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In this video I show you how to diagnose a "no code" misfire on a 2008 Mercury Sable 3.5 that is not setting a check engine light. This is where the OBD II Mode 6 data can come in really helpful at pinpointing the problem. -Enjoy!
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49 thoughts on “Diagnosing a no code misfire using mode 6 data”
  1. Avataaar/Circle Created with python_avatars Roger R says:

    Just bought a BlueDriver scan tool, first time i used mode 6 it showed over 8500 misfires on cyl 3 on my 5.3 2011 Tahoe. Have checked it a couple more times and only having 3-7 per scan after 30 miles of driving or so. Rough running after cold start for 20 seconds maybe then runs ok. Did have 1 misfire on 5, hoping it’s due to what you explained here. Great video. Thanks 👍

  2. Avataaar/Circle Created with python_avatars Viheavyequipment says:

    I have a 2013 f-150 with the 3.7 it has a stutter miss fire in park at idle it’ll be smooth then stutter then smooth then stutter sometimes it’s really bad when I’m parked drinking my coffee. Lately I had noticed it kinda misses when stopped at a light at idle but mostly only in park. The ford dealer has replaced the spark plugs, intake gasket, smoked the intake checked cylinder conterbution and fuel pressure cleaner mass air flow and can’t find anything and there’s no check engine light but ive drive 3.7 before and usally there so smooth you can’t tell there running but not this one. Do you have any insight on this it’s drivin me nuts they say the miss counter shows cylinder 6 but they all has some miss fires 6 the most

  3. Avataaar/Circle Created with python_avatars Stephanie says:

    If only I had a mechanic like him in San Diego! There’s tons of them here but can’t find one that can think past “there’s no check engine light” and “there’s no codes”. Great video! Thank you !

  4. Avataaar/Circle Created with python_avatars james rossi says:

    I heard it!

  5. Avataaar/Circle Created with python_avatars Jason Fromm says:

    Any idea, 2015 pathfinder 50,000,, miles, no codes pending, misfires on all clylinders, only between 1-5, jerks rather violently, only on very slow light acceleration, , but runs good otherwise, above 70degrees out won’t happen, but u can hear the same rumble like it wants too, possibly spark knock? Only about 1000, rpms,

  6. Avataaar/Circle Created with python_avatars Craigie F Concert says:

    I wonder if you could use some kind of dye to reveal the cracks in the spark plug porcelain. Maybe the stuff that a dentist uses to stain plaque.

    From a car owner perspective, they should know how many Miles are on the plugs and with a misfire plugs are an easy first step in a tuneup.

    Do the valves need adjustment on fords?

  7. Avataaar/Circle Created with python_avatars John Savage says:

    Cheap Motorcraft plugs! Ford's better ideal!

  8. Avataaar/Circle Created with python_avatars crespino says:

    thank you

  9. Avataaar/Circle Created with python_avatars crespino says:

    you the best

  10. Avataaar/Circle Created with python_avatars Dale Humes says:

    Eric O. YOU are a frickin genius!

  11. Avataaar/Circle Created with python_avatars Jesse Glover says:

    LOL at most shops if a customer asks for a fuel filter and you don't recommend one you're gonna get asked about that.

  12. Avataaar/Circle Created with python_avatars ferdie fox says:

    Don't worry, domestic car if they say it needs new fuel filter it's probably just transmission, ecm and main bearings goin out.

  13. Avataaar/Circle Created with python_avatars Lisa Paul Parsons says:

    U should of been a surgeon dude.

  14. Avataaar/Circle Created with python_avatars shaun says:

    Good call on sparkplug

  15. Avataaar/Circle Created with python_avatars Richard Martini says:

    Find things to talk about… Oh Yes
    I sometimes I get more/ needed info
    from you guys just talking shop.
    Please do it much, much more often.
    It is realy a plithera of info
    I wish more of you guys would do that, then yapping
    After all, I am hear to learn…sir

  16. Avataaar/Circle Created with python_avatars Byways no Highways says:

    I was looking for you doing the mode 6 again to show if the code moved.. Did I miss that?

  17. Avataaar/Circle Created with python_avatars Jimmy Tindall says:

    Man I got a 2011 Nissan Sentra that is doing the same thing this car is doing I put new plugs coil packs, fuel injectors any idea what to check I'm using a launch scan ob2 i would appreciate any advice on it

  18. Avataaar/Circle Created with python_avatars SheerWill Survival says:

    Another awesome video great investigation and find

  19. Avataaar/Circle Created with python_avatars Homero Aguilar says:

    Hello Mr.O how are you? I had a question for you, I'm getting tired of my 07 chrysler 300c 5.7 engine I got a misfire on cylinder 5 and I changed the coil 3 to 5 and I did the compression test on cylinder 5 and 3 and both are 150 and 148 the misfire still on 5 In not sure how much experience you had on hemi engines do you know what else can cause a misfire on this cars thank you in advance

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

    It was plug was crack thanks

  21. Avataaar/Circle Created with python_avatars Rocky Nix says:

    Spray some magniflux on it … LoL …

  22. Avataaar/Circle Created with python_avatars Cody says:

    Thanks for this detailed video! My trailblazer is doing the same thing at these speeds and I think it’s a spark plug/boot issue. Replaced valve cover gasket due to oil in my spark plug wells. Didn’t replace plug/boot just to see if it still worked.

  23. Avataaar/Circle Created with python_avatars michael dennis says:

    As always another great video . I am retired and as a DIYer or Hobby mechanic I love watching You Tube to catch up with the industry . I follow many sites , But I truly believe you are the BEST by far .Thanks for all your effort .

  24. Avataaar/Circle Created with python_avatars Alton Rowell says:

    I've got the same problem with my car.

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

    Eric – you are indeed one very knowledgeable automobile technician. I would absolutely enjoy working under your lead in your shop – would learn more in six months time than on my own in two years. 👍👍✌️✌️✌️✌️

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

    You say stupid cars on your test drive after swapping coils – I can surely say – I know EXACTLY where you are coming from 😒✌️

  27. Avataaar/Circle Created with python_avatars Mark says:

    Nice find. Saved this guy some money. Nice job👍

  28. Avataaar/Circle Created with python_avatars Ken Pressley says:

    Beautiful area of NY. Sure a lot nicer than NYC. Great diagnosis!

  29. Avataaar/Circle Created with python_avatars buscuttbutchie says:

    SMA is the best tutorial for Diagnostics that I've ever seen on YouTube! Hats off to Eric O and his crew. That being said I have a 2007 GMC Yukon Denali XL 6.2 L with OBD2 code P0 300. I have massive misfire at Pistons 1 and 3. At a rate of 48 and 30 respectively. Also the fuel trim for Bank One is 56 short-term zero long-term for Bank One and 14 short-term and 0 long term for bank 2. Also I smell an enormous amount of gas through the exhaust. All these symptoms lead me to think it's an ignition problem. The car idles. The engine revs but no power when you put it in drive and step on the gas it literally crawls. Any advice that you could give would be greatly appreciated. I was told to check the ground wire for the coils

  30. Avataaar/Circle Created with python_avatars Throttlethumb 150 says:

    Super informative love these type of videos.

  31. Avataaar/Circle Created with python_avatars gtubyyy says:

    PLUG GAP AND HIGH RESISTANCE AT THEADS DUE TO CARBON CURED BY ANISEIZE AND NEW PLUGS HAVE WATCHED NEW PLUGS AND WIRES SPARKING DUE TO OILY THREADS ON HEAD., CHROME PLUGS NEED ANTISEIZE ON THREADS. THAT MAX LOAD OFF IDLE IN HIGH GEAR LOAD IS A PISSER FOR THE PATH OF LEAST RESITANCE BEING NOT THROUGH THE GAP ON THE PLUG

  32. Avataaar/Circle Created with python_avatars robert cale says:

    how about some info on that huge red barn just outside of town

  33. Avataaar/Circle Created with python_avatars Richard Edward says:

    My 02 F150 has a cylinder 4 that turned out its the coil plug that won't click into place so every once in a while it'll start misfiring. I love watching this guy, I always see differing ways to diagnose these problems. Thank you big guy for another great video!

  34. Avataaar/Circle Created with python_avatars John Weiland says:

    Your way past my skill level. Mrs O might be past my skill level.

  35. Avataaar/Circle Created with python_avatars Nvable says:

    Good evening. I know this is an old video but it is still helping people.

    I had a issue with a rough running 2003 GMC Envoy 4.2L. It had cam, VVT and crank sensor codes but no misfire. I replaced the parts and it still ran rough.

    Three days later after replacing spark plugs it finally gave me a misfire. It was in sixn I moved to 2 for easier access and it traveled. I could have used the Mode 6 data to diagnose. Now I know and knowing is half the battle.

    Thank you for your continued teaching.

  36. Avataaar/Circle Created with python_avatars Husayn says:

    This guy is great. He knows things. Thanks for the insight. Excited to change out the spark plugs.

  37. Avataaar/Circle Created with python_avatars W says:

    My misfire tools consist of any bolt or nut that I can ground or lay a spark plug that is unscrewed from the head and a regulation spray bottle full of high quality H2o.

  38. Avataaar/Circle Created with python_avatars abdulmjid alomar says:

    شكرا لك انت رائع

  39. Avataaar/Circle Created with python_avatars John Moore says:

    i got smarter watching this.

  40. Avataaar/Circle Created with python_avatars Travis says:

    alot of plugs r like that, its worse with cheap plugs obviously if u look close theyll have tiny spots n lines like that that they glaze just didnt take to the plug for whatever reason, it wouldnt hurt to slather a little layer of dielectric over plugs

  41. Avataaar/Circle Created with python_avatars Travis says:

    holy shit that was like a 3/4" spark gap lol :p

  42. Avataaar/Circle Created with python_avatars Jeffrey Battousai Strader says:

    I bet $5 that those are the FACTORY PLUGS!………I bet that car has NEVER had a tune up!!!

  43. Avataaar/Circle Created with python_avatars You says:

    "No Codes", but "Service Engine" light is steady/eddy on ?

  44. Avataaar/Circle Created with python_avatars mrdfoutz says:

    Yet more proof that a cheap picture frame holding an expensive certificate is no indicator or guarantee of expertise.

    Mr. O, you are an Automotive Scientist. I'm one of many who wishes our proximities were closer so that you could be MY Automotive Scientist!

  45. Avataaar/Circle Created with python_avatars family fleet diy says:

    Stopping in to say thank you for taking the time to create such great content, very useful information!

  46. Avataaar/Circle Created with python_avatars motox quasar says:

    Awesome video. Subscribed!

  47. Avataaar/Circle Created with python_avatars Mike L says:

    Excellent video and details on diagnostics. How am I now finding your videos. Going to learn today I am. Any idea why car would do this it's a 2003 Acura No CEL
    My issue is at idle 850rpm in neutral/parked the car runs great till warm or if give I touch gas pedal to rev to 1500-2000rpm s idling is gone and begins acting up cutting in out and a few seconds later randomly shuts off. The car will start right back up and will do it same thing. What got me stumped is no CEL

  48. Avataaar/Circle Created with python_avatars Tony Reyes says:

    Launch X431 Pad 2 great scanner

  49. Avataaar/Circle Created with python_avatars France says:

    Ford motorcraft web site has obd related service data for free ie criteria for misfire

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