05 F150 misfire problem
I have an 05 with the 5.4 3valve. A couple weeks ago we filled up the truck and my boat motor at the same fuel stop. Both my truck and my boat motor started to run crappy. It was getting a misfire on 5 and 8 and lean on bank 2.We took the truck to our mechanic and they replaced the plugs and fuel filter. Still has the misfire. We've had the truck to 3 different mechanics noone can pin point it. Here is what I have done and had done. Compression check good. Fuel pump pressure good. Coil test good. Replaced the fuel filter. Pulled the fuel rail and checked for leaking or plugged injectors, they are all good with good even spray. Checked for vacuum leaks found none. MAF sensor cleaned. Checked PCV valve and hose its good.
The code its pulling is the p0174 lean on bank 2. All other codes have gone away. It idles a little rough but it has NO power at all. Seems to misfire worse at low RPMS (i.e. in over drive at around 50 mph). Under any load at all it misses bad too. I am at a loss for ideas here. O2 sensor? Catilatic Converter? MAF sensor? TPS? Any help would be great. I have searched these forums and have tried all I have read. Thanks for any advice.
Last edited by hdodt; 07-11-2010 at 12:11 AM.
Reason: add info