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Come along with Eric O. at the SMA garage as we have a closer look at the in cylinder cranking pressure waveforms we gathered with our Pico Scope (files below). One of the best parts about YouTube is the interaction with a you the viewers. A viewer named Steve Stacey inspired me to take a closer look at my cranking waveform on the #5 cylinder and see if we could pick it apart a little more.
Honda Slight Miss Part I : https://youtu.be/Y4wF_Nn2EqU
-Misfire Strategies for Today's Vehicles with Dave DeCourcey: https://www.youtube.com/watch?v=D0LXtvY3Qdg
- Launch x-431 Pad II AE: https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=https://www.aeswave.com/Launch-x-431-Pad-II-AE-301180411-p9586.html
- AES uTest Advanced Terminal Test Kit: https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=https://www.aeswave.com/uTest-Advanced-Terminal-Test-Kit-p9573.html
- 4-Channel PICO 4425 Advanced Kit in case and foam: https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=https://www.aeswave.com/4-Channel-4425-Advanced-Kit-in-case-and-foam-p9525.html
- FREE PICO 4425 Software: https://www.picoauto.com/downloads
- MY FILES ON THIS CAR (Must Download Pico Software First!!): https://drive.google.com/open?id=0B6GLn2hFUMz9VktqdTJkUnJwT1k
If an SMA Video has helped you out please consider giving using "Patreon" to help support us. The videos take real time to create and pull us away from real work that pays our bills. CLICK HERE: https://www.patreon.com/southmainauto
THANKS A MILLION!!
--Eric O.
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Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair 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 South Main Auto Repair, 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 South Main Auto Repair.

49 thoughts on “Honda accord – slight miss at idle – closer look at cranking wavform”
  1. Avataaar/Circle Created with python_avatars stan yuhas says:

    Have been watching you show those cylinder pressure wave forms for a while now. Never fully understood what they meant. After your demonstration with the syringe, I fully understand what the dip in the wave form is. Thank you. I'm just an old retired electrician that is still learning. Stan

  2. Avataaar/Circle Created with python_avatars Hayes Mobile Auto Repair says:

    Thanks 😊.

  3. Avataaar/Circle Created with python_avatars Hola! Craig Goodwin says:

    Eric, I know its been four years but your files don't seem to be available anymore. Anyway I could get those (just for grins>) Also, can't seem to get to your Amazon store either.

  4. Avataaar/Circle Created with python_avatars Beepee Fromabove says:

    Leaking air/fuel mix on upstroke thru exhaust valve is going to wear out the cat(s) sooner.

  5. Avataaar/Circle Created with python_avatars James Kim says:

    It will be nice to take the engine apart to check the theory.

  6. Avataaar/Circle Created with python_avatars Michigeo says:

    he is a great teacher!

  7. Avataaar/Circle Created with python_avatars Allen Cook says:

    Your explanation and your visuals were amazing. Love the way you made technical look easy.

  8. Avataaar/Circle Created with python_avatars Sasuke Uchiha says:

    What did the problem end up being? Experiencing the same issue on an 03 accord. Runs great when it drives, not idling though.

  9. Avataaar/Circle Created with python_avatars JJ Tapia says:

    Hey Eric, ijust wanted to say thank you for taking the time to make all these videos,but specially for making all the learning process so much fun because it is great to find people like you in this world,thankyou very much and god bless you and your family

  10. Avataaar/Circle Created with python_avatars zie_ german says:

    Your an excellent teacher Mr. O. ! Thanks so much for taking the time to do this.

  11. Avataaar/Circle Created with python_avatars Timothy Horne says:

    Very nice illustration. Thanks

  12. Avataaar/Circle Created with python_avatars WouterB76 says:

    If you want the whiteboard perfectly white again, try WD40.

  13. Avataaar/Circle Created with python_avatars gunsaway1 says:

    It’s great to see you give back to the industry. Great instructor.

  14. Avataaar/Circle Created with python_avatars y z says:

    I guess the small vacuum or the small dip shown on the waveform on other cylinder is due to the blow you or leaks from the rings.

  15. Avataaar/Circle Created with python_avatars RJB says:

    If some of the air has escaped on the up stroke through a leaky exhaust valve, wouldn't it suck more air in during the down stroke through the same leaky exhaust valve?

  16. Avataaar/Circle Created with python_avatars Fish Hooker says:

    Scotty Kilmer on the board. I enjoy your diagnostic videos. I think it's because in EMS, we use the same thought process on patients. There is a problem, find signs and symptoms, test and diagnose, form a plan, and treatment. You use your knowledge and experience to form your treatment plan. You never stop learning and use every opportunity to grow. Analysis of cardiac wave forms or in- cylinder compression tests are much the same. Don't stop posting these case studies. You are pushing out valuable knowledge to those that have yet to see complicated problems. Great job Dr. Runsgood.

  17. Avataaar/Circle Created with python_avatars Bluewrench61 says:

    Take a look at how the compression tower is leaning more on number 5 cylinder 5 as well indicating the compression loss as well by going faster into a vacuum

  18. Avataaar/Circle Created with python_avatars Jean carlos De La Mora says:

    Did you fix it and how what did you have to do

  19. Avataaar/Circle Created with python_avatars Dave Scruton says:

    Eric, I was hoping to see the part 3. What did you find under the cover?

  20. Avataaar/Circle Created with python_avatars Jeff Smith says:

    Thanks for the visuals. That makes a lot of sense showing it like you did.

  21. Avataaar/Circle Created with python_avatars carguy1312 says:

    This video was a great addition! If I lived anywhere near you, I’d want to join the team!

  22. Avataaar/Circle Created with python_avatars carguy1312 says:

    I was scratching my head a bit watching the first part trying to understand this concept. This video was a great addition! If I lived anywhere near you, I’d want to join the team!

  23. Avataaar/Circle Created with python_avatars Steven Dunn says:

    Better to over- diagnose than under-diagnose. I can't wait to see you do the thermostat on a 2015 Chrysler 200' 2.4l……just did one yesterday….

  24. Avataaar/Circle Created with python_avatars Paul Santos says:

    Is there another part to this? Looking for closure!

  25. Avataaar/Circle Created with python_avatars Sarah Sargent says:

    Brilliant video Eric,good teaching logic,I’m moving towards aurel maxiscope,I find diagnoses just so rewarding,but ,it so difficult to make it pay,but I enjoy it.great video,enjoy the learning process.thanks.

  26. Avataaar/Circle Created with python_avatars Stephen says:

    He's a good teacher. I have a 2004 Honda Accord 4 cyl.(i-VETC 2.4 DOHC SULEV). The spark plugs have about 50,000 miles on them and the maintenance required light is constant. I plan to change the plugs and the upstream O2 sensor. Although the car has only 118,000 miles and runs perfectly, I'm trying to figure what's going to bite me in the butt.

  27. Avataaar/Circle Created with python_avatars blueeyedevil says:

    I wish you lived in my city Mr. O, I would recommend you to everyone! 😆

  28. Avataaar/Circle Created with python_avatars Chris Corts says:

    So simple yet so fascinating. Great job on the video and science project. Thanx!

  29. Avataaar/Circle Created with python_avatars riblets1968 says:

    I like how you take the long view on diagnoses. Make a little bit of extra effort today to save you tons of time and aggravation down the road. That's perfect in my view. Strategic thinking pays off.

  30. Avataaar/Circle Created with python_avatars PTA Weston says:

    So what was the solution, the final fix? A valve job? Did I miss part 3? Did you fix the problem?

  31. Avataaar/Circle Created with python_avatars srigokul nath says:

    Sir I have one doubt, anyway if there is an exhaust leak it should be in all over the process right..?
    So if air escapes through the leak during compression then that air should come again via that leak simultaneously as the pressure drops below the atm pressure
    Then how the cylinder holds vaccum till the exhaust valve open even under the leaking circumstances.

  32. Avataaar/Circle Created with python_avatars sewing1243 says:

    I can't find a follow up video to this and previous diagnosis video. Did Eric O ever pull the head on that engine? What did he find when/if he did?

    With an issue like that is it possible that the valves on the front bank have a carbon build up that could be dealt with by one of the various "treatments" with one of the various fuel cleaners? If yes how do we know that without either trying a "treatment" or pulling the head?

  33. Avataaar/Circle Created with python_avatars Cuba's Automotive says:

    Next thing you know, you'll be teaching alongside Brandon Steckler 😍😍 or Scot Manna! 😍😍 I love their lessons on this topic and they both seem to complement each other. You using the syringe is right out of Steckler's class. It's a great visual. I think it's what helped drive what I was seeing on the waveform home for me.

    Excellent nerd out video! 🤓🤓🤓👍👍👏👏

  34. Avataaar/Circle Created with python_avatars Robert Welch says:

    Damn man. Great video. Great explanation. Probably made the most sense to me than any other thing has ever in my whole life. Amazing diagnostic tool. I love your videos.

  35. Avataaar/Circle Created with python_avatars Mike Mardis says:

    If you have a leaking valve, wouldn’t you pull the air loss as you go bdc?

  36. Avataaar/Circle Created with python_avatars Jerry PEAL says:

    Made sense

  37. Avataaar/Circle Created with python_avatars Garth Clark says:

    The white board example was good enough for me to get the idea of what is happening to that cyl. Makes complete sense. Great classroom video.

  38. Avataaar/Circle Created with python_avatars Moon Moon says:

    Greetings, viewer. Eric the South Main Auto guy here. If it’s your birthday, happy birthday!

  39. Avataaar/Circle Created with python_avatars Moon Moon says:

    The same people who think that over-diagnosis is a thing are precisely the same people who fire a parts cannon at their car and bitch that it’s cost them so much money and it’s still broken.

    When you go to the hospital because it’s suspected you have cancer, do you want them to just say ‘yeah maybe, you said you might have cancer so we’ll go with that’, or would you like your doctor to actually do their fucking job?

    You people will bitch about anything. Fuck right off with your ‘over-diagnosis’. I’ll diagnose my car however the hell I want, and will fix it properly, accordingly. And I don’t think it will be going out on a limb too much, here, to suggest that Eric will do the same.

  40. Avataaar/Circle Created with python_avatars John Helm says:

    Eric you're killing me every time you say escape you actually say exscape Rant over

  41. Avataaar/Circle Created with python_avatars Pete James says:

    What an absolutely perfect way of demonstrating cyl. Pressure loss. From PICO to practical demo. OUTSTANDING Mr O. Absolutely outstanding.

    Anyone not understanding your demo… Well better leave it there eh? Probably too busy loading the parts cannon.. Maybe!

  42. Avataaar/Circle Created with python_avatars DIY Dave says:

    Perfectly explained!! Even a total dunce DIYer like me understands exactly what you're describing. Heck, the stuff is fascinating. Wonder if managing four family cars is enough to justify buying a scope 😁😁. Great job as always, Eric!

  43. Avataaar/Circle Created with python_avatars TacoSupreem says:

    So how did you fix this or what did it need repaired or adjusted?