Scratching my head over po174
02-14-2012, 08:13 AM
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Scratching my head over po174
Hi all, well, i had a lean 1 bank 1 code and changed out o2. no problems. I got some money back from the Gov. and decided to add magniflow to replace the rusted out flowmaster. No problem. Added k and n CAI.....PROBLEM!!! I run a edge evo and found they are not compatible so I got the Diablo tuner that has a setting for K and n filter. Truck runs fine but when I get on it 
it spits and pings and throws the bank 2 code with the random misfire and no others. I see from other threads that it prbly isnt MAF. Service bulletin says otherwise. Oiled K and N? Vacuum leak? Intake manifold? Fuel pressure? 
F150 2004 5.4 supercrew
it spits and pings and throws the bank 2 code with the random misfire and no others. I see from other threads that it prbly isnt MAF. Service bulletin says otherwise. Oiled K and N? Vacuum leak? Intake manifold? Fuel pressure? F150 2004 5.4 supercrew
Last edited by gusgus36; 02-14-2012 at 08:19 AM.
02-15-2012, 08:26 AM
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update
I cleaned the MAF, checked for vacuum leak and did not find one. I checked my long term fuel trims and bank 1 and 2 are really far apart most of the time. Could this be a fuel injector problem or a bad C.O.S? please any help would be apreciated!