I've got my father-in-laws Ford Ranger this week while they are on vacation, and the check engine light is (has been) on. My father-in-law says that he took it somewhere and they said it was an "emissions thing". Don't worry about it.
Well, I'm not that way with my vehicles, so I put my CarChip on and ran diags. The code that comes up is: P0401 Exhaust Gas Recirculation Flow Insufficient Detected
I took the EGR off and cleaned it up, reset the light/codes and took it for a drive (about 12 miles. A block from getting back the light came on again, same code.
I purchased a new EGR valve tonight, installed it, reset the light, and drove the same "test route". About 6 blocks from the house it came back on.
I also pulled one of the spark plugs tonight and it looks oiled/sooty. And overgapped. I figure the truck is running rich with the current problem which would account for the "oiled" look, and I noticed the plug wires are looking pretty worn/cooked. I have new plugs that will work in the truick and will get new wires tomorrow. - I doubt that will fix the problem though.
I'm open to ideas guys and gals.
The truck has the 3.0 liter V6, automatic trans, and 126,000 miles on it.
My in-laws come back Saturday am, and I would like to give the truck back in a little better shape than the left it. They really do a lot for us, so I don't mind spending some time and a few dollars on it.
Wednesday, March 25th, 2020 AT 1:36 PM