Mazda 6, huge exhaust pressure but the DPF is clear ?

[@Middlestepofficial]

One of the best mechanics that explains great and has amazing experience and knowledge. Thank you tons for maintaining the channel and providing us with such valuable information. I'm not a mechanic but a scientist in computer science. When I was a teenager, my mother signed me up to attend a mechanic garage where she used to work in the kitchen to learn how to repair vehicles. The mechanics there didn't want to say sh** and they were intentionally hiding their knowledge no matter how much I was asking questions. But you sir are truly honorable and I have learned so much by watching your videos in a short time! God bless!

[@kennedysgarage3281]

Thank you so very much. I believe if we all share our individual knowledge and experiences in the trade, then hopefully life might just get that little bit easier 😉🙏🙏

[@raywalsh5822]

You did great peter and always great to watch

[@kennedysgarage3281]

Once I got it going right Ray, I’m happy & hopefully it might help out someone someday . Thanks mate 🙏🙏

[@paulmacklin4201]

Excellent stuff.

[@kennedysgarage3281]

Thanks Paul, this was an interesting one & the first time I’ve come across this big back pressure on one of these. It can be amazing how slightly different failures can create such different outcomes 🙏🙏

[@richardmcwhirter9396]

Great stuff again Peter,very interesting and well explained 👌

[@kennedysgarage3281]

I have a job understanding them myself so I’m happy you could 🤷🏼‍♂️🤷🏼‍♂️ They are fairly complicated nowadays Richard, but we got there in the end 💪💪

[@damienkearns9922]

Peter I couldn’t but laugh at 20:12 ….what a familiar view…engine out and on the floor 😂 The magic of video editing…you really were determined to find the issue and you did everything you possibly could to save the customer more cost…I’d have to ask….if the turbo was changed 12 months earlier by a dealer would a new one not have been fitted and how on Earth in 12 months could that level of breakage occur? An extremely interesting video Peter and I’ll have to go back over it a few times to fully understand the air flow systems on those turbos….so much to potentially go wrong… Thanks a million for taking the time to give such an extensive explanation 👍🏻

[@kennedysgarage3281]

Where it all started was, I’d ran really bad an rattle like heck. I called air starvation due to manifold clogged & rattle due to camshaft & oil strainer blocked. But after that it still didn’t run right. The injectors were leaking & caused the strainer to block & starved the turbo of oil, causing the failure & no warranty. Ooh the joys of it all Damien 😬😬😬

[@peterarries7879]

Nice approach and fix Pete 👍🏻 👌

[@kennedysgarage3281]

Thanks Peter, hopefully you enjoyed it 😉🙏🙏

[@deisediagnostics629]

Brilliant video dude 👍👏

[@kennedysgarage3281]

Thanks Alan, didn’t think you’d watch since you got the job of changing the turbo 😬😂😂😂 Well done to you man 🙏🙏

[@danthecarman8440]

What a complex set up. I admire you for taking the job on. I had a Jaguar xe 2.0 diesel with no power at all. The exhaust had 30 psi of back pressure but the differential pressure sensor only 10 kpa on live data. What i found was a broken dpf that blocked the scr cataylist. So what i learnt was if the exhaust is blocked further down the differential pressure won't read it.

[@kennedysgarage3281]

That is correct, there is no difference in pressure. Both pipes see pressure rise together. Exhaust throttles can cause this same problem. And people will say that the scantool tells us what’s wrong 😂😂😂

[@RobertsChannell]

fascinating ,well done :)

[@kennedysgarage3281]

I’m glad you enjoyed it mate 🙏🙏🙏

[@arsautos9797]

Good video Peter. The airflow in Skyactiv can be complex, but with thought process and a vacuum gauge diagnosis can be quick. Basically it has 5 stages of operation. On startup/warmup there there is no air charging by the small or large turbo, the exhaust gas arrives directly to the DPF to ensure no loss of heat from contacting the turbine. Low engine speeds the charging of the large turbine is minimal but is still present. The small turbine works with the large one in tandem, a lot of people think at low engine speeds it is only the small turbine contributing. There is 3 other modes of operation, for diagnosis it is the first mode of operation that catch out many people. On another note there is a reason why the shaft snapped.

[@kennedysgarage3281]

Great explanation & understanding of the systems 💪💪 I still can figure out how it all works 😂😂 Injector washers were leaking, causing the oil strainer to block. Reducing oil pressure & causing turbo failure with no warranty. Cars eh, I did enjoy this diagnosis though. Thanks for sharing your knowledge 🙏🙏

[@arsautos9797]

@@kennedysgarage3281 No worries but I believe there is another reason for the shaft snapping.

[@kennedysgarage3281]

@@arsautos9797 what are your thoughts?? Other than oil starvation, design flaw 🤔🤔

[@mikeberry304]

And nice to get paid Peter 😂😂, great in depth video/cartoon😂😂👍

[@kennedysgarage3281]

I actually had to stall the owner inorder to record the final bit. So they were standing and watching 😬😬 But it couldn’t leave it out without the final thought 😊 Cheers Mike 🙏🙏

[@bastogne315]

Some investigation Peter...I've seen tv heart surgery that's less complicated. Brilliant stuff❤❤❤

[@kennedysgarage3281]

Some days I’d be wishing I became a doctor, it might be easier 😂😂😂

[@bastogne315]

​@@kennedysgarage3281😂

[@markjohn1523]

Hi Peter, found your channel the other day and I'm super impressed that someone actually works on a sky-active diesel engine!! My problem is that my cx5 sometimes doesn't go into I-stop and it coughs out a massive cloud of smoke from the exhaust when idling. Any ideas? Thanks in advance, Mark.👍

[@kennedysgarage3281]

Hi Mark, it is a broad question to answer without actually seeing the car. The istop doesn’t work is the engine management has any faults stored. So I would recommend giving the car 2 to 3 days driving’s and then do an engine management code scan. The let me what you see

[@markjohn1523]

Thanks for replying, will let you know.👍

[@kennedysgarage3281]

@@markjohn1523 🤞🤞

[@grumblestiltskin1862]

Hi Peter, thanks for the videos! Really informative!! The turbo explanation was great! I’ve got a 2.2d with no boost until 2.5k! No codes! Assumed it was intake, EGR etc blocked so he that all cleaned but made no difference! Any ideas before I keep chucking money at it would be greatly appreciated!!

[@kennedysgarage3281]

The changeover flap on the smaller turbo has fallen off. The pin breaks and damages the smaller turbo charger veins. Remove the battery and undertray, then the air outlet pipe and you should see the problem, I’ll copy and paste a video I think I show it in 🤞🤞

[@kennedysgarage3281]

kzbin.info/www/bejne/jnu9ZHR5Z8d0qsUsi=yITS9kenyyWI9nfc

[@budj7898]

Strainer blocked and low oil pressure to turbo causing it to overheat and fail? Hard to get my head round how these twin turbos work but very interesting to see! Great video

[@kennedysgarage3281]

I thought it explained that, as you said oil strainer caused turbo failure. But loads of others asking me what caused it to fail. So well done Bud for watching the complete video & listening 🙏🙏🙏

[@alexl1820]

Hello Peter. Good video 👍. What can you say about the 2014 mazda 6 2.5 petrol non turbo. I am looking at buying one but if there is a lot of problems with it i maybe search for something else. Thanks again for your good explenation in the video.

[@kennedysgarage3281]

I don’t have any experience with the 2.5 petrol but Generally petrols are better than the diesel & especially non turbo engines. Buy away 👍👍 And I’m glad you enjoyed the video & thank you 🙏🙏

[@paulmacklin4201]

The dpf set up on most cars is hugely complex to comply with emissions requirements. Too often it is poorly engineered and implemented. Coupled with drivers using diesel cars for short journeys when a petrol would be more appropriate. I sold our CX5 just before it developed into a money pit. Turbo was starting to make a bit of noise 😮 and this was after me doing sump and strainer etc etc etc.

[@kennedysgarage3281]

Very true Paul, the injector washers failing causes the oil strainers to block. Trying to get through some of the old comments that i missed while off work 😉👍👍

[@HD2You]

Hello! At the beginning of the video what was the reason to have the lights on for SCBS and the two lights at the left? So I am asking about 3 lights only. Not also for the two from the top.

[@kennedysgarage3281]

The SCBS system give very little trouble but does illuminate due to ‘ invalid data received from Engine control module. ABS & traction control does the same thing. Electronics can act very funny in modern vehicles and engine management faults cause most issues in the 2.2 Skyactive cars. Hopefully this answers your question 🤞🤞

[@farhadelmira1023]

Hi there I am assembling the turbo but there are banjo bolts with holes on both sides except one banjo bolt with smaller hole just one one side,do you possibly know where it should be installed as i didnot mark the banjo bolts as i thought they are all the same Cheers

[@kennedysgarage3281]

Google Kennedys garage Portlaw & contact me tomorrow. I am fitting one in the morning and can verify any pipe work need 👍👍👍

[@101thenuke]

Were the old pipes clear Peter. If that's the 2nd turbo makes you wonder.

[@kennedysgarage3281]

The injector washers failed causing the oil strainer to block. I had this done when changing the camshaft but didn’t know I’d be changing a turbo after that 😬😬😬

[@MallakChannel]

Compared to other cars, where the mazda csn be listed?

[@kennedysgarage3281]

I really like these cars, I know I might be biased but I just think that they are a great car once repaired right. But this just seems an impossible task for most 🤷🏼‍♂️🤷🏼‍♂️🤷🏼‍♂️

[@akaitv6606]

Fixing MAZDA , VW , AUDI will make you rich !!!

[@kennedysgarage3281]

Fixing any brand nowadays will definitely make you busy but I don’t know about rich 😬😬😬

[@moo7137]

Fixing Mazda will first give you grey hair, then you will go bold, then you will be taken to institution in straight jacket 🤣🤣🤣🤣🤣🤣

[@kennedysgarage3281]

@@moo7137 the hair is getting thinner already & soon it will be the straight jacket 😬😂😂😂😂

[@pulkitsharma9916]

Hey Peter, My Mazda 6 2.2 throwing p2262 changed exhaust pressure sensor and pipe and giving turbocharger compressor inlet pressure sensor A reading >104 kpa on 0 - 104kpa. Please help what it could be. Car not very sluggish but sometimes EML light comes up and go away randomly.

[@kennedysgarage3281]

I have just responded to your message on Instagram 👍

[@barrycoleman4686]

Top video Peter. Theyre just pure rubbish them mazdas.

[@kennedysgarage3281]

I actually like them Barry. Someone said to me recently that I’m either brilliant or mad. And I’m definitely not brilliant 😬😂😂😂

[@michaelcoughlan1123]

So interesting. Nice to prove that the shaft was broken.

[@kennedysgarage3281]

It’s kinda crazy that the engine and turbo needs to be removed just to prove the fact that it is broken. Thanks for watching Michael 🙏🙏

[@akaitv6606]

Interesting how that turbo shaft cracked

[@kennedysgarage3281]

Isn’t it mad and all down to oil starvation. Cars who’d have em 🤷🏼‍♂️🤷🏼‍♂️🤷🏼‍♂️

[@sandyande]

Good find Peter real head scratcher

[@kennedysgarage3281]

Hey Sandy, I was a bit puzzled at the start. And it took a bit of figuring out to know what was wrong. But we got there eventually 😬🙏🙏

[@Joey-vtec]

Have you ever had the problem with them blowing injectors, I’ve swapped 3 injectors and it runs fine for a few minutes and then blows another injector again, not the same injector every time tho, any help would be appreciated..thanks

[@kennedysgarage3281]

The injectors in these can temperamental. I’m assuming that you are only fitting 2nd hand injectors. I have on several occasions been pulling my hair out while swoping out 1 or 2 injectors or all 4 using 2nd hand ones. The best advice I can give is fit 4 brand new injectors and you problem will be gone. Are you sure it is an injector fault??

[@Joey-vtec]

@@kennedysgarage3281 yeah exactly that, just swapping in a second hand injector when one goes. I’m not a 100% sure but it’s an injector open circuit fault when it goes, had that on 1, 2 and 3 so far..and when l swap it out for a 2nd hand one, recode it and it will run for 10 or 20 mins and then blow one again 😅

[@kennedysgarage3281]

@@Joey-vtec it can be really expensive but 4 new ones with OE washers would be the best solution 😬😬

[@Joey-vtec]

@@kennedysgarage3281 that’s what I was trying to avoid 😅 looks like that’s the route to go down tho. Thanks for your help and thanks for the great videos you put out, have done a few jobs I never would have been able to do without them 🤙

[@kennedysgarage3281]

@@Joey-vtec cheers Joey 🍻🍻

[@jatinderbaddon6386]

Where u based

[@kennedysgarage3281]

We are in Waterford in Southern Ireland

[@aajules]

must admit i thought there's no way the shaft was split and it was that control flap... never seen that particular issue before.... learning as we go... good one

[@kennedysgarage3281]

Isn’t it crackers what we find on a weekly basis. Broken clean in 2 halves. This was a bit tough to prove before removing it, so a little bit of a gamble but it worked out, thank goodness 😅 😅

[@the_retired_mechanic]

You think Mazda are designing this system like this to get around other manufacturers copyright. Seem a awfully complex design and a re invention of the wheel.

[@kennedysgarage3281]

I actually wouldn’t know enough to say Chris but it is a very complex design. There must be some crazy logic behind it. Some Billygoat in a suit probably knows the answer. I sure as hell don’t 😬😂😂😂😂

[@jamesward5721]

"Poor mans" version - leave the bypass open & ignore the ickle turbo being knackered. :-) It'll whinge but work. Greta may not be best pleased but meh... Turbo restrictor flap kaput on a Suzuki yesterday. Replacement was spendy for the part (Suzuki parts are nuts)... Bogger solution = tie it wide open & drive on. ECU is none the wiser as its able to "command" the restrictor (even if nothing happens as it's borked plus physically disconnected.) Computer doesn't say no - for once, because what it doesn't see doesn't worry it. .It just needs to feel in charge - once it does, it's happy.

[@kennedysgarage3281]

I had sold quite a lot of work on this car prior to realising that it needed a turbo, so it had to be kinda right. Every day has something new to teach us James 🤷🏼‍♂️🤷🏼‍♂️

[@raywalsh5822]

it didnt last long 12 month more i see of these diesel mazdas more i dont like em money pits

[@bastogne315]

would it have been covered under warranty????

[@kennedysgarage3281]

Injector washers were leaking & caused the oil strainer to block, oil starvation caused the turbo to fail & no warranty. But the issue was that I didn’t notice the turbo gone on my initial assessment 😬😬😬

[@mrbmahony]

Worst car i have ever owned The Mazda cx5

[@kennedysgarage3281]

They aren’t actually too bad but a lot of people cannot fix them. This in turn makes the owner and the mechanic hate them 😬😬👍