Engine misfiring, codes P0301, P0302, P0303, P0304, P0305, P0300

LEEWAGS

MEMBER
2003 HONDA ODYSSEY
3.5L
6 CYL
2WD
AUTOMATIC
200,000 MILES

I recently had the engine light turn on in my van.

I ran a test and got the following codes P0301, P0302, P0303, P0304, P0305, P0300. That's Cylinders 1-5 Misfire Detected and "Random/Multiple Cylinder Misfire Detected". I also, occasionally notice a gas smell. I just replaced the Coil Packs and Spark plugs myself Fall 2018.

I doubt all my spark plugs have gone bad in six months and don't know what's causing the smell. Any thoughts as to the issue?

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1 Reply

SEVAG P

MECHANIC
405 POSTS

Hello thanks for using 2CarPros.

If random miss fire occurred then it seems you have fuel pressure problem. check the fuel pressure when driving must be between 280 to 330 kpa (41 to 48 psi) check the table fig 1.
Remove fuel pulsation damper connect the fuel pressure gauge.(fig 2)

Check our guide for fuel pressure check:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the fuel pressure is lower than the given value replace fuel filter then recheck.
Please send us feed back what happens with you.

Thank you.

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