2011 Ram 1500 5.7 Liter Misfire

Bernie Diagnostician New Mexico Posted   Latest  
Case Study
ATS - Automotive Test Solutions
Driveability
2011 Ram 1500 Laramie 5.7L (T EZH) 5-spd (545RFE)
Misfire
No Codes

Here is a case study that I have just completed. This Ram 1500 has a misfire that has had a lot of parts installed trying to fix it, I hope this helps.

diag​.​net/file/fd5lw3xjg…

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Thanks
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Steve Diagnostician
Arkansas
Steve
 

Wow, you are the mastermind of in cylinder pressure diagnostics ! Could carbon be causing the rings to stick in their grooves and not seal?

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Bernie Diagnostician
New Mexico
Bernie
 

Steve That could be a possible cause, but usually the oil ring is the ring that will get stuck with carbon or sludge. This engine was over heated and damaged the piston and cylinder bore.

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Donald Owner/Technician
Georgia
Donald
 

So Kool Mr. Thompson, thanks for all you do. I have gained more knowledge from watching your case studies, it makes all the years of trial and errors fit like a puzzle. Thanks again.

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Ray Diagnostician
Ontario
Ray
 

Thanks Bernie!

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Spiro Service Manager
New York
Spiro
 

I am always learning something new from you Bernie. Thank you for taking the time to share with us!

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John Owner
California
John
 

Thank you Bernie. I learn something every time you post and i look forward to the next case study you publish. We're building a new diagnostic cart and training the team to think like you. We'll be equipping the cart with your tools.

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Dan Owner/Technician
Kansas
Dan
 

Thanks Bernie! The information you share with us is greatly appreciated and invaluable to us average Joe's.

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Darren Mechanic
Wisconsin
Darren
 

Outstanding!

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Justin Mechanic
Tennessee
Justin
 

[REMOVED]

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Bernie Diagnostician
New Mexico
Bernie
 

Justin The fuel trim was -7% on bank 2 and -17% on bank 1, this is a difference of about 10 %. The fuel was in control switching states from rich to lean , and from lean to rich on both banks. The misfire was not a dead miss as seen by the mode 6 data. If the cylinder was rich enough to wash the rings out there would be a greater fuel trim difference between the two banks. However a great test…

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Justin Mechanic
Tennessee
Justin
 

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Olle Instructor
Minnesota
Olle
 

Great! IMHO. The asymmetry in the pressure waveform along with the lack of valve train problems also points to a ring/piston/cylinder sealing issue, just like the crankcase pressure waveform indicated.

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Justin Mechanic
Tennessee
Justin
 

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Olle Instructor
Minnesota
Olle
 

In the video it appears and is mentioned that the PCM shut off the injector. I wonder what effect that would have on a fuel wash issue.

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Justin Mechanic
Tennessee
Justin
   

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Bernie Diagnostician
New Mexico
Bernie
 

Olle The ECM did not stop the control of the injector, the ignition coil was shut off due to the resistor that I placed in the circuit to replace the ignition coil. During the normal operation of the engine it did not stop the control of the injector or ignition coil.

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Olle Instructor
Minnesota
Olle
 

I missed that! Thank you!

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