Econoline E350 Emissions - Intermittent Rough Idle Condition
EGR Valve: All Technical Service Bulletins
Emissions - Intermittent Rough Idle Condition
TSB 05-4-17
03/07/05
INTERMITTENT ROUGH IDLE - NON-COMMANDED
EGR FLOW
FORD:
1997-1999 F-250 LD
1997-2004 F-150
1997-2005 E-Series
1998-2004 Expedition
1999-2004 F-Super Duty
2000-2005 Excursion
LINCOLN:
1998-1999 Navigator
ISSUE
Some 1997-2005 5.4L 2V vehicles may exhibit an intermittent rough idle. This may be due to non-commanded EGR flow.
ACTION
EGR flow can be detected by comparing the stabilized DPFEGR KOER voltage (from NGS/WDS) at idle after manually opening and closing the EGR
valve through 8 cycles. Record the DPFEGR voltage after each cycle. If the DPFEGR voltage increases by 0.03V or more from the stabilized idle
voltage and is associated with a rough idle, the valve should be replaced. Refer to the following Service Procedure.
SERVICE PROCEDURE
1.
Connect NGS/WDS and monitor DPFEGR PID.
2.
Record initial stabilized DPFEGR voltage.
3.
Disconnect the EGR valve vacuum line and connect hand held vacuum pump.
4.
Raise RPM to prevent stalling and fully open the EGR valve.
5.
Fully close valve and return to idle.
6.
Record stabilized DPFEGR voltage.
7.
Repeat Steps 4-6, eight (8) times.
8.
If voltage increases by 0.03V or more with an associated rough idle condition during any of the cycles, the EGR valve may be sticking. Lightly tap
the EGR valve casting and observe if voltage returns to initial DPFEGR value.
a.
If the DPFEGR voltage returns to the initial value and the associated rough idle is gone replace the EGR valve.
b.
If there is no change in DPFEGR voltage do not replace the EGR valve and perform normal diagnostics.
9.
If the EGR valve is replaced repeat Steps 3-6, two (2) times to verify fix.
Parts Block
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
OPERATION
DESCRIPTION
TIME
050417A
1997-2005 Econoline 5.4L
0.9 Hr.
