P0172 - Page 2

F150 Man 4Eva · #11 Wed, February 9th, 2011, 09:48 PM

So, I haven't seen the CEL and code for a while now. At the rate that it was starting to be thrown, I would assume that I would have seen it again by now. I did make one change.... I have been running Lucas fuel system/injector cleaner for the past 2 full tanks (which takes me a while to run out). It has definitely helped my MPGs, and I don't know if it's just a coincidence, or if it has helped keep the code away.?.?.? I did notice something a little disturbing to me the other morning though. On initial crank up, a big puff of black smoke came out the exhaust..then turned to white smoke and continued for a few seconds before stopping. I had never seen that before. It did seem like from time to time that I would smell a little something when I would initially start up, but I never actually saw the smoke like that.

hampsterzone · #12 Thu, February 10th, 2011, 10:12 PM

The first thing I ask is: have you changed your spark plugs, spring caps, and coil packs? When the smoke came from my truck it was from a misfire on one of the cylinders due to spark failure. It happened to me again with a flashing check engine light when the coil pack went out. It can't hurt to change them before you must. Change everything you can afford to change. Besides, you are suppose to do them as part of regular maintenance. It is better to pay a little than a lot plus down time related to the costly repair. Hope you figure it out. Good luck!

***88Racing*** · #13 Sun, February 13th, 2011, 07:00 PM

Quote:

Originally Posted by hampsterzone

The first thing I ask is: have you changed your spark plugs, spring caps, and coil packs? When the smoke came from my truck it was from a misfire on one of the cylinders due to spark failure. It happened to me again with a flashing check engine light when the coil pack went out. It can't hurt to change them before you must. Change everything you can afford to change. Besides, you are suppose to do them as part of regular maintenance. It is better to pay a little than a lot plus down time related to the costly repair. Hope you figure it out. Good luck!

Ford recommends plug changes at 60k now....