Sneak peek into what one can learn in Brandon Steckler's classroom!

Mario Diagnostician Florida Posted   Latest   Edited  
Case Study
Driveability
1998 Jeep Grand Cherokee Laredo 4.0L (S) 4-spd
P0302 — Cylinder 2 Misfire Detected

I'd like to share a preview as to what one can learn in Brandon Steckler's classroom. Of course, there's no way a YouTube video can compare to a full-on training class! But for those who have never attended, this is the vibe, knowledge, experience, and detailed delivery you can expect, should you attend. I've personally been to his class at Super Saturday, thanks to Trained by Techs, and was blown away by these test methods, and haven't looked back since! 

I believe he will be at Super Saturday this year. Be sure to check out: paautotraining​.​com 

Enjoy! Feel free to leave a comment, question, support, or concern!

youtu​.​be/smSdJG_LC2w

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Rudy Technician
California
Rudy Default
   

Does Pico not have a "smoothing" feature,like EScope? I honestly am having somewhat of a hard time picking out the bad cylinder because of the noise(Limited experience with this type of testing plays into this too) Great video, BTW.

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Mario Diagnostician
Florida
Mario Default
   

Yes pico has both vertical enhancement and also filtering. It sure helps knowing the source of the noise(starter health). But also the signature that usually accompanies a low compression cylinder is that it's following compression peak will result in a raised amperage. Also, as Brandon, mentioned its always good to get a stabilized crank waveform, at times you'll see a more consistent fault…

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Rudy Technician
California
Rudy Default
 

Oh I was looking at the peaks of the "noise" Thats why I was having a hard time. Your illustration here was excellent!!

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Chris Diagnostician
Maryland
Chris Default
 

Great video. It was helpful for a chart that can be confusing at times. If cylinder 2 is the problem cylinder then what is happening that it is affecting cyl 5 intake pull Thanks

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Mario Diagnostician
Florida
Mario Default
   

In this waveform I placed a black line to visually separate the intake from the combustion chamber. We know that the only thing separating the two are intake valves. You can see that number two compression is shown to be low on the amperage waveform. looking at the piston chart, one can line up its corresponding compression and power stroke. Now the weak intake pull is happening during cylinder…

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Chris Diagnostician
Maryland
Chris Default
 

Thanks for the help!

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Mario, I hope you don't mind me playing a devil's advocate, but if the leaking pressure from cylinder 2 is able to cancel a third of the #5 intake pull, why doesn't it boost the preceding peak by the same amount?

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Marlin Technician
Oregon
Marlin Default
 

Exactly what I was thinking.

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Mario Diagnostician
Florida
Mario Default
   

Great question. Now I am no expert. But the way I see it is, from number one EVC to the maximum intake pull duration(the valley following it) takes up about a third of its respective blue "induction" stroke(the sensor's "perceived" intake), and also only a third of the number 2 compression stroke. I think about that leaking intake valve, and I can't visualize the leak having the same effect to…

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Mario, note that I am talking about the peak immediately before the #5 intake pull, and not about the #1 intake pull (for which you have a good explanation).

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Mario Diagnostician
Florida
Mario Default
 

I'll simplify my explanation this time around. 😆 now I'll be honest, I was thinking about this, but there are times I will ask those I'm learning from. So I reached out to Brandon. And he knocked some sense into me lol simply put, although the number 2 is leaking into the intake, number 5 intake valve is still open(overlap), also number one intake valve is also open still. The sensor is reacting…

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Thanks! I guess the size of the leak really matters for this to work as seen on the waveform. Would love to know how big the leak is... Could you do a leakdown test (cyl #2) for this vehicle? I've got 2 DNTs in hand! 🤑

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Jim Mobile Technician
Pennsylvania
Jim Default
 

GREAT example of the "P"s and the "G"s diagnostics. By performing General area testing first , it will put you into the correct FUNNEL, then by performing Pinpoint test, it will have you driving down the Funnel to the actual concern and the "Root Cause". GREAT DIAGNOSTIC Procedures by BOTH of you.

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Mario Diagnostician
Florida
Mario Default
 

Thanks Jim!

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Ray Diagnostician
Ontario
Ray Default
 

Mario, excellent video as usual! I'd like to add that I've had many mechanical cylinder misfires where the relative compression test will not show a problem, and a pressure transducer in the intake or in the tailpipe or on the dipstick tube will show the problem. This capture is from a 2016 Dodge Charger 5.7L and cylinder 1 only misfired at WOT. CH A is COP 1, CH B is the relative compression…

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Mario Diagnostician
Florida
Mario Default
 

Ray, thanks! That's a very good point! Also thank you for sharing the waveform. I'll take a look at it when I get to work tomorrow! I, for one, cannot say I've had one of these. Sure makes me want to evaluate my diag process.

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Joel Diagnostician
California
Joel Default
 

Nice demonstration, goog thing is misfiring cylinder is identified ready as being number 5 at least by scan data

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Mario Diagnostician
Florida
Mario Default
 

Where was a cylinder 5 identified in scan data?

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Joel Diagnostician
California
Joel Default
 

I watched the video twice what a good tutorial , I have been on Brandon class one time but any time he will be in my area I am registered. thanks to both of you guys

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Mario Diagnostician
Florida
Mario Default
 

No problem! Thanks

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Bill Owner/Technician
Michigan
Bill Default
 

Keep up the good work! And thank you for taking the time to show others your techniques.

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Mario Diagnostician
Florida
Mario Default
 

Thanks Bill!

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Mark Mobile Technician
Vermont
Mark Default
 

Great video SM and Brandon. Thanks

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Mario Diagnostician
Florida
Mario Default
 

No, thank you for watching!

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Chris Diagnostician
Pennsylvania
Chris Default
 

Great work Mario and Brandon. This is why it is great to leverage so many different platforms to expand the awareness of various diagnostic techniques. Great exposure for a lot of techs (and potential techs) as well as a demonstration of how various methods can save us a lot of labor and help us sell complex and expensive jobs more confidently (when we are more confident, the customer is more…

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Mario Diagnostician
Florida
Mario Default
 

Well said Chris! This is definitely one of those methods the end user will greatly benefit from. If they don't get a sample or ever see it, how would they know? I sure didn't! So I hope we were able not only to get the viewers familiar with these techniques, but also get their appetite whet for these diagnostic methods, so that they may search for more. Thanks Chris for watching and taking the…

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