sinclairgraphics1

So I've done a major tune up to my 2004 f150 lately with 147,000 miles. New plugs, coils, fuel filter, mass airflow sensor, throttle body cleaning, oil change, and transmission flush. While my truck it running better than it was, I'm still having an issue with the motor "bogging down" when I give it a little gas. If I hit the pedal harder, it goes out of it. Usually happens at highway speeds or going up a hill. It doesn't feel like a misfire and also the rpms do not change at all.

So I read on here people had similar problems and flashing the PCM seemed to help. I just called the Ford dealer and told him about this and he seemed perplexed as to why I'd want to do this? I did have the battery unhooked a couple weeks ago and also took the computer off when I was getting to the plugs. Anyway, any suggestions before I let the dealership screw me??

atikovi

Fuel injectors dirty? TPS bad?

natem

Are all o2 sensors good?

sinclairgraphics1

I'm going to put some sea foam in and see if that helps out. I don't think it's the Throttle Position Sensor because the rpms aren't bouncing. The motor sounds like it's in a different gear or something when it makes the bogged down sound. Like it's starving for fuel.

sinclairgraphics1

not sure, doesn't a light come on if they are bad? All I know is I keep dumping money into this mother#*%#** every chance I get. I've only had it about a month and there's always some issue...every singe day with this truck. Not a fan of it right now.

atikovi

Don't know what sea foam does but the only way to properly clean the injectors is to remove them and send them out to an ultrasonic cleaning service.

0hsiks_crewcab

Bad O2s won't necessarily set a light they could be getting lazy and when you smash the pedal they will respond better. O2s like to be in a certain range as long as the mid point of their cycling is in range it won't show any code or throw an idiot light but if they are lazy the cycling midpoint can still be the same saying everything is fine but can hurt performance. If you have done all that O2s and injector cleaning would be the last to do. Good luck.

otto457

Pressure test the cats would be my first thing to do. Stay away from Seafoam and other feel good smoke in a can.

techrep

iTrader: (1)

Fpdm....

Especial86

iTrader: (1)

Damage to the foam seal for the air filter.