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Come along with Eric O at the SMA shop as he uses the PICO Scope to track down a secondary ignition problem on this misfiring Hyundai Sonata with the 2.7 V-6. Reading secondary ignition waveforms is an art-form in itself and something I struggle with. Looking forward to learning more as time goes on!!
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47 thoughts on “Hyundai sonata misfire – diagnosis”
  1. Avataaar/Circle Created with python_avatars Sam Thompson says:

    I have a issue with my 2004 on number six. Now I know what to look for. Thanks for this video.

  2. Avataaar/Circle Created with python_avatars Robert Harris says:

    He has one cylinder misfiring, Why not pull that spark plug……first thing?

  3. Avataaar/Circle Created with python_avatars cantwaitkid says:

    We currently have a 2003 2.7 L Hyundai Sonata in our shop and it had a misfire. We ran the scanner on it, and it fried 2 02 sensors. Changed those and obviously gave it a spark plug and wire job and changed the coil pack as well; but even after all that, it's still has a problem under throttle. It's not bucking and carrying on like it was, it is definitely smoother but has no power. any suggestions?We're baffled.

  4. Avataaar/Circle Created with python_avatars serag ali says:

    My car is Sonata 2009, American import, engine 24. It has a malfunction. When the rpm reaches 1500 revolutions, the engine shakes, whether it is moving or standing, and results in a weak engine torque.. I went to the technician more than once and he connected it to a fault detector, but to no avail without any result. .. so what is the solution?

  5. Avataaar/Circle Created with python_avatars Jay T says:

    I have a 06 hyundai sonata I got cylinder numbers 6 misfire replace spark plugs still has it so I swap number 6 coil wit number 4 an sure enough number 4 started misfiring so hopefully I replace coil am it will be fixed

  6. Avataaar/Circle Created with python_avatars roger williams says:

    I miss my scopes last one was a bear base with four gas

  7. Avataaar/Circle Created with python_avatars peter barber says:

    Hi im from Australia.I have a 2002 hyundai santa fe 2.7-6.Would it be worth while taping brand new ignition leads above the plugs like you did in this video

  8. Avataaar/Circle Created with python_avatars peter barber says:

    Hi I'm from Australia.Could you please tell me what the firing order is in the coil from front to back

  9. Avataaar/Circle Created with python_avatars Shane Harrison says:

    Awesome I first thought it was skipping but I see that it was misfiring out of the cylender and now better know and understand better the reason why and how that appears to happen

  10. Avataaar/Circle Created with python_avatars Ivan Olsen says:

    and an oil change

  11. Avataaar/Circle Created with python_avatars hairburger62 says:

    Show the diagnostics without a tech stuff, then people will be impressed! Not every one has diagnostic equipment! I do, but many people see this as a non-informative show off video! Not very home school or professional! Bad video segment!!!!!!!

  12. Avataaar/Circle Created with python_avatars Michael Mills says:

    My 4 year old niece wandered into the garage yesterday when I was using the pico secondary ignition probe and loved it 😂 it held her attention for an hour at least.

  13. Avataaar/Circle Created with python_avatars Kevin Culver says:

    Thanks Eric. Enjoy the more detailed training style approach. Hope all is well there in Avoca these days.

  14. Avataaar/Circle Created with python_avatars BoscoMoney says:

    Way too much tech diag

  15. Avataaar/Circle Created with python_avatars GNX157 says:

    I would of squeezed some dielectric grease in there too.

  16. Avataaar/Circle Created with python_avatars Fred Bach says:

    A good plug and a good new boot with sufficient and proper dielectric grease should eliminate this happening. One point to remember is that a really sharp edge on the spring or the clip that snaps onto the plug can concentrate the HV field and cause a local breakdown which could eat the rubber. One more reason for using copious dielectric grease. It's not just a lubricant. It seals out water AND it stops those tiny discharges at sharp points.

  17. Avataaar/Circle Created with python_avatars Luke Lapoint says:

    Lets remember, 1st of all great job. I'm old and remember Toyotas that cheap plugs wires were put on without the insulating ring at the end of the spark plug wire, then check your gap and old plugs.. Then the ones that get you are hairline carbon tracks. Then it was cold starts dropping that cylinder. For ugly intermittent problems try a bit of power braking then things happen quickly.. Thank you young man I don't watch tv anymore,,,, Your thought process and experience really shows in the way you process in the thought ,,,,, Okay what's the why of it all….. Lets do some more of this(:

  18. Avataaar/Circle Created with python_avatars thomas mcdonald says:

    My sonata has five cylinders misfiring due to the engine design flaw in the rain. Fixing it and then selling it. Thank God I only paid $800 for it. My car looks mint and has been kept up meticulously by the original owner and the Hyundai dealer would only give them $750 at trade in for a brand new one. Why? Cuz Hyundai knows they have frequent problems in the rain and wet.

  19. Avataaar/Circle Created with python_avatars Jessie Ray says:

    i have a 2005 hyundai santa fe 2.7 Lv6 when i turn the key on and start the car it runs then start to shake then stops the fuel light is on but with a half tank of gas beside shaking i hear a rattle then it stops if you can tell me what the problem is it would help out.

  20. Avataaar/Circle Created with python_avatars John Ferguson says:

    That's not a Hyundai. It's a 3700 lb STUN GUN …..
    Ride The LIGHTNING

  21. Avataaar/Circle Created with python_avatars jsj297 says:

    Did u try just rubbing some dirt on it?

  22. Avataaar/Circle Created with python_avatars Thomas Hurt says:

    As Jim morton said “high resistance external the combustion chamber.”

  23. Avataaar/Circle Created with python_avatars Steve C says:

    You could also swap wires with another cylinder and at the coil and see if the problem moves. This would clear the coil and clear the spark-plug and for sure tell you the wire is bad. If it didn't have tracking like this one did.

  24. Avataaar/Circle Created with python_avatars Jim B says:

    eric o I got a 2007 Hyundai entroung 3.8 and am about to pull my hair out on this van …it got a p0300 and p016 codes and I have install a cam sensor and even swap them from the rear to the front and swap out a the crank sensor and had my friend check it and said 4 and 5 coils where misfiring and so I changed 1 3 5 so I dient have to keep removing the pleum and its still getting the p0300 I wish I live closer but am stuck here in maine lived in conn …let me know what u think

  25. Avataaar/Circle Created with python_avatars Charles L says:

    They make insulated pliers for pulling wires. You are crazy yanking out those wires. It seams every time I yank the wire off my lawnmower I get it haaaard

  26. Avataaar/Circle Created with python_avatars DigitalYojimbo says:

    Pfft, video's too long you should have just clicked the "fix it" button. 😄

  27. Avataaar/Circle Created with python_avatars spelunkerd says:

    What a great demonstration.

  28. Avataaar/Circle Created with python_avatars Bart Young says:

    When you disconnect the injector, I think you will see the lean cylinder difference on the scope if you power brake the vehicle. The firing line will slope upward. At idle it may be able to sniff some fuel from the manifold and other cylinders, but won't keep up under load. The secondary miss will show up better if you power brake it as well. Nice videos.

  29. Avataaar/Circle Created with python_avatars Dalton says:

    Little elec. tape and it's good for another 50,000 miles..

  30. Avataaar/Circle Created with python_avatars Jan Verschueren says:

    Maybe you could have done with turning on the "Peak Detect" function for this test. With any of these digital displays of waveforms, you have to keep in mind you're looking at a graphical representation of a series of numbers, taken at discrete intervals, depending on your time base setting and screen resolution, from an even larger number of values which are actually being sampled and held at the A/D converter. In this manner, it's quite easy for your display to "step over" the actual peak value from the coil just before the spark occurs.
    By turning on the "Peak Detect" function, internally, the scope continually flags the highest voltage measured over the time period between two pixels on the screen, so, even though it might turn your trace more "fuzzy*, you should get a more consistent read-out of the spark threshold voltage.

  31. Avataaar/Circle Created with python_avatars talkntribe says:

    anyone familiar with Hyundai Sonatas. I bought a 06 sonata v6 3.3 96k miles from a neighbor for 2k. vehicle now has 105k. and I'm starting to experience oil loss. every day I check the levels. no sign of oil leaking anywhere around engine or floor.

    my wife drove to work one day and it was fine. go to come home and engine shook ,check light came on. shut off the car and it was about 1qt low. this happened to me back in September. only it took 2.5 quarts. filled it back up and got oil change.

    seems like every 4k miles this crap happens. is it normal to burn oil this fast. to have the engine shake on a quart low seems off. sometimes wonder if dipstick is giving wrong readings.

  32. Avataaar/Circle Created with python_avatars Ron James says:

    Another Awesome video thgthganks for the lessons Chris

  33. Avataaar/Circle Created with python_avatars Chad Ross says:

    Do you use the primary side method in any of your videos?

  34. Avataaar/Circle Created with python_avatars Ron Price says:

    Please Eric put an idler or tensioner and belt on that thing…!

  35. Avataaar/Circle Created with python_avatars Nate Rowe says:

    Is it wrong to wonder if something caused that tracking in the first place? Perhaps broken electrode on the spark plug causing excessive gap and the spark found somewhere else to go, through the plastic?

  36. Avataaar/Circle Created with python_avatars sergio bayardo says:

    that's the beauty about this job , that we can find new and more efficient ways to find problems, and always learning new things,good videos, and thank you for taking the time to post them,

  37. Avataaar/Circle Created with python_avatars Zak 6959 says:

    I would also recommend those squeaking idler pulley's

  38. Avataaar/Circle Created with python_avatars Sam Rugtiv says:

    thanks e o

  39. Avataaar/Circle Created with python_avatars Walter Payne says:

    i have a 2003 GMC Sierra with P0300 code i changed all the wires and plugs, i also checked all the coils with a spark tester and still have a random multiple miss fire, can you tell whats the problem i don't have the equipment that you have. HELP PLEASE, Thanks in advance

  40. Avataaar/Circle Created with python_avatars David Okanagan says:

    Really like your trouble shooting technique.

  41. Avataaar/Circle Created with python_avatars Moggie20170000 says:

    thanks you just answered my question . it does have a ground

  42. Avataaar/Circle Created with python_avatars Ronald Cach says:

    Hi Eric, why were you looking for oil around the spark plug boots? THANKS FRIEND

  43. Avataaar/Circle Created with python_avatars Moggie20170000 says:

    I noticed the probe does not have a ground clip to bleed off a spark that might come through the insulation. I know its shielded but ??

  44. Avataaar/Circle Created with python_avatars M Barry says:

    Yes, more secondary analysis and programming in future videos, please.

  45. Avataaar/Circle Created with python_avatars kaffetrakter says:

    Or you could just have used 10 seconds to inspect the wires before you used your scope, and this job would have gone a lot faster 🙂