I have an 2001 Ford Explorer 4.0L SOHC.
My problem began several months before this actual problem, I had a CEL. After having the code read, it turned out that it was the IAT sensor. Since I believe the IAT and Maf are together on this model, I replaced the Maf, the code went away.
During this time, the Exploder was hesitating very badly, I instantly thought of the spark plugs even though I had replaced them last year. The problem wasn't with the plugs, but with the plug wire off cylinder #5, which when I popped the hood and let the vehicle idle, you could see the plug wire shaking violently. I replaced the plugs anyway with Motorcraft Double Platinum, and the wires as well.
This took care of the hesitation.
This newest problem came when I tried to start the vehicle one day. It would not start, so I instantly thought that my battery may be getting ready to die. I had a friend jump me off, and the vehicle ran fine for a couple days. Then it got to where it would stall out on me. It died on me a couple times at idle. I was driving down the road, and it turned off on me at 65mph, but instantly turned itself back on. Then it turned off on me when I was coming to a stop, and would not start for about 20 minutes.
I was doing some testing, because my ignition switch was nearly yanked out a couple years ago. I thought that the switch may have been backing itself off, and was able to confirm this 2 times. You could turn the vehicle over and eventually start it, but if you pulled toward the passenger side, or turned the switch back just a hair (not really using any pressure), the vehicle would stall. I decided I'd attempt to install another cylinder lock (This is the part I thought was damaged) and just get a locksmith to re-key it.
This got me into the PATS system. Lol I destroyed the black ring with antenna that reads the chip in your key, so I ordered a new one from Ford, and installed it. The vehicle started instantly, and ran for 2 weeks with no problem. Well, it's back to it again, this time I'm not even able to get the vehicle to start.
These are some of the things I've done.
With key in the ignition, the PATS system checks out. (Does not blink rapidly)
The CEL and other lights come on before cranking, while cranking the CEL light does go off. The starter motor engages, and cranks the vehicle. (Just to be certain, I replaced the CKP sensor.)
The Fuel Pump is running, I checked the fuel pressure when this began again. I am getting 60 PSI KOEO. KOER I am getting 62 psi, and when I shut the vehicle off, after about 6 minutes I still had 60 psi. I've also pulled spark plugs #5 and #6, and both plugs are wet. They still look good besides having gas on them, and you could tell the vehicle had been running a little rich. Probably due to the bad IAT sensor.
The vehicle has a new battery, and battery voltage is good. 12.4v I also replaced the TPS when I replaced the CKP.
I replaced the Ignition coil with a new one, and this did not help either.
I am at a loss, are there any other things I should check?
Thank you guys for reading, and any help is greatly appreciated.
I forgot to add that I changed the fuel filter about 5 months ago. The fuel that came out was a little dirty, but did not look rusty.
have the same problem?
Monday, July 19th, 2010 AT 2:03 PM