Restricted, Clogged, Plugged Exhaust System Quick Test

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Restricted, Clogged, Plugged Exhaust System Quick Test

Рет қаралды 56,925

Күн бұрын

This is one of many ways to identify a restricted exhaust system that is causing a low power condition. Here is a list of other case studies I've shown with varying testing methods:
• How to test for a rest...
• O2 sensor (fixed lean)...
• How to test for a rest...
• How to test for a plug... (picoscope and psi tranducer part 1)
• How to test for a plug... (picoscope and psi tranducer part 2)
• Exhaust Backpressure T...
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdan... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC 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 ScannerDanner LLC, 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 in this video is the sole responsibility of the user and not ScannerDanner LLC.

Пікірлер: 132

@mike-yp1uk Жыл бұрын

Often imitated never duplicated the Scanner Danner program of diagnostics. I love working on cars but I'm forced to constantly study cars and systems daily just to be able to fix them right. The premium channel took my career to a whole new level.

@chasyho Жыл бұрын

You're really good at explaining concepts, has anyone ever told you that you should be an instructor😉😉...LOL🤣🤣LOVE the content, 19 years old and learning everyday on the premium channel. Crazy how the video content is endless, and you couldn't even find a weekend class to sit through for the cost of ScannerDanner premium for a year!

@ScannerDanner Жыл бұрын

So glad to hear this from a young man starting out, who is hungry for knowledge! You WILL be successful using my material and you know why? Because you want it! Can't wait to see what you do with it my new friend.

@JasonLee-lv7tm 5 ай бұрын

Your good at kissing strangers butts

@mike-yp1uk Жыл бұрын

Some people go to school and get into the field only to discover the education retention left them un prepared because we forget what we don't use. I find the premium channel allows me to constantly revisit material and something always gets burned into memory but I've used the premium channel for years. It's my best tool.

@ScannerDanner Жыл бұрын

You guys that have been following me over the past 11 years know this test! Here is a list of some of the other restricted exhaust videos I've done: (check out the Picoscope ones if you get a chance!) This is one of many ways to identify a restricted exhaust system that is causing a low power condition. Here is a list of other case studies I've shown with varying testing methods: kzfaq.info/get/bejne/gK-Fa81lvqi-qKs.html kzfaq.info/get/bejne/i9GpgJR9xN7GkYk.html kzfaq.info/get/bejne/b7qcrMp7st64oKc.html kzfaq.info/get/bejne/obVpZNZhqNWxj2g.html (picoscope and psi tranducer part 1) kzfaq.info/get/bejne/j9Wfnrll39-1lIk.html (picoscope and psi tranducer part 2) kzfaq.info/get/bejne/gseWqZWUmdneio0.html

@onemechca Жыл бұрын

Love your quick and dirty tests Paul. Extremely easy to do and most important....very informative....keep it up bro..

@billmonroe8826 Жыл бұрын

Short, sweet, and to the point. Now enjoy the weekend. 🙂

@dznuttzonyachin7499 Жыл бұрын

That's what she said 😂

@ScannerDanner Жыл бұрын

🤣 that was a reach on that one, but definitely one of my favorite quotes too lol

@volts2twelve239 Жыл бұрын

Thank you sir danner.your videos is at good timing for me. Because tomorrow im working for ford flex and the problem is related to exhaust catalytic converter restricted.your videos sir is helping me a lot.im a filipino working here in middle east.

@wyattoneable Жыл бұрын

You're still teaching and I'm still learning and enjoying the content. It was cool to see JP over at the shop on your Facebook post.

@theadventuresofjavier8698 Жыл бұрын

✋🏼

@wyattoneable Жыл бұрын

@@theadventuresofjavier8698 Hello my friend.

@BigDogDiagnostics Жыл бұрын

Quick down n not getting dirty testing! Love it, thanks for all your videos! You have made such a great impact on this industry! Keep up the good work my friend!

@SchrodingersBox Жыл бұрын

It never comes through very well on the video but I describe clogged exhaust as a “muffled” sound. It’s pretty unmistakable. I remember a car with a clogged cat that had the EGR valve right by the throttle cable and when I tweaked the throttle by hand to increase RPM, the exhaust escaping from the EGR valve struck my hand and burned it so bad it caused an immediate blister that swelled almost the size of a tangerine!

@Joserocha-wm9de Жыл бұрын

The garage ( people ) that did work on that car needs to watch @ScannerDanner videos 🙄😂 Great job 👌

@ScannerDanner Жыл бұрын

Yes they do

@ljchrzan Жыл бұрын

I once did a backpressure test like this on a Thunderbird 3.8. The backpressure shot my gauge off the DPFE pipe! The owner said it had been running bad and then would barely move around the parking lot.

@TheFurious74 Жыл бұрын

Never heard about that sensor especially on gas engine.. Thanks for the info

@theadventuresofjavier8698 Жыл бұрын

Always love your videos Paul.

@jimkillen1065 Жыл бұрын

Thanks for the videos . I was a mechanic for Gm a long time ago . A customer pulled there car in said the car was running fine a apparently they were driving in the rain and thr car started running badly and loss of power. The exhaust as you said hissing at high rpm . The rain had caused the pipe to collapse..

@ScannerDanner Жыл бұрын

How strange! Thanks for sharing!

@AntonioClaudioMichael Жыл бұрын

I wouldn't doubt the old cat is in the muffler nice quick checks

@mike-yp1uk Жыл бұрын

Great video this car will need a follow up diagnostic to see if there is something creating premature break down of the cat.

@vinces8974 Жыл бұрын

That car was really constipated lol,another great video Thankyou

@ScannerDanner Жыл бұрын

🤣 yes it was

@kinglangren Жыл бұрын

Yeah my nephews car had the same problem and sounded the same. I told him 6 months ago to fix his misfire and buy some a couple of coils . He never did now he’s got a bad cat.

@youutartur1104 Жыл бұрын

What can you expect in fuel trims or oxygen sensor values when you have a plugged exhaust? Any other PID that jumps out at you when you have this issue? Longtime premium subscriber here. Thank you for your work

@ScannerDanner Жыл бұрын

Thank you so much! This is a variable situation as you can have a plugged cat on a dual bank system with two cats where it's only affecting one side. Or you can have a single cat affecting both banks. Then MAP vs MAF systems adds another variable. I guess in general, I'm not using fuel trim to help me ID these.

@tracydiller9378 Жыл бұрын

Great easy Diag. on a restricted exhaust Paul,Great Job.Until next time God Bless.

@carlm2590 Жыл бұрын

Professor Danner, keep making these videos 👍

@danman9017 Жыл бұрын

what i do when the muffler is clough is disconect it and put a tire bead blower tank in the tail pipe and blow all the part out and that really work, but be carefull those part come out like a canon .tks good video

@ScannerDanner Жыл бұрын

Good tip! Seriously never thought of that. I think depending on the muffler design though, you may not get it back out

@ice44567 Жыл бұрын

These Tauri/Sable for some reason actually had three catalytic converters, one downstream for each bank, and then a third one downstream of where the exhaust connects. The third cat is always where all the debris will collect, not the muffler. The third cat isn't even monitored, so it's kind of strange that it's even there...

@heyitschinoable Жыл бұрын

Only primary ones are monitored by the secondary O2 sensors. If secondary O2’s say the primary cats are good than more than likely the 3rd cat is ok as well. Generally..

@hotrodpaully1 Жыл бұрын

You see that a lot on California emissions cars

@throughmylens5127 Жыл бұрын

Seen some crazy things like a glass pack muffler came apart and plugged exhaust pipe

@TedTedness-wu4vb Жыл бұрын

Dan, please do a video where we can find as DIY car guys, "top tier" private diagnostic guys like yourself. I live in Minneapolis, where can I find top tier guys?

@theadventuresofjavier8698 Жыл бұрын

Customer complaint “ITS STILL A FORD TAURUS!”

@ScannerDanner Жыл бұрын

haha right?

@mph5896 Жыл бұрын

Ha. I actually liked those cars. Mainly because you could buy them for close to nothing. Government contract on them was $12k for a new car in 2005. That's why so many fleets bought them 3.0l ohv engine was solid.

@walideamine9540 Жыл бұрын

Hi I hope to do a video about all tools we need thank you so much

@whitetiger8652 Жыл бұрын

Appreciate the video Paul.

@donaldisrael7147 Жыл бұрын

Back in the olden days when I first started my shop, the owner of a mid 70's Buick thought I was crazy. I was going after his exhaust system with a hacksaw. I found about double wall pipes.

@labrat6910 Жыл бұрын

Thank you Paul.

@scottykilmer3920 Жыл бұрын

This guy is gold ! 😇

@berniceperry8898 Жыл бұрын

Dude a Taurus, a Taurus...lol great videos bud keep them coming....

@mr.technician2638 Жыл бұрын

Hello sir Paul something another interesting video again to gain knowledge....sir I just want to ask, what is the purpose of the 3rd catalytic converter on a 3 way? I noticed on GM trucks and cars their's a 3rd catalytic converter with no monitoring sensor on it...thank you sir god bless

@wagoosh78 Жыл бұрын

could you have used the vacuum gage on map sensor line compared idle vacumm to 3000 rpm reading got the same results on intake manifold pressure change old school way ?

@ScannerDanner Жыл бұрын

You can, but not the way it was taught and you can still miss it. I had a truck with 4- 5psi of backpressure at 3000 RPM with perfect vacuum at idle and higher RPM

@wagoosh78 Жыл бұрын

@@ScannerDanner glowwing exhaust manifold is a sign of restricted exhaust along with low power too i seen tht when i worked as fleet mechanic on 1995 ford van 5.0 inline 6 engine

@anthonynicholls8010 Жыл бұрын

Great job my friend ✌️✌️

@genesipes8532 Жыл бұрын

I wished I could take my van to you. Been trying to solve my high idle for two years now. Shops just want to throw parts at.

@ScannerDanner Жыл бұрын

vacuum leak is the most common cause of a high idle. Also ECT and TPS inputs need to be looked at real close.

@genesipes8532 Жыл бұрын

@@ScannerDanner one shop wanted to replace the pcm. It does have some weird behavior, like the fuel gauge wobbles back and worth and doesn’t stay steady, and when reading the TPS pid on my blue driver scan tool, the values jump around. Maybe bad ground.

@lolipopdeck3694 Жыл бұрын

Been waiting for the video 👍

@pierrebrunet1529 Жыл бұрын

1,5 psi for gas engine how about diesel with particle filter got any guide pressure

@geoffjohnson357 Жыл бұрын

Bonjour from France. Great vidéos.you often talk of your book cant see it in your shop? How do we get hold of it?

@ScannerDanner Жыл бұрын

On my website at www.scannerdanner.com Thank you!

@sheerwillsurvival2064 Жыл бұрын

Binge watching 😁 great stuff

@ScannerDanner Жыл бұрын

Welcome aboard!

@dimisrambodimisrambo7285 9 ай бұрын

when we say it is acceptable up to 2psi at 3000 rpm does it mean that we have a small plug which does not affect the operation of the car?

@ScannerDanner 9 ай бұрын

No. Some backpressure is normal

@brian2359 Жыл бұрын

Great video!

@deeznutz3494 Жыл бұрын

Do you think this could’ve been diagnosed by monitoring O2 sensor data?

@James-fs4rn Жыл бұрын

👍 thanks for sharing!

@bebeto71-iv4qq 5 ай бұрын

Hey. Paul. Would you use the IAT sensor PID when checking for a restricted exhaust as backpressure would increase causing the sensor to read higher? I have never seen you use it in your diag. Thank you.

@ScannerDanner 5 ай бұрын

Most iat sensors are built into the maf or are located in front of the throttle body and so would not be useful for what you're suggesting. I have used manifold mounted iat sensors to find stuck open EGR valves though

@bebeto71-iv4qq 5 ай бұрын

@@ScannerDanner That makes sense. I only asked you because you are good at what you do. Whatever you say is gold.

@moaidalhriri3686 Жыл бұрын

Thank you 😊 frand

@stefanrampersad7639 Жыл бұрын

It may have an amount of back pressure as well

@roadsidecamper 4 ай бұрын

Hi can back pressure from a plugged exhaust system cause a carburetor on older car to malfunction?

@ScannerDanner 4 ай бұрын

Yeah for sure! I'm assuming it is a feedback carb and you have an oxygen sensor? If you do, remove the O2 and do a backpressure test

@Ken-wu6hr Жыл бұрын

Awhile Back I Had a Kia Or Hyundia Towed in. Customer self Diagnosed it Needed 02 sensor. Listening to his complaint I told him I seriously doubted a 02 will do him any good. his cat was probably plugged. I Asked If You Want me To Dignose your Problem or Install your Part. His wife said Diagnose it. It Actually Flipped my gauge cold. (I have it on video). Of Course I Priced Him a Cat. It was a 4 cyl .I Beleive it was Part of the Manifold. He Came in asked his options. I Had to Imform him either fix it or Park it.

@damnwereinatightspot Жыл бұрын

I liked this one... thanks

@ScannerDanner Жыл бұрын

Glad you liked it. Thanks!

@leyvapcc Жыл бұрын

Hi Paul, I noticed the premium channel is down, I really hope is a temporary thing, I’m looking forward to take the courses.

@ScannerDanner Жыл бұрын

It's back! We were updating the server. Thank you!

@BLACKRAIN390 Жыл бұрын

Are you in Florida?

@luiscruzcedeno8642 Жыл бұрын

Thans for the video cuestion can the catalyst converter cause misfire?

@luiscruzcedeno8642 Жыл бұрын

I have a misfire on my bmw change everything plug coils still the same I keep getting the same code multiple misfires

@ScannerDanner Жыл бұрын

if the cat is restricted, yes it can But cats can fail it two ways: 1. Its oxygen storage capacity is compromised and no longer cleans up things as it should 2. It melts down and becomes a restriction #1 will not cause misfiring or really any driveability problems on most systems

@luiscruzcedeno8642 Жыл бұрын

@@ScannerDanner thanks

@luiscruzcedeno8642 Жыл бұрын

Well thanks for responding i try every plug coils vanus intake everything i can think still missing on number 8 sounds impossible

@Pablo_Automotive Жыл бұрын

Thanks for share another great tip. =)

@patrickdemme Жыл бұрын

Hey Dan I have a 2008 Chevet Cobalt with a starting issue. The car runs and will start. But after I drive my car for a while and shut if off, it won't restart. It takes a day for me to be able to restart it. And that's after I disconnect my negative battery cable and reconect it. I usually leave it off for twenty four hours. Do you have any idea what that might be?

@kenniefernandez Жыл бұрын

Greetings colega

@garrieparsons2265 Жыл бұрын

Can’t find my transmission input speed sensor Nissan sentra 1.8 2013 can you help please 😢

@AT-wl9yq 9 ай бұрын

Go to your local dealer and have parts give you a quote. Ask them to print out the diagram of the part so you can match it up.

@philh9238 Жыл бұрын

You been to any hybrid classes? I been going to the ones around me. Actually not to bad to work on once you see the concepts in person

@ScannerDanner Жыл бұрын

Yes sir!

@philh9238 Жыл бұрын

@@ScannerDanner you going to put any hybrid vehicle series videos out? I had no idea what a megaohmeter was til I seen the juice one of them puts out for a cable leakage test.

@JAYZILLA Жыл бұрын

Hey paul...I was a tech for about 10 years with so much negativity..I quit and now I'm starting over...I purchased your ebook and trying to learn the correct way so I can finalize successful. Any advice you can give sir? BTW I did get most of my ase A3-A8

@ScannerDanner Жыл бұрын

Welcome back! Thank you so much. You are in the right place. Have you checked out my classes yet? Where I'm teaching through the book? Hope to see you there too. This would be where I'd suggest you start.

@JAYZILLA Жыл бұрын

@@ScannerDanner if you asking about premium..no sir not yet but I will join asap

@ScannerDanner Жыл бұрын

@@JAYZILLA looking forward to hearing from you more along the way

@JAYZILLA Жыл бұрын

@@ScannerDanner I'd love to have 5 to 10 minutes with you. Do you do any consultations? Lol

@ScannerDanner Жыл бұрын

@@JAYZILLA no sir, but I do have a forum with over 30k members on it and we can absolutely help you with any car issues you may be having. It's free to join too www.scannerdanner.com

@benjaminrich9396 Жыл бұрын

Useful. 👍

@rodvan-zeller6360 Жыл бұрын

Have you used graphing rpm and maf cranking to pick up plugged exhaust?

@ScannerDanner Жыл бұрын

@rodvan-zeller6360 Жыл бұрын

@@ScannerDanner Thank you for the reply. It would make an interesting project to do a before and after artificially blocking the exhaust

@ScannerDanner Жыл бұрын

@@rodvan-zeller6360 the problem is that partial restrictions exist and cranking speeds and even idle and low rpm is not affected

@rodvan-zeller6360 Жыл бұрын

@@ScannerDanner Thank you for the reply

@ganeshnarayan5505 Жыл бұрын

I was looking for Same information on 97 Toyota camry thank you sharing this video Scannerdanner.

@joseluiszapote2634 Жыл бұрын

Good

@johnasosajr Жыл бұрын

I work in a dealership and I love your stuff man it helps but where I’m conflicted is when I start diagnosing a vehicle if there is a tsb on a car they want you to start there and replace whatever part and if that doesn’t fix it then what cause I’ve seen it and im not a fan of it but what am I supposed to do

@ScannerDanner Жыл бұрын

Not much you can do but listen to them and when the bulletin doesn't fix it, then it's time to shine right?

@johnasosajr Жыл бұрын

@@ScannerDanner yeah I know it is what it is but it’s a little demoralizing that’s all

@ScannerDanner Жыл бұрын

@@johnasosajr play the game brother, then when you prove yourself, they'll start listening to you! I promise

@AT-wl9yq 9 ай бұрын

There's really nothing wrong with that. If the same problem keeps happening over and over, its highly likely that putting out a tsb will fix the issue almost every time. Quite often problems listed on tsb's can be extremely difficult to diagnose. For example, there is an issue with some Infiniti G35's. Its a light tapping metallic noise coming from somewhere in the center of the dash during moderate to heavy acceleration. It turns out that rtv sealant used in the heater core partially breaks off and starts flapping around as the flow of coolant gets stronger with higher rpm's. The fix is to back flush the cooling system, and if that doesn't do it, replace the heater core. How long do you think it took for someone to figure that one out? When I first saw it, I didn't think it was real. I just figured that someone was playing a joke on me. You also have to look at it from the manufacturers point of view. If they know 99% of the time a certain repair will fix the issue, then why would they want to pay the dealer $150-$200 per hour to diag a known problem? Everyone will have a different opinion, but I think its reasonable.

@user-mj9gz8nt1g Жыл бұрын

Класне відео-))))👍👍👍

@Magnuss0724 5 ай бұрын

03 ford explorer experiencing same issue. Replacement is 2000. Is there any other way

@ScannerDanner 5 ай бұрын

Unfortunately no and even more important is that you fix the issue that melted the cat or your going to do it again.

@Magnuss0724 5 ай бұрын

@@ScannerDanner I went to an exhaust mechanic today after work. 1 cat bad 1 good 1 blocked from the bad cat. To replace is 2k to gut the cats. And straightline with resonator pipe. With welding is $400

@ScannerDanner 5 ай бұрын

@@Magnuss0724I'm fine with a straight pipe, but I can't recommend that as it's not legal. Check your fuel trims when your done and make sure they're normal

@Magnuss0724 5 ай бұрын

@@ScannerDanner trust me I understand. I'll be looking for another ride. Cause I just can't keep going like this

@cassandralesh8536 Жыл бұрын

Are you still teaching at that school?

@ScannerDanner Жыл бұрын

I'm still employed at RTC but I'm no longer teaching the day to day classes. I only come in as a guest speaker now and again and as a substitute when needed.

@MichaelPoage666 Жыл бұрын

Lol, "any pieces missing." I had a clogged cat on an Isuzu Rodeo. I cut it out with a Sawzall and by the time I did, the cat was just an empty pipe. So, replacing the catalytic converter didn't solve all my problems, obviously. 😂

@alejandrovelazquez2378 Жыл бұрын

👏🏻👏🏻👏🏻👏🏻

@JxnmadeQDG 5 ай бұрын

Mines does the same thing 😭

@GroundedDiagnostics Жыл бұрын

👍👍

@calholli Жыл бұрын

I live in Oklahoma; on an old junker like this my brothers would just cut the pipes off about a foot after the manifolds and let it scream. lol. Buying cat's on a car this old just feels wrong to me.

@mikeeustice4452 Жыл бұрын

Another quick dirty test is to watch map sensor, it should read the same at idle and higher rpm, if the exhaust is plugged the map will be closer to baro at higher rpm , cant inhale if it can't exhale

@ScannerDanner Жыл бұрын

This test will pass unless the restriction is severe!