P0300 F-150 2006 XLT 5.4 ( Random Misfire ) - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 7 (permalink) Old 02-15-2015, 10:16 PM Thread Starter
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ECU Code P0300 F-150 2006 XLT 5.4 ( Random Misfire )

Hey guys!!

First of all i have just one code now which is P0300 ( Random Misfire ) At the begaining of the week i pluged my computer and i had P0171 - P0174 - p0307. What i did is i swaped the coil on my cylinder #7 to the #5 to see if my P0307 where to change to P0305 which happen so i got a new coil and put it on my cylinder #5. Go for a ride with the truck and i had the same problem which is the engine start running pretty bad over 3000RPM and dosen't have much power when i drive it but runs fine when it's in neutral and no problem to rev up just like i want. Over 3000Rpm or so i don't have much power and it jerking just like if the engine want more fuel. After i erase the codes If i drive it normally no code come up. The code just appears if i hold the accelerator wide open for 5 to 10 seconds when driving it. At 100Kmh on the highway the truck seems to run fine and it's does not using much more gas.

Last edited by husky601; 02-17-2015 at 10:14 AM.
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post #2 of 7 (permalink) Old 02-16-2015, 06:45 AM
 
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Welcome to fordtough.ca, home of the Canadian F150 (and Ford) enthusiast.

I'm no expert, but sounds like you're starving for fuel, check the usual suspects, gas filter, maybe water in the gas, throw in a bottle of gas line anti freeze, and then go from there.

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post #3 of 7 (permalink) Old 02-16-2015, 05:55 PM
 
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Welcome and read this. http://www.aa1car.com/library/ford_lean_codes.htm

Such is life. Just passing through.

04 F150 FX4 Screw 5.4 with couple of mods
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post #4 of 7 (permalink) Old 02-16-2015, 06:02 PM Thread Starter
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Thanks for the advise but P0171 & P0174 are not there anymore. SVT4M thanks and i think i am gonna change the fuel filter and water in the fuel is possible because the truck was park in my parking for 2 years or soo. I changed the trany because i had no reverse but when i got it from the Auction in Alberta it was running fine and at some point i just start to move it and i noticed it was running rough on iddle, i clean all the coils and replace 1 of them and now it seems to rund great on iddle. Thanks!!
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post #5 of 7 (permalink) Old 02-17-2015, 07:19 PM Thread Starter
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I just realize something. I was driving tonight and it was pretty icy so i tried to hit the throttle and i can hit the rev limmiter if i want just like normal. Same on neutral without any hesitation. Don't know but i think it will be a fuel issue. I changed the fuel filter and put gas line on the tank today but i don't think it made differance.
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post #6 of 7 (permalink) Old 02-18-2015, 04:16 AM
 
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Well, there's two you can check off the list anyway, and probably didn't hurt. lol

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post #7 of 7 (permalink) Old 02-22-2015, 10:41 PM
 
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Lean codes on both banks don't come up for no reason. Verify first whether it's a lack of fuel or unmetered air. The way that you describe a lack of power at high engine speed points toward fuel. Unmetered air should give a rough idle.

Drive it with a fuel pump gauge plumbed in at the rail. I bet it will fall flat on its face when you stomp on the throttle going up a hill.

Fuel pumps are common, and so are fuel pump driver modules. The FPDM receives the fuel demand signal from the PCM and then uses a pulse width modulated internal relay to complete the circuit to the fuel pump. Due to FPDM location it's very common for eastern trucks to have it eaten away by salt and debris, or for its ground to be corroded.

Happy hunting.

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