Engine coils on the M56S

Forum for Infiniti M37, M56 M35h Hybrid and Q70 owners.
Menofgrace7
Posts: 22
Joined: Thu Jan 31, 2019 1:00 pm
Car: 2012 Infiniti M56 S

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There's an era code p0300 which states that there multiple misfires. Should I just replace all the coils and if so are they easy to do on this car?
Also where can I find the Denso coils 673 -4028 for under $40?


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Ilya
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Posts: 9800
Joined: Fri Apr 23, 2010 11:20 pm
Car: 2011 M56x but I spend a lot of time on my 2015 Kawasaki Vulcan S. Former owner of a 2007 M35x. Also take care of my wife's 2016 QX60.
Location: Charlotte, NC
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One test people do to test coils is while the car is idling to unplug them one by one (plug back in before moving to the next one). If the car idle doesn't change, that coil is bad. If the car starts to sputter, that coil is working. This was an old trick from the Maxima world that I've personally used.

Menofgrace7
Posts: 22
Joined: Thu Jan 31, 2019 1:00 pm
Car: 2012 Infiniti M56 S

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Ok cool thanks! Any suggestions on where to pick up the Denso coils if needed at a good price?

DFW2011M56S
Posts: 261
Joined: Sat Jul 23, 2016 4:48 pm
Car: 2011 M56S

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I started getting those codes on my 2011 M56S at about 85K. It was carbon buildup on the intake valves. I tied a couple of products that were supposed to get rid of it. It built up a very gummy deposit on the valves. I ended up yanking the intake and using a combination of B12, walnut shell media blasting and a small pick to remove it all. Took around 6 hours to do it all. I used a chemical cleaner into the pcv valve vacuum ports on the intake manifold every oil change after that. I had to change the starter solenoid at 140K. Valves were near spotless using the aerosal GDI valve cleaner every 5-6K.

Menofgrace7
Posts: 22
Joined: Thu Jan 31, 2019 1:00 pm
Car: 2012 Infiniti M56 S

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Wow ok. Thanks!


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