Code P1408?

REDBONE

MEMBER
2001 FORD RANGER
4.0L
V6
4WD
AUTOMATIC
175,000 MILES

I had code retrieved and they told me to replace EGR. I replaced EGR and no change, still got p1408.I then put on a new solenoid and dpfe and still get code. Also #5 misfire, new plugs coil and wires still misfire, could injectors cause the misfire?

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,366 POSTS

Hi:

Absolutely, a failing fuel injector can cause a misfire. There are several different things that can. For example, weak fuel pressure, an engine vacuum leak, an issue with the air/fuel mixture resulting from a failed oxygen sensor, and the list goes on.

As far as the code, it is related to the EGR. When you replaced it, was there any carbon or debris in the intake that can be causing a restriction? Also, have you checked for a vacuum at the EGR?

If you have a vacuum gauge, try this. Engine Running (KOER) Self-Test while monitoring gauge. Approximately 30 seconds into the test, EGR flow will be requested for a few seconds. The vacuum at this time should increase above 5.4 kPa (1.6 in-Hg) to open the valve.

You will need a vacuum gauge to do this. If you don't have one, most parts stores will lend one to you. Do this so we can eliminate a vacuum issue.

Let me know what you find.

Take care,

Joe