldn't have coined the phrase ''said products'' .With that.., It seems you're in denial, you dozed off or weren't paying close attention to the BG thumb nails and the hash tag BG product name used in past brake fluid, engine oil, transmission flush / repair videos and video title descriptions. There's nothing worse than someone coming along and trying to steal your eyesight and intelligence at the same time.... I don't care, it's none of my business if Ray uses Crisco or Corn oil, I don't care if he's a sponsor or not, that's his prerogative. Can't a viewer honestly express himself to say he isn't into mundane repetitive flush videos highlighting the same products that look very similar and take on the feel like infomercials? How many flush videos are too many????? You don't have to give up honest opinions to subscribe to channels you like @@mod_incllc3235

[@DonsJunkmail-vg1wt]

​@@IR-nq4qvyeah...there's flushing going even at Mc Donalds.🤧

[@DonsJunkmail-vg1wt]

And how many cereals in the grocery store? Cocoa puffs or frosted Luck Charms.

[@Andrew-ep4kw]

2:57 Troy is not afraid of crappy tedious work. This guy is a keeper.

[@carlmaruyama6863]

I think everybody has a better attitude when working in a clean and organized environment. I have noticed since Troy has been working, the shop is organized.

[@forgetfulme1719]

means business slow.

[@DonsJunkmail-vg1wt]

'We don't pay him much"....

[@DonsJunkmail-vg1wt]

Why not weld the ground connections😁 Melt rust and dirt together🎉🎉

[@DonsJunkmail-vg1wt]

So how much more do you pay in taxes for a cleaner gasoline??🤔

[@williamdawson3353]

This is how we know you guys have a wonderful marriage. Getting under a running truck while your spouse is switching between forward and reverse is just awesome.

[@mikeyhau]

Not that I don't trust your wife, but I'd chock the wheels. Belt and braces save lives.

[@quietsignal]

He doesn’t have any life insurance😂😂😂

[@louietramposch4559]

Wife unit 👽🤓🎬

[@maxwellsilver3115]

But she knew there was a camera rolling 🤨

[@daniellaughlin9726]

I get much more out of a diag. videos than just turning wrench videos. Thank you for all your hard work.

[@GARDENER42]

Aye, the diagnoses are the most engaging parts for me, especially when they're real puzzlers like this one.

[@dawsondetrana5496]

I agree

[@theronwolf3296]

I agree. The value of these videos is that share thought process as opposed to 'how to do it'. I learn a lot even when the vehicles are quite different from mine.

[@DonsJunkmail-vg1wt]

I think being all day long on the 'tire machine' is the Real "go to" video 🤗

[@davepoling3049]

​@@theronwolf32963q+

[@wboyd33]

You go Troy!!! Give those walls hell & make the shop shine like no other person can!!! You're doing an awesome job...please keep it up!

[@throttlebottle5906]

poor fella(real trooper) Troy is. I say move everything 1/3rd of shop over and use pressure washer, after soaking with good degreaser. yes it will make a huge mist cloud and cover everything, so cheap plastic(painters drops) will be great.

[@michaelpressman7203]

And Maya too!🎉

[@dcbacon1]

I really like Troy, he stays humble enough to encourage Ray to teach him all he can, but appears sharp enough to show he appreciates the association. Please stay with Ray for a long time...

[@josepherhardt164]

Actually, in a shop where the boss buys brake clean by the gross, why are you expending this much effort? ;)

[@DonsJunkmail-vg1wt]

Well who cleans the bathroom(s)? Maybe the Snap-on tool guy?

[@ED-ti5tc]

Another reason why i tune in for Ray's repairs! Always learning something!

[@FourSeasonsNorth4x4]

Ray, Eric and Paul…(plus a few others)…not always or necessarily in that order. 😉😁

[@albertjohnson8108]

I get the videos with scan tools may not be the greatest for everyone. But it definetly lets any of us take the opportunity of seeing how you use the scan tool as an actual tool to eliminate and potentially solve problems! Great video. Helps me and everyone else see how to surf on a scanning device rather than getting lost in the numbers.

[@MrCliverlong]

Respect to Troy for digging into the less glamorous job but are so important for a decent working environment. He's a gem.

[@bearpuf]

Hi Ray. This video was completely mesmerizing to me for you rethinking what the cylinder misfiring issue was everytime you went through a procedure and it failied. Finding it to be a faulty MAF sensor surprised me as well. One of the many things that makes your channel special is that you make the continual effort to share the dead ends to solving a problem and when you make a mistake on your end you don't delete it. I admire you for that, and as I've mentioned before, it builds my own confidence as I'm sure it does for others. Thanks for the terrific ride today.

[@danielweilert]

Troubleshooting is an art form in and of itself. If you have to eventually fire the parts cannon it helps to know which way to point the cannon. Kudos Ray!!!

[@user-tf3ir8sc5m]

When it is the right part, it isn't trally the parts cannon.

[@charlessmarr7107]

Since I am mostly an old school mechanic these trips into the controls, inputs and outputs of the Great Black Box are very enlightening to me. Especially your unique ability to translate the data into real world observations.

[@seanwieland9763]

2:53 lol, he’s thrilled to be doing literal side work. At least it’s paid work!

[@pud469]

A toothbrush with some spray works really well for throttle body cleaning. The stiffer the bristle the better, but i typically use which tooth brush needs to be replaced first at home.

[@edwardcarberry1095]

Ray, your very good at what you do! Please don't change. We watch you because of that!

[@weirdwillie]

Ray don't apologize for being on the scan tool most of time. U probably helped a lot of people now and in the future who might run into the same problem with there vehicle. Awesome video.

[@jimsix9929]

yea the airflow sensors on gm trucks can give you misfire codes or lean mixture codes, cleaning them will help some but I only use that to diagnose that that is the problem, you did the right thing by replacing it

[@Conservativetruckeraz]

The amount of integrity you have makes you one of the best mechanics out there. I'm sure most big shops would have just said to replace the coils you actually take the time to fully check and make sure what needs done.

[@Bulletz4Breakfast13]

Most shops have a 25min Diag limit. Then they ask if customer wants to pay for Diag, most don't because they charge $130-$150 for just looking at it. Then the bill is usually above $800. They only give the master technician 20% of the customer cost. Shop takes in 60-70% If they say yes charge me $800+ then they allow 2hrs. Which is what Ray did at the start without the charge. A professional master tech with extensive electrical knowledge would have done the following: Logical Diag Procedure for Misfireing Cylinders: 1. Mode 3 = Check DTCs take a snapshot or jot down, dont clear them! 2. Mode 7 = Check Pending Codes, snapshot don't clear anything! 3. Mode 10 = permanent codes. 4. Mode 2 = Check Freeze frame data. Freeze Frame Data is the operating conditions recorded at the exact time the ECM lit the MIL check engine light. 5. Research procedures of changing electric components and integral parts. There can be specific order and requirements. 6. Read TSB's related to coils, injectors, plugs, engine compression, ECM. Replace or update the TSB component. • Notify your client of any TSB's and explain the potential dangers of not fixing the issue, possible cost of repairs. If the customer accepts cost of repairs, perform all repairs in a timely manner that matches with book and service protocol by repair manual. • If none of that worked you use a oscilloscope with low amp clamp probe after checking all wiring diagrams, hook up to ignition coils and fuel injectors usually from fuse relay, one usually powers the coils separately and another powers injectors. The coils should show a burst, collapse and secondary jump and oscillation after the primary winding collapse charges the secondary winding in coils, it will match timing with injectors amp and voltage surge/drop and collapse in the same millisecond timeframe

[@lupinesithlord1693]

Wish you were In The cleveland area

[@Bulletz4Breakfast13]

@@lupinesithlord1693 get a digital multimeter $15, Digital DC Clamp Meter that measures low Amp in mA it just clamps around a wire and measures amperage in that circuit like fuel injectors. Those can be as cheap as $50. A compression test kit is just $30 and it has a rubber side that you put in place of a spark plug and it measures cylinder compression, you do each cylinder while cranking engine, make sure all of them are 20psi from each other let's say all are 110psi and one is 170psi that's over 20% , there are tutorials for compression test on KZbin. Testing fuel injectors is done with oscilloscope and low amp clamp with a back probe (a pin that connects on multimeter leads that you insert into the connector pin of the power wire for injectors. Scopes read in hundreds thousandths milliseconds while multimeters only read 500ms so multimeters can fail to detect some misfire problems in injectors and coils. Look up wiring diagram for your year, make, model on the ignition coils and injectors. 4 pillars of engine problems (misfires as well): 1. Engine Mechanical Condition = specifically the engines ability to compress the air charge and seal the combustion chamber. 2. Engines ability to breath AKA Volumetric Efficiency: this encompasses any condition that prevents air getting in and out of the cylinders. 3. Ignition = Ignition coils and Plugs. Covers everything about delivering a strong spark at the right time. 4. Fuel = this cover's not only fuel delivery but proper fuel mixture. Delivered cleanly and at the right time through injectors and into the combustion chambers at the right spray speed and pressure. These are the tests needed: • Swap Coils, check spark plugs visually. • Do cylinder compression test, anyone can do this if you can remove spark plugs, look up a engine firing sequence diagram on Google, it will show the engine orientation and which spark plug is which # cylinder. This will help you identify which cylinder is misfiring and what plug needs to be replaced and what coil to swap and what cylinder to watch for on compression test. • VE test(volumetric efficiency test) for engine breathing. • Spark plug tester. • 14.7:1 ratio of Air:Fuel test, check MAP, MAF sensor and O2 sensor with fuel trim long term vs short term on scan tool. • low pressure guage for fuel injectors • injector balance test or look at fuel trims "injector test"

[@neilmurphy845]

​​@@Bulletz4Breakfast13That sounds like exactly what Ivan would do and him and Eric are very good at finding the problem.

[@dond.200]

Troy seems to be more comfortable working along side you on the videos. He also seems to help keep your shop more organized.

[@charlesschneiter5159]

To come back to your aviation content 😉: It's very, very rare that heat is affecting landing performance to such an extent that operations are not possible. It's the take off performance that suffers with heat - and greatly so. Hot air being less dense than colder air does markedly affect aerodynamic efficiency and engine power output to a point where either the payload has to be reduced or the departure time has to be shifted to a cooler time of day. Ahhh... the 757! What a magnificent machine this was. One of Boeing's finest IMHO! And what a magnificent youtube channel of yours this is - I greatly enjoy each and every minute of it! Greets from an old retired Boeing driver car enthusiast and DIY mechanic ...

[@richardaston6361]

I do like the in depth scan tool video's 👍

[@patrickphelan3676]

Hi Ray, the temperature thing for aircraft has to do with Density Altitude; which directly affects the performance parameters of any aircraft. The higher the temperature, the "thinner" the air or DA. The DA is critical for aircraft during emergencies of reduced power, like an engine failure during take-off. Each aircraft has a specific chart for calculation.

[@ko9446]

And avionics don’t like high heat. Been stuck a few times on the ground with high heat

[@LeverPhile]

"Thinner" air means less lift and the need for faster take off & landing speeds, which means longer runways needed ...

[@Rekuzan]

RAY!! DON'T FORGET!!! Every time you turn the key on, the PCM flashes the sensor elements inside the MAF really quickly to burn off any contaminants on the elements present, and this does cause them to wear out over time, and the sensor just gets lazy.

[@matthewsykes4814]

I've been there myself hunting out a fault a long time ago on something a lot more complex. Did the same as you, found out as much as I could that was working properly before spotting something that looked wrong. It was a badly repaired cable in the end. I still remember doubting myself all the time until I got the root cause. Like you I didn't give up. Great work as always Ray. You are a credit to your profession and it's great to see your lot so full of cars waiting to be fixed.

[@grahamcockerill2406]

It's great to be able to understand how the scan tools operate and to remedy a problem. Thanks Ray. Aussie Graham

[@donalddrake6512]

Amazes me how just a simple replace on the mass airflow sensor can have such an effect on an engine. I felt your frustration Ray and your elation at the end. That's what I love about your videos.

[@davidpederson2905]

I really liked the attention given to grounds. So easy to overlook. My standard for parts canon: not really firing the parts cannon until the windshield washer cap has been replaced ... for the second time.

[@larrybe2900]

Unless he did the first ground he showed us off camera or didn't share the work with us he did not do what I feel is an important part. Just deferring to the brain side of the equation grounds does not fully deal with the ground matter. I can think of another variable even if the vehicle starts and that is the strength of the battery.

[@Bellboy40]

@@larrybe2900 He explained later in the video what he did about that first ground he was looking at. He bypassed it with another test wire to a good ground and it didn't fix his problem.

[@MonkeyJedi99]

That is an ORGANIZED and detail-oriented customer! So much better than someone who drops off the car and says, "Something's making noise, please fix it." - I don't keep the same level of detail as that vehicle's owner, but I do type up a symptoms list and leave a cop on the dash for the mechanic. - One time, on my Saturn, I went DEEP into the woods chasing a lack of low-beams. I spent about four hours with a Haynes manual, matching real wiring to the wiring diagram, doing continuity checks all over the place... It turned out there was a burnt-out connection in the plastic-coated parts of the fuse block. I determined that the low beam circuit could be replaced by the DRL (Daytime Running Lights) circuit. The only reason I handed the job off to a mechanic was a lack of tools. The mechanic actually thanked me for not making him do all the wire chasing, and that I saved a LOT of money doing that myself.

[@johndesaavedra1040]

Being of a similar troubleshooting mindset, I followed your deductive process. This is why I follow your channel. I saw the MAF as the potential object once you deducted every other possible factor affecting misfires. I doubted the MAF it too, but noting was left. Thanks for taking us through this journey. All the best to your family and to your company.

[@i.fishtank]

When you started this video, I thought MAP or MAF, I've had the dreaded P0300 and P0200 on my Peugeot 206 for a good while now, the P0200 was a faulty knock sensor and i've just placed the MAP sensor as the fault..... 2 hours poking and prodding.... try 2 months Ray ! (Amateur DIY mechanic who stripped out the whole throttle body, wiring loom and replaced pretty much everything apart from the Wife Unit)

[@bryannikkila9751]

Good morning from Higgins lake Michigan

[@RukarioEnterprisesLLC]

Here's a few things to point out. Vehicles way above 2000s (1990s I do think also) have a few extra parts called Crankshaft Position sensor and Camshaft Position Sensor. In my 2011 Sonata, before the Check Engine Light came on, it had a misfire, so we checked it out and it was the Spark Plugs and CPS. A ready-to-fail Crankshaft Position Sensor could be the culprit.

[@mlg1783]

Oh yeah. It's 105-110 out here in southern Arizona. Just love turning the AC on after work and being blasting in the face with flames for about 4 minutes before it cools off.

[@KennyBaltz]

Ray, I will bet if that truck had gone into a Chevy dealer for that P 0300 code, they would have changed, plugs, wires, coils, and no telling what else. It would have cost $2 to $3,000. He would have gotten it back with the miss still there and some crazy reason for the miss. Great job Ray. You looked at all the data and went after the one thing that was very slightly askew. That truck is very lucky to have rolled into your shop for repairs! You keep wrenching and we will keep watching! ❤ -KB Chesterfield VA.

[@Bandicoot2001]

Usually what I've came across is pressure cleaning injectors for po 300 but I'm in a colder climate area. Lean codes for the platinum melting. Any mass air problem I came across would stumble on acceleration. I was able to clean them usually and they failed because of cheap after market air filters. Don't know what chevy dealership throw parts at vehicles but that didn't happen at our facility. Retired from it awhile ago don't miss the flat rate warranty.

[@tomredmond]

A good diagnostics video is always welcomed here.

[@peasmold1234]

That was outstanding work Ray, I've learned so much about using scan tools, (I'm a long retired uk mechanic) never had scanners in my day, a good ear was important then.

[@peasmold1234]

Neither are mine now :)@@peten8767

[@raymondniven5281]

As for the clunking noise from the driveshaft, check the rear straps that hold the universal caps in the yoke on the differential. They might be stretched, or loose, causing the caps to rock in the yoke. I ran into that on some Suburbans, before you tear the cover of the differential. And from one Ray to another, have yourself a great day!🇺🇸💪🔧🔧

[@scottdowney4318]

I would have tried MAF cleaner. The 3 little sensor resistors can get a dirt buildup. I also hate buying parts unless I try everything first. Pretty smart of you to consider the MAF, which does have an effect on misfires. I have even used a light very soft brush on those before which your told not to do as they can break.

[@boblemon2103]

You don’t need to parts cannon the mass airflow, just unplug it and then it uses some default values, probably would have shown no misfires and then you know you need a new one.

[@craigsparton]

It didn't need a new one, this did not fix the vehicle. Notice how he took it on a test drive and warmed it up before checking for misfires again? You'd never do that unless you wanted to skew the results. You'd immediately check it in the same conditions.

[@darkerbinding6933]

Congrats on being able to avoid that Rusty ground bolt on the engine block!! 🤣

[@miketrimberger7686]

Give Troy a bonus for cleaning those grody walls!

[@georgechristilaw6282]

Doesn’t it figure, after all the diagnosis it always seems to be the last thing you think of as being what the problem is. You are relentless with your diagnostics and thorough. Great job!

[@ahoytheremate1954]

Ray i had 2 air cons in my kenworth road train and 2 compressors because of the heat in the centre of aussie in summer about 50c in summer

[@user-jp4ds9ef4u]

Morning to you too

[@TairnKA]

In this situation, "If all else fails, trust your hunches" and you did, based on your experience and skills you chose wisely and that issue has been resolved. Good work Ray (you should debrief Troy on this resolution?). ;-)

[@wschuurmans1]

Troy is really a golden assistant you have to look for them with a light these days.

[@johndernberger1961]

Great diagnostic journey! Thx for sharing

[@mishahendriks3020]

Maybe install some sort of exhaust extraction apparatus/hose so as to prevent (as much as possible) re-grime of the walls? Especially when the car is backed into the shop? Can’t wait to see the shop going to a new level! Good luck! Nice diag, not really a parts canon, as you only fired one shot. Based on diag. 👍🏼

[@bradhaines3142]

not likely to help with doors wide open all day. itd likely be best to make it a yearly holiday project to just do a whole shop pressure washing

[@russellstyles5381]

@@bradhaines3142 This shop is small enough to make this pointless in warm weather, but a good exhaust extraction system might allow heat in winter. Assuming you ever have cold weather there. Hey it does happen, 8 or 9 times a decade.

[@hass1337]

Heya,Ray here in saudi it’s around 120 on a daily when it’s summer and the only cars that have REALLY cold acs are the Toyota/Lexus and the Germans granted with quality window tints and parked in a shade

[@mq9167]

I'm amazed that even wirhout physical proof the Mas was the problem you fired a direct hit. You never fail to impress me with your trouble shooting skill. Well done yet again Ray. 👏

[@davidp7163]

Great video Ray! I really enjoy the head scratchers, sitting here trying to think along with you what it may or may not be. Have to say, didn’t see the MAF being the cause. Great trigger pull. Good Job!

[@mtn.homeforge351]

Thank you Ray. I learned something today. Please keep up the great videos.

[@jsh6952]

Those GM driveshafts suffer from an oversized bore for the splines, that lets the splines wear out and get sloppy. Eric O just loves redoing grounds, especially on Jeeps and Rams.

[@976rick1]

I actually loved the scan tool lessons, it was so interesting how you eliminated all possibilities And found the cause. I wish i lived near by to have my truck worked on by a competent mechanic.

[@badassbiker1974]

Good day to you, Ray! Don't worry about this being a scan tool video. It's good to see how your mind thinks during the diagnostic process when faced with a more challenging problem. I commend you on this one. You stuck with it, a bit of trial and error, and got to the root issue! Well done! 👍 👍

[@MarzNet256]

I think cleaning the TB is always an excellent idea before instaliing a new (or cleaned) MAF sensor.

[@MadmanJimbo]

The correlation issue on the TPS is the accelerator spring tension. The plastic bushings in that module are made oblong by the high spring tension. The tension or “hysteresis” changes through the stroke. That tiny bit of slop is enough to cause a tilt inside the sensor on the tracks. So the voltage differs slightly. This will not cause misfires. But it is the explanation to the TPS track variances when you let up on the pedal. In any case, the ECM has an algorithm that corrects for this issue. Don’t ask me how i know. Lol.

[@Patriot-bn9om]

Thanks Ray, this is very useful. I have a Silverado almost identical to that one and around the same mileage. If/when I get a P0300 and misfires, I'll go straight to replacing the MAF sensor.

[@ORRadtech]

MAF is something to keep in mind but it's far from the most common problem. You really need to follow a logical troubleshooting regime just as Ray did. The MAF was his LAST stop, not his first, because there are so many other things that are much more likely. The parts cannon should be your last option not your first.

[@bradleyrorabaugh7764]

Hey Ray love the videos keep up the work. I had a random misfire that took me a while on a chevy ended up being a intake gaskets. Still finishing the video 😂

[@kevincurry4735]

Good day Ray. Thank you for all the videos that you put out. Your diagnostic ability is awesome. You Sir have a great Sunday.

[@tenshiaurion9]

Watching you going over the system looking for the problem is teaching me a lot along with your narrative. Best vid in a while IMO.

[@GeminiSeven43]

Thanks so much for taking us along Ray and the scope is a wonderful tool and many of us watch these channels to learn more about how to interpret the data. Anyone can fire the parts cannon and replace parts but knowing why and why not is what elevates the average wrench turner from the technician. Going through each step with you helps all of us as you see what is not causing it and getting to the final step even if it might not seem likely. Take care and have a great day.

[@robertsensabaugh5785]

Ray, thanks for showing us that misfires don't always have to do with ignition parts and that should not just assume that's the problem

[@dback68]

In my opinion, this is why "parts store" error code readings can be somewhat dishonest for the end user. I can guarantee that any major chain store would have sold a whole set of wires, plugs, and coils and the customer would have still been at square one.

[@Estranged180]

Nice catch, Ray. It's funny how a minor fault in the mass airflow can affect fuel trim so minorly, that it causes major malfunctions that throw people into a spiral of what's not wrong with it. It's also funny that when that minor fault is not quite identified, but shot down with a parts cannon that rectifies the rest. Then there's the feeling that you threatened the engine with an airgun over a P0300.

[@patrickchavez3848]

No apology needed!! You stuck with it and came out the victor!!!! Woo Hoo! Perseverance wins again. You so totally ROCK Ray!!

[@LilYeshua]

Back in the late seventies and early eighties at my service station job,part of my boss's customer base were little elderly widows who had primo examples of sixties cars that had extremely low mileage and parked under their car ports meaning that they looked practically new. It was my turn to run the station as I and my boss would take turns working every other Sunday,we had one of these widows cars in the work bay for service. It was summer and hot so I started it's engine, raised the hood,put a shop fan in front of the radiator,and turned on the AC. So,in between customers I would get in the car and enjoyed the 23 degree Fahrenheit cold air coming out of the dashboard vents. Yeah, you're right,they don't make AC systems like they used to.

[@module79l28]

But the million dollar question is: did you tighten the clamps on both sides of the MAF sensor when you finished the job, Ray? Because apparently you went on the test drive with them loose.

[@CH-oi1dz]

I saw that too but he did he like to keep us on your toes

[@joesilverbliss1721]

Me too. He probably checked it later

[@fishflash1]

Just a guess, if they weren't tight, the readings wouldn't look so good.

[@SiblingCreature]

There was a jump cut right before that test drive, which I'm pretty sure is when he recorded that bit at the beginning with the air gun, so I think it's fair to say he tightened the clamps in that short period "when [we] weren't looking" as Ray likes to say. 🙂

[@572Btriode]

Yep, the downstream clip wasn't seen to be tightened and it's really doing my OCD. . . . . . . I would also have binned those Bosch (made in India) plugs, couldn't care if they're new or old, they have a zero reputation in Europe, NGK are the general go-to.

[@xunheilvsnipezx3324]

Not for nothing but i was having the same issue with my 05 Tahoe 5.3..... The fix new knock sensors and a valley cover. My scan tool registered misfires on my scan tool but disnt feel the enging lug, jump, sputter, no physical indication... So i popped the intake and took a look at the knock sensors.... Rust city, so badly i ordered a new valley cover and gasket to remove the corrosion i couldnt see, once replaced the misfires dissapeared.

[@xunheilvsnipezx3324]

Also not for nothing, i see lots of new parts everywhere on that vehicle, If it isnt US, Canada, or mexico AC delco, or GM original the parts may be broken, new from china.

[@deangaryjames]

Found this really interesting, i'm retired now, but when i'd spent time diagnosing an electrical fault, i would take home the wiring diagrams and study the crap out of it, i mostly worked on brand new vehicles so it had to be an assembly thing, sometimes a French person would put a screw thru the harness , or bolt the harness between the hinge and body, so satisfying once we track it down! But i'm retired now, so i cease to give a damn! I watch you doing my old job instead. Keep it up!

[@jamesjohnson8824]

This episode reminds me of an encounter with a new Pantera MANY years ago. It was brand new. Only made it about 40 miles from the selling dealer before breaking down. Panteras used a Mustang 351 Cleveland 4 barrel as otherwise used in a Mustang with a manual transmission. That meant it had a dual point distributor. Long story short, I identified SEVEN verifiable issues that could have explained the reason for it not running. First of all was a loose screw for the grounding strap on the breaker plate in the distributor. What I learned early in my auto technician career is that you fix what you find and go from there. The truck you were dealing with in this episode had MANY issues contributing to the way it was running and you saw improvement with each one you identified. But you knew there was more to it.

[@JBreeze4598]

Great work on the walls Troy, your hard work is adding more LUMMINS!! Good job on the Gremlin Code hunt!!

[@michaelanderson8010]

Great video Ray. I enjoyed that, your determination paid off!!👍👍👍

[@StealthMode139]

Amazing Worx and Master of fastener Extraction. So Glad to be here. FL

[@fubartotale3389]

Just glad I live up here in the north and not in Florida. Good luck y'all going forward...

[@cranefly23]

An excellent and fascinating bit of detective work there! Well done, Ray. 👍

[@phillipw2493]

The perils of intermittent problems good job and way to go Ray😊

[@Bears58]

Ray you crack me up with a rotating spider as an example of how hot the engine is. I love watching your videos

[@rhodium69]

No matter what the problem is , you always manage to find and fix it. Your one hell of a mechanic Ray and people are very lucky to have you work of their cars/trucks.

[@dowh9577]

As someone who is trying to master my own prosumer scan tool, I get a lot out of observing how you collect and interpret the data it provides. Your analysis gives me ideas, even though the UI is different.

[@Pointlesschan]

Do you watch south main auto? His use of the scan tool is great also

[@legogummybear5]

It is what it is Ray. If we didn't enjoy it we wouldn't watch :-)

[@mikehunt908]

Straight up 👌😎

[@brianwaldo2642]

Actually, getting stuck inside the scan tool is exactly what a lot of us needed. Correctly identifying anomalies and executing some sort of action is the crux of being a good mechanic. You diagnosed what it wasn’t, leaving one possibility common to all the cylinders and acted upon it. Problem solved and fixed. Well done Ray.

[@jameswise8870]

The scan tool us just that, a tool. And you are a master with it. All of us DIYers learn so much from you and Eric O. Keep on bringing us great videos.

[@colestowing8695]

much as i hate the "parts cannon" method, sometimes you gotta go with what experience tells you and take a risk. I might have tried a quick clean of the mass air but "replace with a known good unit" is an option for a reason. I definitely agree with getting the oe part though, cheap parts are f'ing garbage these days (I've gone down some rabbit holes trying to diag problems with brand new parts that are worse than what they replaced-I won't do it anymore)

[@howiej4084]

I agree. There is a time and a place for everything, even the parts cannon. That being said, I kept my old ride. So the parts cannon is really a swaperoo cannon.

[@colestowing8695]

@@howiej4084 good for you, keep that old rig going!

[@bradhaines3142]

when the boss gets right there next to you and starts cleaning, you know you have a good boss. hope you guys mention how much the cleaning helps so he doesnt get too miserable with the low tier labor

[@gridlore]

Ray appears to be a supportive mentor in every way, so I'm sure Troy is getting positive reinforcement on the drudgery tasks involved with running a shop. It's all training to do things right. He's probably learning to be a service writer off-camera.

[@AntonioClaudioMichael]

Great video Ray Definitely got me thinking trying to figure out the issue which was strange looks like maf under or over reporting was the issue with the random misfires look forward to the next video @Rainman Ray's Repairs

[@jeffrowlan9877]

when I first turning a wrench a man I worked for gave me the best piece of advice... and that was if you keep going in circles, walk away clear your head! the answer will come to you. even in my later years I be came a construction superintend. and still revert back to that advice

[@getonlygotonly]

its great that you explain how to do specific repairs and you have the experience and knowledge to do things properly as there are so many hacks here on KZbin that dont have a clue what they are doing and want to try to teach others with a pair of vise grips, some priers and a big shade tree

[@markraday8071]

Good morning Ray, outstanding video! Say hello to your wife unit and Troy. The process of elimination was outstanding! Just like the title of the video, you need to find out what it's not, to get to what it is. Your scan tool is badass as well as your ability to use it. The entire video was very entertaining 😁. Say hi to the wife unit and Troy and don't forget to have a great day and stay cool 😁.

[@mod_incllc3235]

his scan tool is your standard bi-directional . which is why all of us with similar scan tools get so much out of this type of diagnostics. Only thing that would bring it to the next level would be Scope diagnostics. He probably would have gotten to the same result in less than half the time if he would of used something like a pico scope. But there's more than one way to skin a cat.

[@trekOCLVone]

This video was one of the best troubleshooting videos ever. The process of elimination. Rainman - just didn't give up until there was proof that the engine is now running properly. A+ for Rainman (Ray).

[@christinaanderson8195]

I love learning something new every time I watch

[@joseramonvargasgonzalez3042]

Have a nice Sunday.First😊

[@billmurray4895]

Ray, have you thought about using dialect grease on these grounds? I use it where corrosion is a concern.

[@wayneessar7489]

Florida dialect is very understandable.

[@rickb831]

I wish we had a shop like Rays's near me.. I've sent two appointment requests in these last 2 weeks(and had no reply). If we do not connect, I offer a gentlemens hat tip! Ray is what I call a true Master Mechanic. Keep up the excellent work!

[@tombowman2154]

I love how thorough you are.

[@darrelladams4188]

For trying to clean the shop panels….. try a good degrease ( like restaurant degrease ) or oven cleaner.. YES GLOVES would be a must

[@jsh6952]

Simple Green or Awesome Orange will do the job.

[@OUTLAWBBQ]

ATF will make it shinny. Cleans my tools up to brand new looking.

[@caymanchristopher7014]

You reaaaly trust your wife.

[@craigquann]

Good to see younger "kids" with a work ethic! Very VERY rare these days.

[@kassemadam3005]

You act like these scan tool/diag videos are boring but these are exactly what I am looking for. I enjoy the chillax repair videos but I also want to learn more and these videos help a lot. More pls

[@richardsmith2721]

Did you see the Ferrari plant? They have skylights for natural light and greenspace with plants and trees.

[@brandynstieger4786]

Them p300 man got to love them 😂

[@Emily-ou6lq]

nothing beats the U0100 though

[@brandynstieger4786]

@@Emily-ou6lq even saying it hurts my head 😂

[@codymurinko4917]

Love Your work!!! Watching and listening to all your methods makes mechanic work more approachable. Im a Chef by trade but you definitely help keep me motivated to keep my car maintained and loved.

[@sjkborn81]

This video was absolute gold for me. I'm dealing with the exact same issue on my 07 pilot. I'm just going through the steps of what could be. I have an ACTUAL scan tool, so I'm able to watch live data. I have been doing a parts cannon on it. Bought it 2-3 years ago 140k miles all original parts so it's getting fun to say the least. But she's a good vehicle, just trying to breathe new air into her