Engine Performance problem
1999 Ford Explorer 6 cyl Four Wheel Drive Automatic 89,000 miles
I have run out of deductive reasoning on my 99 ford explorer with the 4.0 sohc engine. Based on extensive research, I have replaced the plugs, wires and coil. I have tested and cleaned the MAF sensor. Disconnecting did nothing but make it run worse. I have checked the EGR, and it seems to be functioing fine. I had the codes run today, but there is no decifering the combination and what they collectively mean together. I am certain that some appear due to other sensors reacting to the root cause. I am out of ideas. Help! The codes are, P0102, P0113, P0171, and P0302. I was going to replace fuel filter for grins, but the stupid tool doesnt work. Any ideas? Anyone?
What is stranger yet, is that sometimes whether hot or cold, when it has sat a little while, I go to start it and it runs great again for a short while, but then again it becomes rough. It seems fairly smooth running at above 55mph.
Thursday, July 15th, 2010 AT 3:25 PM