Ranchero,
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If that doesn't do it check the 12vdc to the heater on the O2's. One smack of wiring on headers wipes out the fusible link hidden in the wiring on the engine side of the firewall where the main puter harness goes through. This will cause the o2's to slowly go out of tolerance and the puter flips out. check this if the car's running really rich a idle too. Ranchero got nailed when first installed and the '93's done it too. I actually ended up soldering on a stereo inline fusible link and installing a 20a fuse to make the repair quicker.
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Can you elaborate on this? I've been fighting a fairly rich/rough idle for a few months now. All sensors are new and less than 30,000 miles old. Even shade tree data logged the ACT and ECT. They looked fine. Engine pulls 19.5 in vac at idle. The problem can be partially solved by resetting the computer. After a few thousand miles of driving, part throttle response and gas milage decrease, and the car once again settles into a rich idle. Where is this fusible link located and how can I fix it?
Thanks