2011 Nissan Sentra - Cylinder 1 Misfire Diagnosis

This car has been an ongoing intermittent misfire issue for our client. A previous shop installed new ignition coils and spark plugs but the problem still existed. Although ignition coil failure is not uncommon, this vehicle proves that proper time spent diagnosing the problem is crucial. The oscilloscope waveforms were normal even while the engine was misfiring which led me to the fuel system. Maybe next time I will video the procedure for relative compression using the oscilloscope.
As always, we hope these videos are helpful to the DIY, our current clients and potentially bring us new clients.
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[waitingforparts]

Hope all is well. Missed seeing you these past weeks.
Keep safe

[josefranciscoesquertalaman]

Excelente video cordial saludo desde Navojoa Sonora México

[wilt]

Thank you thank you thank you.
I mixed up cylinder 1 and 4.
Cylinder 1 kept giving me the code but the injector on no 1 has the same issue with the tab but I thought it was cylinder 4.
Thank you lol

[waymenlawrence]

Small zip tie would of been faster easier and saved the customer money

[jamestorres]

Great video. But I would have recommended all 4 injectors aftermarket cheap ones because of fuel mileage improvement. Since you have everything apart already. New injectors cost a fortune.

[coreycollignon]

for the low low price of one zip tie id had fixed that for pennies hard to beat an oem injector. ive literally done this to mine

[damiancastillo]

Why would you skip the part of you taking the manifold off? This is a part people need to see.

[islandbeaches]

Not enough fuel cause misfire too lean conditions. Nissan have the pump assembly in the tank with filter all related components. Intake manifold sit over the valve cover cheaply design consistently removing the 2 short bolts at the rear and the 5 at the front for repairs and maintenance.

[Kamal_AL-Hinai]

Those recent Nissan's are not reliable at all