Had this issue on my Aunt's Audi. Couldn't find the problem until I cleared the code and took it for a drive, code would come back as soon as I used the brakes!

Wow! Great work, Dave......Most Dealers would have replaced $3,000.00 of perfect stuff, and then announce that they can't find the problem!

@biz4twobiz463

4 ай бұрын

TRUE!! Which is criminal that shops get away with that all the time. Almost ZERO accountability for getting it wrong.

Reeeeeee!!! No wife unit appearance!!! No shameless self promotion of drink cups and such!!! Great recognition of Dave’s work!👍. Ray, stop worrying so much about the length of your videos, it causes you undo stress. Most of us don’t mind😁

@williamsquires3070

4 ай бұрын

Yeah, where’s the shameless self-promotion of Rainman Ray merch? Where’s the lovely Lauren? Have you hid her in the vault of viscosity again? Okay, just kidding; I don’t think she would fit in there. Hmm. 😊

@andrewcastiglia9548

4 ай бұрын

His views are down bad compared to a year ago.

@mike.47

4 ай бұрын

Ditto

@peteraitken6494

4 ай бұрын

Hi ray well done to Dave good man to have in your shop,all the best for the week ahead 👌👍🔧🔧🔧❤️

@mtn.homeforge351

4 ай бұрын

Great job. And we like the longer videos. They are a great way to start you day with some coffee! Ray and wife unit take care, God bless, and have yourself a great day!

That there Dave guy is a pretty smart feller!!👍👍😁

Excellent diagnozing done by Dave.... Great video Ray!

Good job, Dave! 🏆

That was one of the first things my instructor told us in brakes class. Pretty neat stuff though

Crazy! That's what good diagnostics skills can do.

Excellent explanation of P0171 code. and great trouble shooting on finding leak.

It's awesome how the smoke machine makes confirmed this diagnosis.

I'm convinced You are a Doctor, great diagnostic skills 🙏

Very nice! Never would have thought to look at the brake booster for a vacuum leak. Learn something new every day.

You have inspired me to work on my own vehicles again. Thanks for the great videos like this and the long videos as well. Learning a lot.

Good set up Dave, made Ray's job easier ,great teamwork 😅 keep the videos coming 😅

I have used my smoke machine many times and have never even thought of using it on a brake booster. Good job and thank you

I once worked on a Jeep, where the brake booster was so bad, you could hear a sucking sound that changed as you applied brakes. As you might expect, the vacuum leak was bad enough to make the engine run really badly.

hay Ray it does not matter the length, it is always great content and you always learn some thing new and interesting during you fine videos! just keep up the wonderful work.just wish you were near by!

Ray I consider this an extra video for weekend viewing nice. Make the video long medium or short we ll watch them all

I have a ‘07 CRV . I really appreciate you showing them. Just changed brakes and rotors, you inspired me to diy it. Great Work as always.

Hello from the literal arctic. We got about 2 feet of snow here today

@sammorgan2390

4 ай бұрын

Brrrrrrrr

Thank you for the lesson. I never would have thought of that. If someone told me my brake booster was the cause, I would have thought they were lying.

Ray, you have a great channel and I have been able to learn some interesting tips and techniques even though I am in my 70's. You have confirmed that there are still some real mechanics out there who care about their customers.

Well, he did say he wanted to trim the video times. Mission accomplished.

Proof positive that you must test the entire system. Good catch by you and Dave.

Sad to see you back off. I am an electronics guy, and watching you is like a mechanical apprentice training course. You should package up your videos into a dvd training package for students.

Dave’s diag for the win👍👍nice work fella. ( Reckon he’s a keeper Ray👍👍)

Brilliant to learn. Thank you.

Good info to know! Never would have guessed the leak was in there !! Keep up the good videos

There you are

@johnt.848

4 ай бұрын

Thank you for making a daily appearance, even if it is only in comments.

My dad had a brake servo (thats what we call them in the UK) fail on his old Austin Maxi in the 1970's. This was before computer controlled engine, so no fault code. But the effect of the extra air was to increase the engine speed. So he was slowing for a red light, hit the brakes and the engine started to speed up (car was an auto). He got a hell of a fright and he had to finish the journey using the hand brake.

Dave and the smoke machine to the rescue 👍

Ray's point is that MAF equipped vehicles - you have to look at everything that can see engine vacuum. Any unmetered air (intake gaskets, TB gaskets, hoses, oil filler cap, oil filler neck, valve cover, PCV hoses, vacuum lines, EVAP valves, and brake boosters) can throw off the system. Even a leaky valve cover can contribute to the problem (crankcase venting out) No parts cannon - but thorough diagnostics to trace down faults to zero in on the problem

I'm old school enough I've never worked on a engine with any electronics at all. Electromechanical was the thing, if even that. So no codes to guess about. Either the thing ran or it didn't, and if it ran decently that was often good enough. I have to say it's inspiring to see that the darned electronical hogwash actually helps technicians to get things working, and it even improves on "good enough" standards. Last I looked even slightly at one it was all brand specific. You needed a computer from the car brand and those were only sold to licensed technicians and only at ridiculous prices. When I was a kid there was a neighbor who worked on some French car brand in his garage. They sent him the really sick cars that the brand garages had missed fixing at least three times, and he would diagnose and most of the time have it fixed in a couple of days. Those he couldn't repair were basically ready for the scrapyard. This was before the computer was considered cheap and reliable enough to use in ordinary cars. So it was all experience and being stubborn enough to actually find all the weird problems only by hand and feel. I know technicians still has this ability, but modern cars are more advanced, has a lot of tech added that no one had thought of back then. Things such as catalysators or the fuel tank evap that keeps gasses from the tank in check. So having a computer tell you all these details really helps.

Excellent explanation

Afternoon Mr Ray, hope y'all had a good weekend, missed y'all yesterday 😢

Arrrrrr pirate air Capt Ray!! 😂😂😂

You are excellent at explaining how you arrive at your diagnosis! If I ever live near you I will have you work on my car for everything! Keep up the great work!

Great analysis of a complex problem.

I have a 2007 Dodge Ram 1500 with the 4.7l Magnum that started misfiring out of nowhere yesterday. Got it home and plugged the code reader in, and it gave me the P0171 code, Fuel Trim Lean. I looked and listened all over for a vacuum leak, didn't find anything and since the misfiring only lasted a couple minutes out of a 30 minute drive, I thought maybe it was a glitch in the Matrix. Drove it to the bank and gas station, then came home and parked it for the night. Got up this morning to go to work, and no start. Cranks fine, but it's not firing at all. I got out whacked the gas tank a few times with a plastic deadblow and it fired right up. Dead fuel pump with almost no warning. Long story short, if you get a P0171 code and your car suddenly refuses to start, a good place to begin is at the fuel pump.

That's amazing! Thanks for the video

Happy Sunday Ray

I love it when you Smoke My Mind!

Excellent information!!

Happy Sunday Ray.

smart diagnosis!

Good job Dave.

Nice dianostics!

Good to know.

Man! No wife unit?!?!? Come on! She is the life of the videos!

Usually there's a check valve on the booster and they have been known to fail.They are used so you have at least ONE assisted stop if the engine dies,after that you will be pushing a lot harder on the pedal to stop-so plan ahead

Good catch, who would have thought it.

Nice find!

Well done dave 👌😎

Wow never seen it before amazing

Way to go Dave !

Way to go Dave 👍👏👍👏

Finally, a video less than 30 minutes long (or 1 hour.. or... whatever it was these days...)

Dave for the win! 👍👏💯

Nice work

Welcoming back!

Rebuilt a few of them in my time I’m old school was taught how to rebuild a lot of things instead of just replacing them

Nice catch!, 👍🏻

Awesome!

Good to know (I have a 2008 Honda CRV. Bet it would apply to other cars as well)...would never have thought to look there.

I’ve been fighting intermittent Po171 code on a 05 Accord for a long time. I never can find a vacuum leak but I haven’t checked the brake booster, hmmmm, going to call the owner and see if he can bring it by.

75th! Good Sunday afternoon Ray and the wife unit. And the new employees as well! Roger in Pierre South Dakota

@Larry_Harvilla

4 ай бұрын

... which almost nobody who isn't local knows is actually pronounced "peer."

@rogerfleury3591

4 ай бұрын

@@Larry_Harvilla CORRECT! In school in Oregon, we weren’t taught the correct pronunciation.

good one!

No I wouldn’t of thought that would cause that problem. Excellent diagnosis. All good

Ha had a lean code on an f250 leaking from the seam joining the 2 half's of the reman booster broke in two on the way home that evening thanks slow-reilly's at least covered under warranty but a scary ride home with absolutely no brake pedal.

g`day ray good video ...dave for the win..... nice job dave great catch/diag

Cool Ray

Great tip as I’ll be keeping that in the filing brain cabinet😅

That’s why I go though intake 🇦🇺

I just finished a mercedes that had a ton of codes,ecm internal fail,fuel trim,all kinds of crazy stuff! Bad Wheel bearing!!!!!

I think this is the shortest video you put out in a while

Way to go Dave

I had a brake booster fail on a 1977 Monte Carlo years ago. It caused a lean condition. Before I could repair it my brother-in-law borrowed the car. The engine went into my dad's yard truck after that.

This is the first time I've seen 549,000 subs. I'm spreading word, working to reach 550.

great video

Always wise give the MAF sensor a rinse for good measure

First car I ever drove was a 1961 Valiant. No power assist anything. Always used right foot to press on the accelerator pedal, and both on the brake pedal to stop. Plan your stops in advance.

I've encountered many faulty brake vacuum boosters where they are usually filled with brake fluid or oil affected on older cars. They can be rebuilt.

Ray interesting Dave gave you a nice video and you gave him credit (a short weekend video) Ha e a good weekend

Nice

REEEEEEE!!! The proof of the puddings is in the eating. :-)

You’re a generous!!

Props to Dave - he wasn't here man :-)

The old fashioned way to check that is by clamping off the hose to the booster with pinching jaws vice grip with the engine running. You can also pull the hose off at the booster and block off the hose with your thumb. Often you can smell the burning brake fluid in the exhaust.

My brake booster has a vacuum leak. My fuel economy dropped from 24mpg to 18.5mpg according to the carputer, and I only have about half of my brake assist. Nissan decided to cram the sumgun way up under the windshield cowling, so it's gonna be a bear to replace! Now that I think about it, I have a power steering leak too, no steering sauce = no steering assist. Hm. I'm driving a 2004 car from the 80s. Power windows, no power driver assists. 🤣🤣🤣🤣

Where you been?

Notification SQUAD!! Have a great weekend!🔥🔥🔥

Incredible!!! Who da thunk!

MMMmmmmmm K-Series goodness

The only thing lacking in this video is Dave telling us his story. Come on, buddy, you can do it!

Sort of the same thing (not really), this reminded me of the CFI Ford Tempo. They would stall on take off after a stop. Fix was,,,,,,adjust the rear brakes. They ran lean and the booster would cause an extreme lean condition when the pedal was released, especially if the throttle was opened quick. Adjusting the rear brakes reduced pwdal travel and problem solved. Hard part was explaining to the customer what the fault was, lol.

You're amazing...

The fastest repair Ray has ever done?

@johnt.848

4 ай бұрын

*Dave

my mechanic can't find stuff like that; I just wind up getting a new everything.

Dave👍

Thanks..... I am trying to solve/troubleshot this P0171 on our 2010 CRV too....... I cleaned the MAF and replaced Purge Valve. I have not found any Vacuum Leaks.. I was going try Adjusting the Valves next...... I will recheck for Vac Leaks especially around the Brake Booster. The other part(s) to check for this code is the Fuel Pump/Fuel Regulator and Fuel Injectors.

@Westcoastride

4 ай бұрын

In my limited experience I found that simply cleaning a failing MAF with some CRC cleaner may not correct the fact that the MAF simply is reading wrong and needs replacement. It could still be the MAF. All I am saying.

@johnt.848

4 ай бұрын

Before pulling the brake booster off the vehicle, spray soapy water on it while the engine is running. Any leak should show or be heard.

@MrCuckoobox

4 ай бұрын

@@Westcoastride Thanks..... I hear you. And you may be correct... I have cleaned all of our BMW MAFs without replacing them. I suppose that is from using K&N Air Filters. I stopping using them, I use Washable "Drop Ins" Air Filters, that do not use Oil, usually made of Acrylic Fibers. The CRV only has 65k on it. I have changed the air filter twice since we have owned it. It may be a dirty injector? I have been running some Seafoam and B12-Berryman and Premium gas. The Check Engine Light went off when I was running an errand this evening. Let's see if it stays off.

@MrCuckoobox

4 ай бұрын

@@johnt.848 Thanks. I will give that a try. The light came off this evening, but who knows if it will stay off. Adjusting the Valves was next, which I may do anyway.

@brettemerich3237

4 ай бұрын

Check to see if the mass airflow is out of parameters Clean it first