bturk

Could bad/faulty fuel injector(s) throw a P0172/0175 code on a 2007 F150 4.6L? The only symptoms I am having is a slight rough idle. O2 sensors, MAF sensor, spark plugs and EGR valve has been replaced.

elricfate

Moved to 2004-2008 forum to get more eyes on this.

gone postal

Clogged, not getting a good spray leaving unburned fuel in the exhaust? Possible.

BadFish523

Could be caused by a misfire too. Do you have the ability to read live data?

techrep

iTrader: (1)

Rich codes.. clogged would pop lean codes ... 171/174

redfishtd

Miles on engine? If you have enough miles over 100k then just replace them all if you don't have faith in them . Fuel is going to kill your cats . You can set up to test them with a small battery and resistor for spray pattern . Try you tube .

bturk

Would a misfire be due to faulty coils and/or injectors?

BadFish523

Either one could. Coils rarely ever go bad. Usually the connections on the coils need cleaned and need new boots and springs. I always recommend doing a cleaning and new boots and springs before changing coils. Most of the time changing plugs, cleaning coil connections, and new boots and springs will clear up a misfire.

gone postal

Not referring to a complete clog, but a semi-clog that screws up the spray, making a stream of fuel rather than droplets.

techrep

iTrader: (1)

Understand.. a non- mist spray