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This is a 98 Expidition 5.4 Auto. The truck misses at low RPM, more when you step on it from a stop.OBD2 said that the #2 plug wire was bad and also the EGR valve.I replaced the plugs and wires,the EGR is in the mail.The wire tested good,and I still have a problem. P.S. I cant believe that a faulty EGR could cause this, maybe a TPS ? Please help.
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Hello and thanks for the question...I'll try to help.
What were the codes that you got from the OBD II system. Just because a fault code was stored, does NOT mean that the part is bad/out of range. There are certain tests that need to be performed before replacement of any part.
Thanks,
Erik Erik, The computer was clear of codes before I ran the test.
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I would check the basics, fuel pressure, ignition timing, air induction function, and also make sure that the spark plugs are good as well. Erik, I have replaced the plugs,coil packs and air filter. I will have to find a pressure tester for the fuel system. Any other faults that you can think of if its not a fuel problem? Thank You-Jed
AnswerHello and thanks for the reply,
I would also check the EGR passage to make sure it's not blocked up with carbon build-up. Also, check the EGV Vac. supply------make sure the hose that goes to it is not kinked, cracked, and make sure it's attatched to the correct Vac. port.
Hope this helps,
Erik
