Hi, I am a new member to the group. My problem is my 96 explorer, the EGR valve cause the check engine light to be on, which cause a failure in New York State inspection. I have changed, valve, selonid and vaccum lines, then cleared the computer. A few hours later the light came back, this time the reading is, low egr vac. Could this be something electrical.
grasshopper
No guarantee, but as far as I know, about 90% of the EGR-related failures around this vintage are due to the DPFE sensor. It's fairly easy to test with a vacuum pump and a scanner. In a pinch a crude DPFE test can even be done with nothing more than a voltmeter and some 'smart' messing with the throttle (engine runnig), forcing the computer to open the EGR valve. Of course, it would have been cheaper (not to mention faster) to pay someone with the proper equipment and knowledge to diagnose, but I do understand the pleasures of throwing parts at at a problem -- have done it myself, more than once. So since you have already replaced just about anything else, you might try the DPFE now. But before you do, make sure that the tubes leading to it are not clogged or reversed. Good luck!
By the way, I vaguely remember an 'extended warranty' or something like that for these failure-prone DPFE's. Won't hurt to check if your '96 is still covered.
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