How should you go about changing an EGR Valve in your 98 Expedition and where is it located?
4.2L, 4.6L, 5.4L and
6.8L Engines 1. Disconnect the negative battery cable. 2.
Remove the vacuum hose from the EGR valve. 3. On the 4.6L engine,
remove the nut and brake booster bracket. 4. On the 5.4L engine,
remove the DPFE sensor retaining nuts and place the sensor to the
side to allow access to the EGR tube. 5. Disconnect the EGR
valve-to-exhaust manifold tube from the EGR valve. 6. Remove the
EGR valve mounting bolts, then separate the valve from the intake
manifold. 7. Remove and discard the old EGR valve gasket, and clean
the gasket mating surfaces on the valve and the intake manifold.
To Install: 8. Install
the EGR valve, along with a new gasket, on the manifold, then
install and tighten the mounting bolts. 9. Connect the EGR
valve-to-exhaust manifold tube to the valve, then tighten the tube
nut to 25-35 lbs. (34-47 Nm). 10. Connect the vacuum hose to the
EGR valve. 11. On the 5.7L engine, install the DPFE sensor. 12. On
the 4.6L engine install the brake booster bracket and the retaining
nut. 13. Connect the negative battery cable.