how do i find the problem and the vaccum diagram
Jul 19, 2010 at 9:48 PM
1998 Ford Expedition obd codes 171 and 174
1998 FORD EXPEDITION
ENG961
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MHPAUTOS
- ✓ASE Certified Mechanic
- 31,937 POSTS
Hi there,
Thank you for the donation.
These codes indicate lean mixture for both banks, so the first thing i would be looking at is the inlet manifold, i think we may be looking for something that is affecting both banks at the same time, a small vacuum hose off will not do this.
Mark (mhpautos)
Thank you for the donation.
These codes indicate lean mixture for both banks, so the first thing i would be looking at is the inlet manifold, i think we may be looking for something that is affecting both banks at the same time, a small vacuum hose off will not do this.
Mark (mhpautos)
Jul 19, 2010 at 10:00 PM
like what
Jul 19, 2010 at 10:13 PM
what am i looking for
Jul 19, 2010 at 10:20 PM
RASMATAZ
- ✓ASE Certified Mechanic
- 75,992 POSTS
Lean fuel condition can be caused by the following.
1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen sensor
Clean the MAF sensor and test the EGR-DPFE sensor
1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen sensor
Clean the MAF sensor and test the EGR-DPFE sensor
Jul 19, 2010 at 10:26 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.