SOLVED P1399 Honda Acura V6 Accord Odyssey Ridgeline Pilot CL TL MDX Random Cylinder Misfire

Honda Acura P1399 Solved Random Cylinder Misfire Detected. This is an in-depth look at the honda Acura J Series V6 engine with a P1399 code as well as P0300 P0301 P0302 P0303 P304 P305 P306 and P1399. At first I thought it was burnt valves but after some research realized it was not a very common problem for these J Series to have burnt valves. A engine needs 3 things to run correctly. Fuel, Compression Spark.

I check for compression on all 6 cylinders. Normal compression for these engines is 130PSI to 165PSI. All cylinders checked out.

Checked for spark, with the spark plugs and coil packs attached I pulled the connector to the coil pack and listened for a change in engine RPM, as you pull each connector you can hear the engine fall on it's face a little bit more. Do this for all coil packs until you come to the one that does not make a difference. Once you isolate that coil pack pull up on the coil pack and see if you hear spark. If you hear spark then most likely, it's fuel related.

I swapped fuel injectors to make sure the dead cylinder moved with the fuel injector and it did.

The key thing to remember is that you start with a compression test on an engine, you need to know the health of your engine before proceeding forward.

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