Diagnosing Misfires

On this episode of Fear No Fix, Chris and Jordan break down how to diagnose misfires. Most often, a misfire will result from a problem with the ignition system, so that's the area of focus in this video.

If you need to read codes or live data to help diagnose your issue, BlueDriver can help! Get the #1 Scan Tool on Amazon here:

Top DTCs (Diagnostic Trouble Codes) associated with Misfires:
• P0300
• P0301 through P0312

Top symptoms associated with Misfires:
• Check engine light
• Rough idle
• Stumbling and Vibrations
• Loss of power
• Poor acceleration
• Excessive exhaust smoke
• Abnormal engine noise
• Poor fuel efficiency

Video Sections:

Intro: (0:00)
Reading Live Data (0:35)
Reading Mode 6 (1:41)
Swapping Ignition Coils (2:35)
Swapping Ignition Coils (4:19)
Unplugging Coils (5:52)
Testing Resistance (6:14)
Spark Tester (6:41)
Examining Spark Plugs (7:54)
Testing Spark Plugs (10:06)
Inspecting Plug Wires (11:29)
Outro (12:21)

[TerminalChillness]

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[lordcomas]

This is the very first time that blue Drive shows me something additional and of value. I wish they had more videos and diagnostic solutions.

[chuchu-eefv]

The lil Bluetooth is life saver and smart way to do things

[therapgame]

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[rualmet]

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[don]

Great video. I would like to add for those with plug wire testing is to get in a dark area allow time for your eyes to adjust to the darkness and run the engine at idle in this well ventilated area and look. You will see the spark.

[johnmeek]

Man I'm loving my BlueDriver... thanks guys, these videos are awesome and super helpful for the DIYers. Keep these informative videos coming. These videos along with LIVE features make working on cars so much easier, time saving and more money in my pocket at the end of the repair bcuz I'm not spending money on parts I don't need !! BlueDriver will remain in my car forever and also any future vehicles I may own. BlueDriver is a game changer and a genius product, I absolutely love it and all the knowledge I'm gaining about working on my own vehicle...

[MagnumOpusSRT]

I really like my blue driver. Very useful.

Please incorporate bi directional interface in the future such as ABS brake bleeding and steering angle initializing.

[mayken]

I love my BlueDriver . Doesn’t do all an expensive tool does but does more than enough for me - working on 3-4 cars weekly

[volodymyrvolodymyrovich]

One of the best things I bought for my car

[geraldryan]

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[themaestro]

I got P300, 301, 2 and 3 in our 2013 Honda Pilot 184, 000 miles. It was running great and there’s no noticeable misfires so I’m bewildered at why those codes were thrown. So I pulled the plugs out on 1 and 2 and they looked ok, I didn’t bother with 3. The reason being that the codes said that all 3 were misfiring and I now know that it’s not because of the plugs. So then I swapped the coils between 1 and 4 to check to see if I could tell if #1 coil is bad, but when I go to crank the car, it was dead. I charge my battery over night. This morning it cranks right up and sounds fine and since the dead battery cleared the codes, I ran the quick scan to see what it would say. It only came back with 2 totally new codes. The one for the car seat heater switch and another for the AC. Then I drove it about 18 miles to see if they’d come back on and so far they haven’t. Several hours later and I just did a full scan with the Blue Driver and it’s still not giving any new codes. So I cleared the heat seater and AC ones that had popped up (they work fine) and I’m guessing a bad or slowly draining battery caused all of this weirdness. I think a new dashcam I recently got and had plugged in must’ve actually been draining the battery just enough that it could’ve done this. I had forgotten to unplug it. The car battery isn’t that old. Is it possible for a battery to make random codes pop up that you think are in error or is there something more serious going on?

[fjones]

I guess I know what I'll be doing tomorrow.
Thanks for the video.

[JJ-njpd]

if you have questions, you can also email them with your question and your year/model of vehicle, and they kindly reply to you within a day or two.. done that and always found my answer. great product it is! Mini cooper '06.

[goliath]

Love the Canadian accents it makes me giggle you guys know what I’m talking about. Thanks

[oliverbooker]

Great video. Very helpful. Straightforward and clear. Good job, you guys! Oh, BTW, BlueDriver works fabulous!

[andyconsolo]

This blue drive really works well but it didn't tell me I had a broken spring on the exhaust valve that was my Miss on number 3

[DavidGomez-wsbr]

Extremely well video I learned so much thanks.

[rdpig]

I'm curious why a $120 Launch scanner can read misfires on my 2003 Cadillac Deville DHS but the Bluedriver can't? Also, the same Launch scanner can read the ABS code on my 98 Jeep Grand Cherokee but the Bluedriver can't? Also, my Bluedriver keeps telling me there's an update but after doing the update it's still the same version.

[toomanynarcissistshere]

GREAT VIDEO! Thumb's up and subscribed, also bought the BlueDriver. Just pissed that I was not able to save many many thousands of dollars by being able to type this comment back in 1987, when I got my first used car. Yas don't know lucky yas are :-(