How to test for a restricted exhaust using the DPFE sensor on a Ford

[@ljchrzan]

Had one of these today on a 97 Thunderbird. Came in with some EGR codes, low power, and a wicked noise. Found one of the EGR DPFE hoses missing. Replaced it and retested. Had a similar noise but not as loud. The small diameter EGR pipe fitting was broken from the EGR pipe and the EGR valve was wicked hot. At this point I hooked up my pressure gauge to the EGR DPFE hose to check the exhaust backpressure. My pressure gauge literally shot off the car when I started it. At this point I removed the O2 sensors and used a borescope to find one catalytic converter completely melted inside.

[@monzsterman]

Oh my gosh a vacuum pressure gauge! What ancient civilization did you get that from. Just kidding. That's old school stuff there but you can never forget to start with the basics. Nice video!

[@metal1999]

great simple video simple check straight to the point no waffle Thank you

[@TaxPayingContributor]

That squeal!!! I got the same sound and thought it was a camshaft bearing. My DPFE tubes popped off and when replaced, they burnt off. I'm going to open the O2 holes first to see if it is clogged cat. But that sound!? Where would it be venting?

[@syedimranshah4721]

I would like to add some information with respect to backpressure testing. Infact it would be helpful to distinguish between psia (absolute) and psig (gauge) whenever we talk of pressure. What these pressure gauges show is actually psig, it means its the pressure above atmospheric pressure. If the backpressure is 2 psi (infact 2 psig) then it is equal to 14.7psi+2psig = 16.7psia. If we don't specify psig or psia, then it can be confusing because 2 psia is vacuum and 2 psig is positive pressure.

[@automaintenancesupplyalfon7022]

ScannerDanner thank you so much for your videos and time i have been a big fan of your videos I hope to meet you one day

[@nickayivor8432]

My Mentor Sir ScannerDanner 👍 started to finish and loved it PRODIGY Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧 ⏰️ 21:49pm

[@timowallin8020]

Great video again Paul! I Would like to see those sensor on Finnish cars too with petrol engines, just havent had that luck yet on it.. So drilling is still quickest way to get result as oxygen sensor ar allways rusted in and leaving them out of the loop may make little different results.

[@942doc1]

How'd u plug it after? Just thread a bolt in or something?

[@timowallin8020]

@@942doc1 Rivet nut and bolt. If those cant seal it then, i just weld it. But the bolt with copper washer is the best as you can easier retest it, if needed.

[@realtormail1]

great videos, i just bought this same gauge on amazon, but it says vacuum/fuel pressure gauge...it has 0-30 psi for vacuum and 0-10psi for fuel( the part you were just using to monitor the dpfe was the fuel side)....my question is why did it not go on the vacuum side of the gauge? why did it use the fuel pressure side that is ment for carburetors? thanks ive been watching other back flow videos using the same gauge and everytime it always showed readings on the vacuum side of gauge...

[@oscarsmith6519]

Thanks. I needed this too.

[@bentech8887]

good video, def something to take note in the future for diagnostics.

[@autismion]

thanks, I thought I'd have to drill a hole in the exhaust of my ohv mazda b4000 or take it to a mechanic what's between the ref and the hi side? is the hi side closer to the intake manifold/egr valve?

[@jasonparris1785]

Thanks man good video. Quick and easy test. My boss needs to watch this he make you pull down the exhaust... Waste of time, but I'm not the boss.

[@ScannerDanner]

Jason Parris watch this one too kzbin.info/www/bejne/gpLJp2WZaditkLs

[@thesnap6376]

+ScannerDanner Hey quick question, is there anyway to check the back pressure without the DPFE valve?

[@SteveRobReviews]

Nice 👍 Paul the swing on that needle at idle going up an down, I had a Silverado last week doing the same thing on a fuel pressure gauge, well I thought the gauge might be chooched so I hooked up another one and same thing , would swing from 45-55 psi at idle. Took me a while but I remembered a question I asked you years ago about how could the fuel boil in the rail , well I let the truck cool down and the gauge was steady as a rock at 52 psi. Never seen this before but it was real hot out and the truck was real hot too. Thanks.....

[@ScannerDanner]

Steve Rob crazy, never thought of the fuel boiling causing those psi impulses you described.

[@DENicholsAutoBravado]

Steve Rob Would the fuel boiling make the car also go rich?

[@DENicholsAutoBravado]

Steve Rob Was there a fix for this issue or just a side note for data that may have distracted you from the real goal?

[@SteveRobReviews]

Customer concern- rough idle only , runs great otherwise. No CEL , no out of range data pids. Plugs and wires recently changes. I smoked the engine no leaks. I cleaned the injectors thru the rail with a pressure canister- no change. Put fuel gauge on and got erratic needle swing. Let sit 1 hour and needle was now steady to do a injector balance test- each dropped to 42 psi. After all this I get a pair of pliers and pinch the pcv line and the engine smooths out . Two things noticed the pcv did make a high pitched rattling sound and it was a 2057 , wrong pcv only good for up to 2000 trucks - this truck was a 2002. All fixed now and runs great. BTW I did hear the high pitched rattle from the start but it sounded like it was coming from the hydro boost. I wish in hindsight I scoped the pump wave form during the erratic gauge readings but it was super hot out so I decided it was Miller time instead :)

[@ScannerDanner]

I'll drink to that :)

[@jasont1917]

You are the man. Very good information.

[@joshuawilliams6937]

Hi mr Paul love your videos !! I have a question I don’t know if you will see this but if you do I have a 5.4 triton with both banks Rich I’ve replaced a bunch of things and still can’t get the fuel trims back up they are at -28 long term any suggestions thank you

[@nasernesheiwat6459]

So from your video / test was your DPFE sensor BAD? Or cats plugged?

[@kenssalvador7253]

How should the gauge behaving if the system was good

[@edb3654]

If you voltage test dpfe signal koeo at the pcm (just the signal pin 65) from positive to battery - is voltage suppose to

[@ScannerDanner]

How are you connecting your voltmeter? Negative lead to battery ground is how you should be testing it. What is your voltage reading at the sensor and at the computer pin?

[@edb3654]

@@ScannerDanner yes sir that’s exactly how it tested it on the voltmeter. From battery ground on the meter (-) and positive on (+) pin 65 straight out was 5.12v from connector and from vehicle ground it was 5.05v Can’t run her cause she will stall and when I check inputs I do get communication issues such as turn key off and on

[@ScannerDanner]

@@edb3654 what is your signal voltage measured at the sensor with it plugged in and backprobing? 5v on the signal circuit is normal open circuit voltage (bias voltage)

[@paulmeehan1978]

Not related to this video but on injector testing how would you go about testing diesel injectors on a common rail diesel system . I dont know what to look for as normal readings. Thanks again for the work you do on your channel it is the best shot in the arm i have gotten to be a better tech in a long time.

[@ScannerDanner]

Paul Meehan not sure man, never tested one. hopefully soon I'll be playing around with some diesel systems.

[@grzegorz16100]

ScannerDanner I hope so!:)

[@scoobyscrappy6601]

Gregory May w

[@billnaire5220]

Diesel pressure is quite high, never tested it with a guage but a scan tool does a good job.

[@billnaire5220]

Diesel pressure is quite high, never tested it with a guage but a scan tool does a good job.

[@michaelcox2648]

Hi scannerdanner. Love your videos. Need some advice please. I've got a vauxhall zafira b 1.6 petrol 2008. I've got p0171 lean code. No vacuum leaks, done smoke test. Checked all fuel system, perfect. Changed stuck open evap purge valve. No exhaust leaks. Both 02 sensors perfect. Change electronic accelerator pedal and new throttle body. Changes intake air temperature sensor. I changed the cat converter about a year ago. Changed map sensor because scan tool was reading 7.5in hg at idle. Done vacuum test. Getting 22 in hg. Done snap throttle test, goes down then up to 25 and quickly settles at 22 in hg again in the green area. With steady acceleration goes to 25in hg. Dont know if this is normal. This problem started 3 months ago when I replaced a stuck open thermostat. Changed the egr valve. Had several machanics look at it. They just took the money and left. All parts I replace were genuine parts from vauxhall. I've ran out of ideas. Please help 😭

[@ericgraz6089]

Great video man, cant wait for the next!!

[@techreview13]

hi danner just wanna ask what engine hood light do you use when working thanks

[@alanv3379]

Excellent video. Thank you.GOD BLESS

[@brianwurks]

Sweet added to the arsenal thanks ScannerDanner

[@paulmeehan1978]

Thanks for the response, keep up the good work.

[@sidahmedsidahmed9285]

Thank you very much

[@diesalweasel]

Hi do you happen to have a link for your gauge your using. best regards james Love the videos

[@ScannerDanner]

You're looking for a garage to bring your car too? Are you in the Pittsburgh Pa area?

[@diesalweasel]

@@ScannerDanner hi many thanks for your reply. I live in United Kingdom. . I want to know where can i obtain a pressure guage from like the one your using in your video as i want to learn about dpf ect so i was wounding do you have a an ebay link or amazon link for the guage your using. If that makes sence. Regards james

[@ScannerDanner]

@@diesalweasel ah gauge not garage lol, sorry www.aeswave.com/ScannerDanner-c512/ www.amazon.com/shop/scannerdanner My tool links. Remember that a DPFE sensor on a gasoline engine is in no way related to the diesel particulate filters (DPF) on diesel engines. I believe you guys have a primarily diesel market.

[@DJDevon3]

Without DPFE you'd have to make your own O2 sensor bung to vacuum port adapter right? That would probably get really hot really quick. I know I've seen you cover that in another video somewhere. It could be helpful to link to that video from this one to extend to people who do not have a DPFE. It's certainly not easy to access and tee into most EGR's. What do you think about using a temp gun to measure before/after cat?

[@ScannerDanner]

***** It would but I've done it and it works. I take an old O2 and punch it out and saw off the ends, then adapt my gauge to it. Did you mean this one? kzbin.info/www/bejne/gpLJp2WZaditkLs A temp gun to find a restricted cat? I've never tried it and I do not think it would be a 100% accurate test like this one.

[@DENicholsAutoBravado]

ScannerDanner I've heard of the tests and tried the tests with a temp gauge to verify good or bad catalytic converters. Scanner data works so much better. Nothing I did with a temperature gauge on my old or new cat actually matched any prescribed tests.

[@AhmedAlMenhali-ze3ci]

Please I need help with ack of air meter for car

[@vics7476]

Thanks paul for this video. I have requested you. And thanks for solving.

[@christopherdarrough2667]

Would plugged cat cause those hoses to blow off got a 96 f150 keep getting a p0402 I can clear it and a week later it's back I had to put a wire tie on the hose to keep it on the dpfe also i replaced the dpfe engine runs good just feels kind of sluggish i just rebuilt it so it shouldn't feel like that

[@ScannerDanner]

Yes, absolutely!

[@christopherdarrough2667]

@@ScannerDanner well just hooked a vacuum gauge up to the dpfe and it stays at 0 i had my dad hold his hand over the tailpipe and it shot up then he pulled it off and it went to 0 again guess it's a messed up egr I just put a new dpfe on it so I know that ain't it

[@ScannerDanner]

@@christopherdarrough2667 that test needs to be done at 3000 rpm (no more than 2 psi)

[@joejoe1982able]

Have you ever worked on any jaguars, 02 and up

[@ScannerDanner]

unfortunately :-)

[@MrJohnnyDistortion]

First, I thought to myself, that thing is gonna hatch like an egg. Then, I remembered that it was a Ford and I thought, that's a pretty smooth runnin' Ford.

[@diamondstateautodiagnostic5250]

Does the Dpfe tube run to same spot are does one go to one cat and the other to the other downstream cat. What's the point of them

[@ScannerDanner]

master tech cody It ran to the passenger side exhaust manifold on this particular truck. It provides exhaust gas for the EGR system and the DPFE sensor is used to monitor flow.

[@diamondstateautodiagnostic5250]

ScannerDanner you said there's three cats on that truck so if it only runs to the passenger side does all the cats connected together after these tubes I guess that would be the only way to test all 3 cats with one tube on one side .

[@tocsa120ls]

Great video! Are these numbers also valid in the case of a diesel engine?

[@ScannerDanner]

tocsa120ls I don't know. I do not work on any diesel systems. Maybe someone else can jump in here for me.

[@oroscriss1608]

premium channel not available in my country :(

[@ScannerDanner]

Oros Criss I have people using a VPN with success in unlisted countries. Sorry, I wish I had control of this but I do not. Thanks!

[@bobmaslen8983]

I have a 2004 cobra that has less than 1 psi at 2000 rpm but when they did a dyno run and checked back pressure at 6400 rpm it was 19 psi? Is this because the cobra have a stock supercharger or something else. Nobody can give me an explaination why the 19 psi is there. Thanks Bob

[@ScannerDanner]

under load backpressure measurements are completely different than this test. Think about how much throttle opening it actually takes to run an engine at 3000 RPM in park (it's not much). Compared to a WOT run at redline. Huge difference

[@bobmaslen8983]

Will the backpressure of 19 psi hurt the engine it made 442 lb of torque and 395 RWH. I just got the car and do not want to damage the engine on it. I really enjoy your video you keep thing simple when explaining things.

[@diycolombianitoloco9375]

hey scanner danner im interested to join u guys to start from (0) im not an mechanic but all few things that i have learn its been throught your videos on youtube and right now i feel ready to start to learn the right way but i want to start from zero soo can you explain to me how join u how get the book and be part of your clases thanks !!!

[@ScannerDanner]

Don't worry about the book yet. You can sign up for ScannerDanner Premium here www.scannerdanner.com/join-scannerdanner-premium.html Make sure you watch the introduction and navigation video for where to start. You do not need the book to start but that can be purchased on my website as well. Thanks so much! I look forward to hearing from you in the comments section of the Premium videos!

[@arctican7483]

GOLD!

[@sameerwarrich26]

very nice video, Thanks

[@geojor]

valuable videos, thank you...

[@wtbm123]

Good video

[@abdullahfaraj9931]

You Tube add new countries for premium channel please !? I'd like to understand the system !?

[@ScannerDanner]

Abdullah Faraj I have people using a VPN to access it. Hope that helps. Thanks!

[@leorobles2456]

Hey scannerdanner can you make a video about BUS commutation problems

[@michaelbezbor1354]

Question to auto mechanics (diesel) pdf poured through the pressure valve tube that goes to the filter, connects the garden pump, poured the stove cleaner, detergent for the pump, and diluted the CLR. IT HAS RECEIVED 2 LITERS OF THE MIXTURE

[@cantwaitkid]

That squeal sounds like a camshaft position sensor synchronizer.

[@ScannerDanner]

Could have been. Don't remember

[@ozzstars_cars]

thumbs up

[@rrmech11]

Kewl. Danner

[@estrelladelnorte1308]

ok , so the rule is no more than 2psi at 3000 rpm in park, THANKS!

[@ScannerDanner]

you got it and on a good car it will hover around 0

[@thedrivewayman3833]

He failed to mention this is only checking back pressure on two of the three cats

[@ScannerDanner]

no, I mentioned exactly what this was an was not testing @ 4:15. The main point of this video was showing a quick test for exhaust restrictions.

[@thedrivewayman3833]

ScannerDanner I stand corrected I think you for the reply

[@jesseruiz2337]

that egine has a lot of hoses lol

[@Ashroyer86]

That's a ford for you.

[@BBS_Robski]

First lol