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Come along with Eric O at the SMA shop as we have a look at this Honda Accord 3.0 that has a slight misfire at idle and goes away when you give it a little gas. This testing process could have been done very quickly but we take some time to try an analyse this one in several different ways using our PICO Scope with a WPS500 cylinder pressure transducer. We also explain the importance of gathering all the data you can before tearing into an engine, because once them heads are of there is no more starting it to "check one last thing." --Enjoy!
Honda Slight Miss At Idle Part II: https://youtu.be/aSDQy3wop5I
-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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--Eric & Vanessa O.
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South Main Auto Repair
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Avoca, NY 14809
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.

45 thoughts on “Honda accord – slight miss at idle – case study”
  1. Avataaar/Circle Created with python_avatars Luke * says:

    Good job and thanks.

  2. Avataaar/Circle Created with python_avatars Richard Ramero says:

    For the cost of labor and parts and machine shop might as well get another motor with a warranty

  3. Avataaar/Circle Created with python_avatars jlwoot says:

    Is it possible that excessive carbon could be keeping the Exhaust valve open? It would not have taken long to put a camera in the cylinder and examine the valves….Just thinking that that might save pulling the head if it could just be excessive carbon.

  4. Avataaar/Circle Created with python_avatars Charles Gould says:

    Honda usually starts quick like the cranky chevy!

  5. Avataaar/Circle Created with python_avatars GALLEGOS SOUTH says:

    wow i never knew, connecting a car to a computer, could Give you some Idea and ALOT of Info on what it could be!

  6. Avataaar/Circle Created with python_avatars Of Xaos says:

    Oh yeah compression checks are just like changing oil right? Lol couldn’t even begin to imagine… I have a crazy issue with my 05 Honda Accord. But mine has sat for 2 years with a full tank of low grade gas. I’m hoping that’s the only problem I have aside from needing to do maintenance. Love these videos

  7. Avataaar/Circle Created with python_avatars Coy Carlson says:

    As mentioned to me years ago – your tools can make you or break you , the smoke machine test – showed smoke coming out the exhaust pipe and knowing the timing indicators aligned properly – pulling the head is the call 🤔👍✌️

  8. Avataaar/Circle Created with python_avatars boostedsil40 says:

    is there a rule of thumb for how much compression loss is needed at bare minimum to start a misfire?

  9. Avataaar/Circle Created with python_avatars Froggy 01 says:

    Number 5 is … not alive…

  10. Avataaar/Circle Created with python_avatars Azzam Haq says:

    Just wondering if it "Hon du" or Honda?

  11. Avataaar/Circle Created with python_avatars Marc Broust says:

    How do you know that your exhaust valve is in the closed position during the shmoke test?

  12. Avataaar/Circle Created with python_avatars Kerry P says:

    Wow ! i have been an Electronic tech for over 50 Years and I am so impressed at your skills
    to understand how these modern cars use electronics to do everything ! The days of the shade tree
    mechanic are forever gone. If you're successfully fixing modern cars, you understand the electronic
    components involved ! Kudos to you, and to the handful of techs out there with your knowledge !
    I know that you will do well and your videos are teaching many would be techs about what's needed
    to diagnose these newer vehicles. Love watching your videos and what it takes to resolve problems
    that did not exist 25 years ago.. Amazing. Thanks ! Keep up the great work..

  13. Avataaar/Circle Created with python_avatars Stacy Dornan says:

    Your the Man Eric

  14. Avataaar/Circle Created with python_avatars First Last says:

    Disney is Democrat filth I despise them

  15. Avataaar/Circle Created with python_avatars Gunner S says:

    "I'm surprised the check engine light isn't on"
    Immediately starts flashing

  16. Avataaar/Circle Created with python_avatars Buff Barnaby says:

    This is like 10 layers deeper than Kilmer can do.

  17. Avataaar/Circle Created with python_avatars James Bristow says:

    So is AES wave a Sponsor, you didn't mention. Also, that kit is bad ass, probably gonna order

  18. Avataaar/Circle Created with python_avatars Marvin Naputi says:

    What scanner was you using

  19. Avataaar/Circle Created with python_avatars Ebuka Eze says:

    I have an 06 accord V6 manual, I get this code P1078 after a check engine light came on. I couldn't find a video about it on YouTube. Please is there anyway it can be fixed. I know it says IMRC system malfunction but I couldn't fix it since there is no video online on how to fix it.

  20. Avataaar/Circle Created with python_avatars azstumbler says:

    Electron flow is the flow of electrons from negative to positive. Conventional flow is the flow of the electron holes.

  21. Avataaar/Circle Created with python_avatars Paul Campbell says:

    Hey Eric, have you ever hit the camera when you are doing your arm waving intro?

  22. Avataaar/Circle Created with python_avatars Dave bifolchi says:

    Good Stuff better then TV these days but that Jeep hat has seen better days….:)

  23. Avataaar/Circle Created with python_avatars Russ Bales says:

    Loved Sheba (dog) sniffing the car at the end of the video. Low compression is definitely not due to contraband. "Detected something under the seat. There's your problem, lady!"

  24. Avataaar/Circle Created with python_avatars Red Toberts says:

    Considering that engines idle much smoother, and start easier after a really long highway drive, if an around town driven engine is a bit rough personally I wouldn't worry. We used to see it in brand new motorcycles all the time. Babied whilst new they would have hesitation and misfire issues until given a work out. Mates brother a good car mechanic said the same was true with cars.

  25. Avataaar/Circle Created with python_avatars Ashley Garrison says:

    Babcock gpsanag ect

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

    What did you conclude with this car?

  27. Avataaar/Circle Created with python_avatars Roverturbo says:

    Haven’t scrolled through the comments…. but did you know… that Honda beeping noise when the key is in… is morse code for H. I.e Honda. 4 beeps.

  28. Avataaar/Circle Created with python_avatars Rory Wynhoff says:

    Superb video!

  29. Avataaar/Circle Created with python_avatars Rose Barnes says:

    Seems to me you are making this much harder than is needed…. there are misfires at idle, but car runs good just off of idle. Put a piece of posicle stick between the trottle cam and the trottle stop, problem solved!!! 🤣🤣🤣

    Seriously though, love your channel!!!

  30. Avataaar/Circle Created with python_avatars ‍1marcelfilms says:

    Slight miss at idle? Turn up the idle

  31. Avataaar/Circle Created with python_avatars hondaslave1342 says:

    Love these cars

  32. Avataaar/Circle Created with python_avatars Michael Knorr says:

    First idea is tps.

  33. Avataaar/Circle Created with python_avatars Spixy cat says:

    How is the misfires determined by the ECU?

  34. Avataaar/Circle Created with python_avatars tyler238 says:

    Question.. my heat only gets hot when I push the button to get the heat off of the engine

  35. Avataaar/Circle Created with python_avatars Jason Combs says:

    Boy, how lucky. Cyl 5 at TDC on compression stroke without hunting for it. Hopefully you have gotten yourself a tens unit by now, one of the best purchases I've ever made.

  36. Avataaar/Circle Created with python_avatars william zwit says:

    Eric, The point you said about the crank sensor determining a misfire. is the scanner doing that how? Do you know?

  37. Avataaar/Circle Created with python_avatars Joseph Franklin says:

    Dodge well, had a 1999 Dakota had over 300,000 mi. before trade in for a2004 Ford F-150 Haitage 4.6L V8

  38. Avataaar/Circle Created with python_avatars Joseph Franklin says:

    Honda's are cool cars!!

  39. Avataaar/Circle Created with python_avatars Harry Kaminski says:

    You could of did what you did with a 20 dollar harbour freight compression tester

  40. Avataaar/Circle Created with python_avatars RJB says:

    Am I the only one that doesn't get notifications any more?

  41. Avataaar/Circle Created with python_avatars Kevin Haddock says:

    Eric, for your arthritis, check out Joel Wallach and also MSM

  42. Avataaar/Circle Created with python_avatars Kevin Haddock says:

    Physics pay attention to the electrons. Engineers to the holes

  43. Avataaar/Circle Created with python_avatars Gelo U says:

    …all this because of VCM?

  44. Avataaar/Circle Created with python_avatars Josh Clark says:

    Does anybody know why the cat converter would gobblle up the smoke when there hot like Eric said. Thanks

  45. Avataaar/Circle Created with python_avatars Steve Stacey says:

    The cranking waveforms show much more difference between cyl 1 and 5 than the running ones, probably because at low cranking speed there is more time for air to leak out of the cylinder during the compression and expansion strokes. The cranking test also has atmospheric pressure at the start of the compression (due to WOT rather than idle manifold vacuum) so the cylinder pressures will be higher, increasing the amount of leakage. On the cyl5 cranking trace the pressure at the bottom of the expansion stroke is lower than at the bottom of the intake stroke, if the pressure is lower and the volume of the cylinder is the same (piston at BDC in both cases) then physics says there must be less air in the cylinder by the end of the expansion stroke – as there is no combustion you would expect the compression and expansion strokes to cancel out (you take a fixed amount of air at BDC intake, compress it to TDC firing, then expand it again to BDC expansion and end up back where you started….assuming a slightly idealised case where the intake valve closes exactly at BDC and the exhaust valve also opens exactly at BDC). I don't think the pressure trace can tell you where the leak is (inlet valve, ex valve, rings) – just that there is/isn't a leak….

    Thanks for sharing the scope data, really interesting to have a look at

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