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Thanks, Multimeter malfunctioning so ordered another. Hope to have the OBDII and multi today. Upon arrival, will go after the upstream first. Meantime decided to run BG 44K through the fuel system -- never been cleaned @ 175k miles. Also, checking local JYs for Neon injectors... (upgrade...

Thanks Tim, WooHoo...that's a lesson in electrical engineering! I have both digital and analog meters so time to crunch a few numbers. And I thought debugging code was tough... :^)

Hey Tim, Ordered an OBDII to be delivered next week so went back to O'R and read, again: O2. Pursuing the circuits after lunch.. Spoke with lokes who said it may be injectors, partially clogged, and when warm, open up. They also said O2 errors may not be indicative of the underlying problem...

Thanks All, Good call -- time to get an OBD-II. How can I consider myself a consummate DIY mechanic without one? :^) Going after it today -- xj day -- along with window washer pumps and vacuum trace (?) for intermittent AC/Heater air flow. Will post any progress... Jim Happiest Mod? Explorer...

Hi, Thanks for the reply. I think the upstream was NGK and the downstream was a knockoff. Not certain of the codes as they were checked by an O'reilly employee who told me they were o2. Connections look fine... Will try the ignition/odometer flash procedure tonight to make certain they are in...

Hi All, Been following NAXJA for years gleaning a wealth of knowledge --many thanks to all who post. Problem: 1997 4.0 standard starts fine then about 400 yards down the road it hesitates/stutters for about 15 seconds then runs fine thereafter. Checked codes and received O2 sensor failure (up...