O2 sensor help...

[Jeff Chambers]

The O2s should toggle about .42, with greater than .42 being rich, less than .42 lean. What you really need is a break-out box if you can manage to find and borrow one. That'll let you measure the voltage at the PCM harness. At any rate, I'd still have to question what makes you think the problem is in the O2s and not elsewhere. The car may be running rich because of other issues, like the MAF transfer function being off. I'd really recommend seeking a good shop that has the tools to see where the problem is. Ask if they have a datalogger (like SnEEC) for the EEC-IV and a wide band.

BTW: It is possible for an excessively rich condition to register as lean with the O2's and vice versa. Also be wary of exhaust leaks. The smallest of exhaust leaks can wreak havoc with the O2s and have you chasing your tail thinking there's an electrical problem.

[Hozer 88GTConv]

Thanks, Jeff and Joel.
It is running well now, the strut tower connector was a problem and replacing the 02's too seems to have solved the issue.
Unfortunately, I had to crank my regulator up to 49psi at idle (vacuum off) to get the desired readings.
KOER tests show the 02 faults cleared. I did it three times and it drives very well. The Anderson PMS shows the 02 readings flip-flopping back and forth btwn lean and rich. Throttle response is excellent and more importantly, the strong smell of gas at idle is completely gone.
The theory that the car was running lean, so the computer was dumping as much fuel as it could seems correct.
It definitely is running strong, but now I'm wondering if I have another underlying problem in the regulator or injectors.
49psi seems like too much for 24's even with a 76mm MAF/70mm tb, tw heads, etc...
cheers...time for a beer.
I'm taking it the dyno this week for final tuning with a wideband 02.
Might reveal the regulator or injector issue.