SOURCE: egr valve insufficient flow detected
You probably pulled a code p0401, insufficient egr flow. Your DPFE sensor is more than likely at fault. There has been a lot of trouble with these sensors. Then reset CEL or disconnect battery for 5 minutes.
SOURCE: where is the egr valve located on a 1999 silverado 5.3 vortec
try cleaning the inside of the MAF sensor with CRC brand MAF cleaner, it is availiable at any auto parts store for around $5
SOURCE: 1999 FORD EXPEDITION 2WD 4.6L EGR VALVE,EGR
Remove the throttle body housing on the top of the intake, it is a 90 degree tunnel like small piece held by 4 small bolts, turn it over and look for two holes, these holes are for the EGR valve flow, they are probably plugged up with carboned crud, clean them out with the tip of a screwdriver if neccessary to remove all the crud, once its clean reinstall it and reset your check engine light, hope this helps, let me know
SOURCE: How do I replace the
It is a relatively simple process. However, it depends on whether or not you have easy access to the EGR valve. There should be a wire plug connected to the top of valve...some models were on the side...disconnect the plug. Usually, there is a tube connected on the bottom. If that is the case, you will need to remove the tube. Use a wrench on the nut on top of tube just under the EGR valve. You may also need to remove one or two bolts that hold the valve in place. Each engine is different in the placement of the valve. Once valve is removed, installation of new valve is the reverse of removal. After installing new valve, be certain to reconnect the wire.
SOURCE: My 1999 Ford Mustang is
Does the car have a check engine light illuminated on the dash? If it does take it to autozone and have them scan the computer for trouble codes they do it for free, then you can go on from there with further diagnosing....
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