This video was taken from a 5 part training series I did for my students on various ways to identify a misfire and restricted exhaust testing. You can find this 5 part series here www.scannerdanner.com/scannerdanner-premium-chapters/misfire-case-studies.html

I have been a mechanic for over 13 years now. I just want to say thank you because your videos have taught me a lot more than what I thought I know. You are a beast and probably one the best diagnostics people out here I would consider. Keep up the good work and we appreciate the videos.

To the guys that are busting my man about his 454 small block, where is your videos on youtube??? G M made a 265, 283, 327, 305, 350, 302, and a 400 small block. But that was before your time. This young man took his time to make a very informative video and you know-it-alls kick him just for your own lack of self respect. Bless your hearts.

Wanted to thank you for your fathers service in Vietnam. Read in the comments . I am very proud of him and the amazing son he raised . God bless you brother

Great video on a simple open. This is the kind of stuff that takes maintenance skills to the next level separating the real wrenches from the parts changers. If you want to be a great mechanic who has families sending everyone they know to you and their kids and so on....Be like Paul Danner. He fixed this cat's ride for a fraction of the cost of the computer swap the guy before him did. This customer will be back again for honest service. Paul, keep up the great work, you are setting the example and helping make a good name for the trade.

I'd use the term 'technician' lightly to describe the other guy. Why is it that customers need to constantly pay for incompetencies and skill inadequacies of service people ? Patient is describing a heartburn sensation? ; lets put him on the heart transplant recipient list. crazy dude, you're a breath of fresh air to the world of automotive diagnostics. Keep it up.

I've always been a nut and bolt kinda guy and would GLADLY pay for anything electrical. I had a p0304 on a GMC Sierra 1500 5.3L so changed injectors then had a connector clip break and replaced it. Only to have it followed by a p0300 random miss. Compression is good but thought there maybe an issue with the way I spliced the connector. Wasnt 100% sure how to test the connector so I found you. Thanks for this so I know how to properly test the wiring. I WAS just gonna unplug it to see if there was a change in the boggy/rough idle or not to tell me if I spliced incorrectly but this is a true way to test. So thank you again for this video friend!

Paul, thanks for showing that, it is good info. Perhaps you should have explained how the injector circuits work, as i think that not many do understand. I'm a Chrysler dealer tech, and the way Chrysler designed their systems, the injectors get 12v all the time, the pcm turns the ground on/off to turn the injectors on/off. I don't know atm how all the other manufacturers design their injector circuits, but wanted to point that out in the event that there are different designs.

ScannerDanner you are the man! Super appreciate your tutorials for the common dude to use basic tools. I was able to use my multi-meter and trouble light to trace a bad #7 open, just by watching your video. Saved myself a boatload!!!! Thank you so much.

THE POST IS PRETTY OLD, BUT I REALLY THANKFUL FOR YOUR DEDICATION SPENDING YOUR TIME AND KNOWLEDGE TO HELP OTHERS. I LEARNED TO DO SOME WORK ON MY CARS BECAUSE OF SOME PEOPLE TO RIP OTHERS

I continue to say it..you rock.. love the way you analyze things.. and at that with simple tools ..thank you for always throwing little freebies every now and then our way ..

Thank you for doing this kinda stuff with the basic tools. I'm still building my Diagnostic Arsenal and watching your videos really showed me how valuable having a Scope and more importantly having the knowledge on how to use it properly can help diagnose problems correctly. But Until I get the ability to buy one. Seeing that there are a lot of good things that can be done with just a plan ole multi meter and Test light is SUPER helpful.

Thank you. I’m not a mechanic or tech not even close. I used your video to learn how to use a multi meter and noid lights and diagnose the injector circuit error code on my Jeep Wangler TJ 4.0L and learn that my injector is good and PCM was good and that the issue was in the harness! So cool! I’m a digital marketer and a marketing director is my day job. So fun working on the Jeep! Thanks doe the video!

Thanks danner for your support and tell James we miss him and his famous test light.

Thank you very much for presenting an evidenced based solution in an affordable, fundamental manner.

Basic tools that helps alot of home mechanics . Wish your book was more flexible and home mechanic friendly. Thanks a million for posting these.

Awesome instructional video, thank you for making it and sharing it. I had just completed the dreaded plenum plate and gasket repair on a Dodge 5.2, along with numerous other repairs and replacements while in there. I had one cracked fuel injector, so I bought a new one to replace it. It was a BWD (Borg Warner). Got everything put back together, and it was running like complete shit, bad idle, wanting do die, missing, etc. The computer finally kicked a code, P0208, which was the same cylinder that had the brand new injector. Found this video doing research, planning for the worst, even a possible broken valve spring. Well I checked the resistance on that injector, and there was none. Brand new, non working injector. Just replaced it and my truck is running the best it has since I've owned it! Lesson to be learned, don't ever count on brand new parts to be in working condition! Anyways, thanks again for the video!

Car fundamentals troubleshooting techniques Very helpful and we all Appreciate your tutorial.

Great video Paul as always. Not being a professional it is really helpful to see these basic tests performed. Thank you for sharing your vast experience and knowledge on this and your premium channel which I have to say offers unbeatable value for money having watched the contents. I never stop learning something new.

Good Afternoon Paul Danner and happy blessed Friday 🙏. I have a (2003 Dodge Caravan SE V6 3.3) and its throwing 2 codes (P1684-Battery Was Disconnected) & (P0201-Injector #1 Control Circuit). I have the 2003 powertrain diagnostic procedures book for the code (P0201-Injector #1 Control Circuit) and I have the 2003 Transmission Diagnostic Procedures book for code (P1684-Battery Was Disconnected.) I have taken action and followed instructions from the book that gives procedures for code (P0201) and i applied Test#1 & Test #2. Im on Test #3 now and these are the instructions..... Turn the ignition off. Disconnect the Fuel Injector harness connector. Remove the ASD Relay from the IPM. Turn the ignition on. Jumper the Fused B+ circuit and the ASD Relay Output circuit in the IPM. Using a 12-volt test light connected to ground, probe the (K342) ASD Relay Output circuit. Does the test light illuminate brightly? Yes➡️➡️➡️ Go To 4 No ➡️➡️➡️ Repair the open in the (K342) ASD Relay Output circuit. Perform POWERTRAIN VERIFICATION TEST VER-5. Im not grasping and understanding these instructions as to where i can apply it and take action doing test steps from the book. Are you able to help me grasp and understand this procedure of Test #3? Test #2 procedure from the book for code (P0201) i applied the procedure and i filmed myself applying it. kzfaq.info/get/bejne/qJ2ooLKlldvJd58.html

Real nice, just a test light and six minutes. Now that was way cool 👍

Best video explaining and true oldschool skills - Respect !

Great video another thing I can add to my arsenal. I thank you I learn something new every time I watch one of your videos.

Thank you sir for all that you do for us 🙏

Thank you, really good tip with hooking up a light to see that there is a signal to the injector!

Great explanation! I have a buzzer that I hook up at the PCM in this situation, often allowing a quick wiggle test to pinpoint the open in the harness in case it's somewhere I can't see the scope/meter. Great work!

As usual, fantastic. I like the idea of troubleshooting using common tools. This is nothing but awsome. Thank you.

Thanks. I learned something today and I hope to implement it in fixing a project car I purchased.

Thank you, you may have just saved me a lot of money. 2010 mercury Milan intermittent misfire. I may have a bad PCU since it seems to work when it's cold and misfire after it warms up. But at least now I know how to check and verify.

I have been watching you first a number of years. Congratulations on the channl. From a guy with a Oscilloscope.

Just goes to show ya..... Question everything and never feel embarrassed or guilty to get a second opinion or even 3rd for that matter. Whether it's your mechanic's diagnosis or your doctor's diagnosis that you're not sure of, get that second opinion. 🤔 Especially if you have your mechanic diagnosis your health or your doctor diagnose your car. 2nd opinion folks!

Warm greetings from Poland. I am watching Your Videos and still learning to fix my 88 pontiac Firebird no injector pulse problem. 12 on power side and 8v on signal side with key on. Thx for very goood videos.

Thank you am a old Radio tec years ago You give me and others A refresh a cost on trouble shooting you Helped me with my 90 Fox body neg trigger ing on the injections Now I have to use led s No load test lights Fiber ocs thanks PA Guy kev in ny

Very informative, just one point, it took me a couple of times watching your test at the engine computer to understand what you were doing. Sometimes us DIY’rs who are still learning need the information fully explained to us , step by step. I finally figured out the test results at the computer, when I broke it down to a simple electrical circuit. Just my 2 cents. Excellent video none the less. You are a great human being, helping the average person to diagnose and fix their own car. God bless.

Thanks for this video, Im going to check my truck like this. Appreciate It!!!

Love the Chief's anchor in the background! Go Navy!

Great video. I have a misfire on my 2013 x5 n55 engine and I just verified that injector 5 was bad by testing each connector, and I got the same .485 volts across each plug with key in on position. I'm going to run the same test on plug 5 with engine on this time and verify against cylinder 1 if the same voltage is coming through. Thank you.

You make it look so easy Paul 👍, excellent tuition

There is no excuse however if the employe of the shop doesn't pushes tech to be professionals and if he grooms them to just be Parts changers then this is what happens a real mechanic knows exactly how things work and knows exactly how to troubleshoot there's a big difference from people who just throw Parts at something and people who actually know what's going on this is one of the reasons why I got out of the trade when I was in the trade there was no respect for people who knew what they were doing it there was a lot of respect for people who change Parts because people will change Parts make the shop money there's a fine line there and business owners need to learn how to walk that line good job with this video I appreciate you showing how some simple steps when troubleshooting can resolve head-scratching problems I repaired a similar problem last night on a friend's car it's been 17 years since I put my hands under a hood yet I knew exactly where to look because I have the same attitude as you you don't always need to have all these fancy tools you just need to have some common sense and some troubleshooting skills

Thanks Scanner. Simple and to the point.

To find an open or a short in a wire, Power Probe's circuit tracer works well. It is unique in that it switches from tracing E field (voltage, open wire) or H field (current, loaded or shorted wire) as needed and LED even indicate direction of current flow. No, I don't work for PP, I'm just a satisfied customer.

Just a note. If you were doing this on a Chrysler product with an ASD relay, you would only get power feed to the injector when the computer receives a crank signal. I suppose if you were working alone, the workaround would be to replace the ASD relay with a uActivate and activate that circuit using that tool.

Another Wonderful Troubleshooting skills and experience

Wow . you realy are scanner Danner, and that was the best dam scannen to make some good planen ive ever seen

I have a 1998 buick with two of the injectors not pulsing. I did already replace all 6 injectors myself. Cheap and easy, and took under an hour. It appears that I need to start digging in the harness for an open connection. . . Electrical problems.can be such a time such. . . Grrrrr!!! ;-)

Proper test procedures save time and money .

Ive said it before... and I'll say it again. This information is GOLD. I'm forever gratefull

WOW i have been looking for a simplistic video for testing injector pulse, for 2 day's now and came across this video, and with the majority of the other video's i've seen i was left thinking there has got to be an easier way to do this , then i found this video , this looks like what i was looking for i will try this tonight and if its really this easy and this technique gets me an acurate result i will be subscribing shortly after!. love the simple approach!

you are NAVY...nuff said! USN retired J Price

Nice, now tracking down the wire failure is the big headache

very adept troubleshooting.

This was suggested to me. Not sure why? Simple think out side of box. Noid lights in my opinion are a waste of money. Just use a bulb. For example the common 168, 194, or 912. Bend the contacts down. The wire is small enough that it makes it difficult to damage a connector from front probe also small enough to back probe. If you broke or lost your homemade noid light. It is not expensive to make another. What's the cost of a 2 back of 168 bulbs in your area? Simple circuit diagnostics is where the break down begins at many shops. At least the customer got a second opinion which I always recommend if it doesn't seem right. More importantly a perfectly good module was not replaced. Keep teaching and preaching test before you put a part on!!!

Enjoy your evening with all your family around you,Sir ScannerDanner My teacher 👍 QUICK-WITTED,Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧 ⏰️ 21:56PM Good Evening

I have a 350z...has P0304 misfire code. I switched the coils, plugs, injectors around. No change in misfire code. When I tore the engine down I found the factory fuel injection harness had butt connections instead of an actual factory plug. I'm guessing it's the wire harness. The VQ35de engine has the injectors hidden under the plenum. So it's gonna be difficult to run this test. I'm just gonna throw a $185 wiring harness on it and hope for the best. Thanks for this video. It made me confident this is the problem I'm having

Thank you scanner danner good video, for us that don't have a scoop👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

Nice one! Don't forget to also check the noid light before using (or at least on a couple of cylinders like you did) ... almost got burnt one time thinking that I had a control problem, when in fact the light was bad.

thank you thank you that was free and it f******* works

excellent video! I just found the solution of my problem!

Abdolutely superb sir.thankyou steve from the uk.

Thanks for the video, if I'm ever in your town dinner is on me!

Real skill!

Thank you!

Quick and easy, thanks for the video Paul

Thanks so very much!

Wouldn't be this test same as performing a continuity test between injector wire connector unplug and at the computer connector wire also unplug pin to pin ? To check if there is an opening if there is continuity then there is not opening or would a wire show continuity no problem but a slight opening big enough to be causing current to drop but just good enough to pass continuity?

Thanks for this. Currently trying to resolve a misfire issue where spark is present and the fuel injector seems to be firing when listening to it through a hose.

thanks paul every little bit helps

thanks for your expert teaching...

Hey I got one for ya...friend had knock sensor code all he had was the powerprobe short checker..I used meter to check for bias...no bias then used meter to check wire to computer with continuity beeper...was beeping on a dozen wires... then used short checker and it was shorted....... after engine swap somebody found a loose blue wire and grounded it...the short checker was invaluable along with bias knowledgeThanks scanner danner! I need your book.

nice find and big help for me has my bmw same on 8 cylinder not firing thx for showing this

Thank you.

Thank you

GOLD!

Hey Paul. Nice refresher. Keep up the the good work. I'm gonna subscribe again.

Helo Danner, I like to know this method of diagnostic more, so if there are more videos like this to show. . . I appreciated, thanks. . .

I have this same Problem. Thanks for the help Paul

If u unplug the injector harness testing each idevidual injector plug and each little prong in them if u test them all and only get light off 1 prong but test another and get light off both prongs whould thr be a short in the harness itself

Mnnnp. Never thought about using my noid lights for injector pulses! Another great video!!!!

Thank you thank you thank you

Absolutely superb sir, Thanku.very helpfull indeed.

Thanks this really helps

2007 Jeep Liberty, 3.7L. Have code faults for #1 misfire, fuel injector 1 circuit open, and Bank #1 lean. There is a slight rough idle, but no misfire perceived, and it runs fine under load and high speed. Doesn't burn oil. Gets 15mpg combined mileage. Ran fine when I got it 64,000 miles. Now it has 110,000 miles. It has had this issue for about 10,000 miles. Not getting worse, but so far plugs and coils and cleaning intake hasn't corrected it. I checked and cleaned Injector and Coils wiring connections and they look good too. #1 Injector plug had some oil in it, somehow. Cleaned it very well with first brake cleaner, then electronics cleaner. Let it dry and reassembled. Can bad Injector o-ring cause this? I already ruled out spark plug, coils, valves, and did intake cleaning. I have not checked orings and the wiring from #1 Injector to the computer control. And don't really know how to. Any tips on checking Injector and its wiring and control while it's still in the head? Thanks!

That was pretty damn good, thanks.

I really dig your viseos they're very informative and ive learned a couple things watching them, but how do i go about testing the injectors when they are sandwiched between the lower plenum and the intake manifold? I have a 01 Nissan Pathfinder 3.5 4x4. If you can give me a couple of pointers or a direction that i need to go in to accomplish this task. Thanks in advance.

Props man, where are your classes located? I would really like attend your classes. Great teaching skills. Well spoken.

I'm not going to be a parts changer.🙏👌. Thank you.

NICE TIP PAUL

Thank you sir

Ah over my head it went. I have a similar thing going on....... and I've tested the wiring on the harness for connectivity and that was fine, I tested it back to the ecu and that was fine but where the injectors are I can't test the electrical side as they are covered when the engine is running on this. I'm not sure if I have a test light but yeah... I'm stuck it's a v6 direct injection and I got banks 4 and 6 misfiring.... changed injectors, changed plugs.... have not done a compression test yet but they were fine before doing the new injectors so I presume..... it is injectors? or wiring...

Cool informative and humbling 👍

That test light trick @ 3:50 only works if the injector is UNPLUGGED!

Just so I am clear the open was on the control side correct ! otherwise if we had 12 volts on the onjector harness, we should have 12 v on the PCM Terminal.

Hey ScannerDanner! I’m trying to diagnose my own vehicle and would love some insight Cyl 4 misfire, ignition is good but it looks like no fuel is getting to that cylinder, swapped out injectors and moved them around and still at cylinder 4. The spark plugs were replaced and you can tell that the 4th cyl plug looks brand new still. So, this leads me to think there is an open circuit somewhere between the ecm and the fuel harness, what would you do in my position?

Great, now all I got to do is search for a wiring harness plan, then learn how to read said plan. what's the upside down tree mean????

very good video

I have a 01 Mercury Grand Marquis I changed my gear selector and they ran before that but now I'm not getting power to the injectors so they can start

Great video. Thank you!

Now i just need to find a good wiring schematic to trace my wires, for the break in my injector harness

Is it also possible to do a 'continuity check' between injector control wire pin and the ecu pin using multi-meter?Ain't the same thing?Great videos man!

Great video for the DIY'er. Score!