At wits end with a problem RE rich running and failure to go into 'closed loop' mode. Have eliminated about everything else. Not temp II, O2 sensor. MAF tests OK and has been refurbed by John Speake recently. I can't get car to run stoichiometrically even with fuel pressure turned WAAAY down. TPS is not good, but if anything, it should not be prompting brain to enter idle map (closed throttle should be 0 ohms, and tested anywhere between 34 and 55 ohms, but is infinite when throttle open at all, as should be). (Just never entering the idle map couldn't cause this problem, right?) WOT is OK I think - with throttle closed, the circuit isn't completely open per se, but R=14.5 mil ohms - pretty close - and with throttle firewalled, WOT = 0.37 ohms.

Should I be looking for a computer to swap as the next diagnostic, or replace the TPS? Any other ideas? I haven't checked the continuity of some of this stuff at the LH plug - I just got a copy of the correct pin diagram.

 

Disconnect the vacuum lines from the FPRs and damper, then plug the lines. Make sure the diaphragms aren't leaking.

Edited to add: Don't go on boost because you will not get the fuel increase without the vacuum/boost reference.