Throwing a code

[gw33gp]

I am getting a code of P1401. The last time I got that I installed a new Motorcraft DPFE sensor and the code did not come back. So, I did I did the same thing again this time and the code came back. Any suggestions for what else I should check out to get rid of this code?

When I am on one of my performance tunes, I don't get the "check engine" light and no code. I always use the stock tune for emissions test because I don't know if it would pass on a performance tune. I may have to try the performance tune this time if I can't figure out what is throwing the code.

 

[franklin2]

Are the hoses leading to the new sensor clear? Does the engine stall if you manually open the EGR at idle? It should. If it doesn't, the exhaust pipe leading to the EGR could be clogged.

 

[gw33gp]

I will check those things. Thank you for giving me some diagnostic guidance.

 

[gw33gp]

I checked the two hoses leading to the sensor by connecting a tube to them and blowing through.
Both had no restriction. However, the rear one made a sound kind of like something lightly popped out of it when I blew on it. I blew on it again and it did not make the sound again. I also manually opened the EGR valve with vacuum to the valve controller, and found it would stall the engine at idle.

I then connected a vacuum gauge to the line that goes to the EGR valve. I put the gauge in my cab and went for a drive. I could see the vacuum was functioning properly to activate the EGR valve. I then connected everything as it should be and cleared the codes.

Since then, I have driven my Ranger three times with no code being thrown except for the P1000 which is normal and should eventually clear itself. Before, it would throw the P1401 code soon on the second drive.

It appears the rear tube to the DPFE sensor was plugged and once I blew it out, the problem was solved. I just hope that whatever it was that was plugging the rear tube does not move up to plug the EGR valve.

 

[franklin2]

The EGR is famous for that also. Just like when you opened it manually and the engine stalled, if it gets a piece of dirt in it and it holds it open, the engine will run very rough and may even stall at every stoplight you come to. You can pull it off and blow it out also.