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93 f150 egr system problem
Hi everyone I have a 93 f150 with a 4.9, it failed an emmisions test, so I checked my vacume hoses and did some testing...found the egr was not opening, checked the egr valve diapham(ok), it wasn't getting vaume so I went to the egr solinod it was getting vacume but was not opening, sanner says egr solinod circit fault, I've tryed 6 used solinoids, no luck! checked the voltage across the plug teminals I have 12v...I'm told this is bad!checked the the wiring harness, it seems to be ok...so...the solinoid is is controled by thr pcm, could this be the problem?, can you test the pcm?...any other suggestions?....HELP plz
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