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Nate, FYI: As you are contemplating oxygen sensor issues, I sensed you may be interested in the following: The V6 control system has three (3) particularly poor items contained within the design, that are equally capable of producing all manner of driveability issues without so much as a...

Dear nweibley, Apologies for the lackadaisical approach to my reply. My troubleshooting found a few faults, which when cured in total cured the issues. The norminal fuel pressure is spec'd at 65 psi +/- 8 psi and it should not leakdown quickly when the engine turned-off. Once tracking...

Jeremy, "am i correct in assuming that since i hear the fuel pump come on, that there isn't a problem with the power to the fuel system? (i.e fuel pump relay, eec relay, ect??)" - A fair but not guaranteed assumption. "..wouldn't that mean it's a spark problem" - Not definately, no...

Hello everyone, I have a 1999 XLT with a V6, SOHC, which has all original factory equipment including a Returnless Fuel System (!!). It appears to be a Mechanical Returnless Fuel System as there is not an electrical pressure tranducer apparent at the rails and there is a mechanical damper on...

Ron, As you open the hood and are faced with a rather large black plastic cover (with SOHC 4.0L written even larger on top) you will notice same cover is affixed to the intake manifold with four (4) screws. Remove the screws (and notice the cruise control cable towards the rear of the cover...

You are welcome ronev. Certainly worth replacing your o-rings. Your fault condition does not appear to be releated to them, but free is free; rather, I suspect your fault condition (given the AIR politely supplied by the 5% throttle actuation cures idling issues) is related to a...

Dear Ronev, See if the following synopsis of temperature dependent engine conditions pertain to your vehicle: COLD START – ENGINE NOT OPERATED OVERNIGHT – 40 DEGREE AMBIENT: Upon cranking engine starts right up and the idle jumps to about 2K. Then it starts idling back to about 500 rpm...