Egr, Maf Sensor
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Junior Member
Joined: Jul 2002
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Egr, Maf Sensor
Hello, I used an OBD2 scanner and obtained a bad EGR valve code. I replaced the EGR and cleared the check engine light. This did not correct the problem. So I referred to the Hayes auto manual and used an oms meter to check the DPFE and the Vacuum regulator as well. Now they both check out ok. So this leads me to believe that this may be a MAF sensor problem. This winter when it was below freezing the check engine light would go out. Since the air is denser when it is cold, and that is what a Mass Air Flow sensor measures, Should I just go ahead and replace the MAF sensor?
Now I know I could take it to the Ford dealer and they could repair it for me, but I’m cheap and want to do it myself. Has anyone else had this problem?
Now I know I could take it to the Ford dealer and they could repair it for me, but I’m cheap and want to do it myself. Has anyone else had this problem?
Senior Member
Joined: Nov 2001
Posts: 767
Likes: 0
From: Central AZ
Things to check:
You got a new EGR Valve, but the solinoid that attaches to it should still be your old one. You must clear the computer whenever you replace a component like this. It re-learns what 'new' is. If you don't, it tries to apply the adaptive correction factors to your new valve's output values and reads an error. Try re-setting your computer. Unplug the negative terminal for about 10 minutes, then go for a drive (10 miles minimum, vary your driving style).
Check the vacuum lines under your hood (especially the ones to the EGR components. . .and the one-way vacuum check valves) Your engine should be able to pull over 18 in/Hg easily.
99% of the time, you will find your problem checking these items. If not, let me know. There are other things you can check, but they aren't as easy to fix.
Good Luck!!
You got a new EGR Valve, but the solinoid that attaches to it should still be your old one. You must clear the computer whenever you replace a component like this. It re-learns what 'new' is. If you don't, it tries to apply the adaptive correction factors to your new valve's output values and reads an error. Try re-setting your computer. Unplug the negative terminal for about 10 minutes, then go for a drive (10 miles minimum, vary your driving style).
Check the vacuum lines under your hood (especially the ones to the EGR components. . .and the one-way vacuum check valves) Your engine should be able to pull over 18 in/Hg easily.
99% of the time, you will find your problem checking these items. If not, let me know. There are other things you can check, but they aren't as easy to fix.
Good Luck!!