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Paulson's avatar
Paulson
Explorer
Sep 23, 2021

V10 misfire codes

We recently purchased a 2016 Fleetwood bounder with a Triton V10. On the way home on a 20 minute drive, the check engine light started flashing. Codes were P0300, P0302, and P0306. Since then on various test drives, it has popped all of the even numbered misfire codes 02 thru 10. It has never popped an odd numbered misfire code. Found out about a TSB, so took it to the Ford dealership to have the PCM software upgraded. However they informed me I already have the upgrade. We have replaced all 10 spark plugs and coils. I have checked the PCV valve hose for leaks. I have replaced the MAF. The check engine light will typically flash after having been under load, and then I back off on the Accelerator So after going up a hill, it will not flash until I take my foot off the gas, and then it will flash going down the hill. I am stumped, especially considering it only pops even numbered misfire codes. Any input would be appreciated!
Class A
  • path1's avatar
    path1
    Explorer
    Sep 23, 2021
    I have a little brother a 5.4 I had problems with mine throwing codes after chasing down all the stuff and getting injectors cleaned excetera excetera neighbor asked when last time I cleaned throttle body, found something on YouTube followed it and fixed the problem. Also I checked all electri connectors up near the throttle body maybe there's something to do with that also not sure
  • theoldwizard1's avatar
    theoldwizard1
    Explorer II
    Sep 23, 2021
    You need a code reader that can access "live data". Shooting the parts cannon gets expensive quick.

    First thing to look for (besides the misfire) is short and long term fuel trim. I'll bet he side still misfiring has a large positive long term trim. This indicates an air leak. If only on one cylinder it could be a bad injector.

    Stop shooting from the hip !

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