I have 02 F250 7.3 diesel. Recently installed K and N intake. Runs great fuel mileage improved however after having it on for about a week my emission light is now on. I read many threads talking about oil getting on MAF and creating this problem...where can I find the MAF? Does anyone have a picture to post showing what and where it is? Any help will be appreciated!
Welcome to FTE. Having the exact code would be helpful. Not all code readers are compatible with the 7.3 (ignore all those 96 and up claims). Maybe you mean the MAP instead of the MAF?
Also, pay very, very close attention to the inside of the intake tube between your new K&N and the turbo. The first time you see any signs of dust in there, switch to a different filter. We've read about several dusted turbos and even dusted engines because the K&N does not filter well enough in front of our turbo.
So do you have an Excursion or a California emissions package truck? Glow plug #6 is the 3rd one back on the driver side. To see if it's actually a glow plug issue, find the long flat connector on the inboard side of the driver side head and unplug it (engine off). Grab a multi meter and set it to read ohms. There will be 9 flat pins inside the connector at the valve cover. Counting from the front, test pin #8 (2nd to last) against a battery ground. A reading of less than 2 ohms means a good glow plug.
If the glow plug reads good, then you've got either a wiring or GPCM issue. If the glow plug tests bad, you've got either a wiring or a glow plug issue. The GPCM is more expensive, but much easier to replace.