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ECM · Engine

Misfires and fuel trims for Nissan and Infiniti engines

Misfires are the first sign of trouble with plugs, coils, injectors or compression. Canfiti shows them for every cylinder with a bank layout for V6 and V8 engines, next to fuel trims, fuel pressure and oil temperature.

What Canfiti shows

  • Misfires per cylinder

    Two charts: the current cycle and the average over 10 cycles. The second catches intermittent misfires that happen once every few minutes. For 6- and 8-cylinder engines the app shows the cylinder numbering by bank.

  • Fuel trim

    Short- and long-term trim for bank 1 and bank 2. Normal is ±10 %; plus means the unit is enriching the mixture. Colors help: green is normal, orange needs attention, red is an alarm.

  • Fuel pressure

    Every pressure the ECU reports, plus commanded vs actual for the rail regulator with the deviation. Values the ECU does not support are labeled as such.

  • Oil temperature

    Engine oil temperature, if the engine unit reports it.

  • VIN and unit number

    The vehicle VIN and the engine unit part number.

A real case

After a long trip an Infiniti FX owner saw a huge misfire count in cylinder 1 in Canfiti, with almost none in the others. The cause was confirmed: the cylinder 1 ignition coil had burned out.

How many misfires are normal?

A few misfires are nothing to worry about: 4–5 per hour of driving is not alarming. Watch for a cylinder that clearly stands out on the 10-cycle average chart.

Guide: reading misfires and fuel trims

Verified on these vehicles

Misfires, fuel trims and fuel pressure are verified on the VK56-powered Infiniti QX56/QX80; the Nissan Patrol and Armada Y62 use the same engine.

It also works on many other Nissan and Infiniti vehicles with a CAN bus — connect and check. If it works, tell us and we will add your model to the list.

Step-by-step guides

Questions and answers

How do I find a misfiring cylinder on an Infiniti QX80?
Open “Engine” → “Misfires”. The misfiring cylinder stands out on the chart, and the bank diagram shows where it sits on the engine.

What does a positive fuel trim mean?
The engine unit is adding fuel — enriching the mixture. Usually it is a vacuum leak or a fuel delivery problem. Normal is within ±10 %.

Is there a cylinder diagram for four-cylinder engines?
No, diagrams exist only for V6 and V8: four-cylinder numbering varies between engines.

Does Canfiti clear the Check Engine light?
No, reading and clearing trouble codes is not supported. The app shows live engine data.