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post #1 of 5 (permalink) Old 08-15-2019, 10:11 PM Thread Starter
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Misfire Issue

Hello! I’ve got a 2011 5.7l Rock Warrior with about 88,000 miles. I take excellent care of my truck but have had a random misfire for several months now. About once every 3-4 weeks when I first start the truck in the morning it will idle rough to where I can immediately tell it’s misfiring, and after a few seconds the check engine light will come on. This has been accompanied by the traction control light and 4lo flashing on some occasions. Sometimes if I turn the truck off and on it will idle normally again, other times I’ve had to leave the truck parked for a day or so and when I start it again it idles normally. After it does this a time or two it’ll run completely fine for another several weeks until it happens again.

I have a code reader and get the same code, P303 each time so the misfire is always in cylinder #3 . I swapped ignition coils to see if the misfire moved with the coil and that made no difference. I replaced all the spark plugs and again, this didn’t fix the issue. Finally I replaced the fuel injector for that cylinder and again this did not fix the issue.

I had an appointment last week with my local Toyota dealer to take a look at the truck and they told me to reschedule and come back when their shop foreman was in because with all I had done already they were more or less clueless.

Anyone else have an issue like this? Any help diagnosing what the potential issue could be would be greatly appreciated.
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post #2 of 5 (permalink) Old 08-16-2019, 11:12 AM
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Next step would be a compression and leak down test

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post #3 of 5 (permalink) Old 08-22-2019, 02:05 PM Thread Starter
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Might have forgotten to mention but compression was tested the first time the truck was brought in and was fine. No coolant on the plug and coolant level has never gone down. The truck has been at the dealer for the last several days now. They have been telling me they have their most experienced techs working on it and are still having a hard time pin pointing the issue. When it’s hooked up to their computer they can see a misfire in multiple cylinders and it varies from start up to start up as to which cylinders it is. However it’s not enough to cause the engine light to come on while they’ve had it. They think it might be a fuel issue but ran a cleaner through the injectors which hasn’t solved it.
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post #4 of 5 (permalink) Old 08-22-2019, 03:30 PM
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fuel pressure issue?
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post #5 of 5 (permalink) Old 08-22-2019, 03:39 PM Thread Starter
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Possible, although I would think their computer would indicate if the pressure was low and they’ve made no mention of that. Up here in AK the gasoline quality is less than in the lower 48 however I’ve never had any issues with other vehicles in the past with significantly more miles than this one.
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