USA Made Quality Control:

Robert Herndon said:
Ok,

So on a Ford of this vintage. the rear oxygen sensors serve only one purpose - to tell the PCM that the catalysts are operating within an specified efficiency parameter. They are part of the catalyst monitor circuit. Knowing the Ford PCM sends an approximate 5VDC reference signal to the oxygen sensor, its signal voltage jumps up to 0.8 to 0.9VDC when the air/fuel mixture is rich, and drops to around 0.3 volts or less when the air/fuel mixture is lean.

By incorporating a 1 MegΩ resistor and a 1.0uF capacitor, I can send a constant 0.5 to 0.6VDC signal to the PCM. which would staisfy the catalyst monitors and prevent a CEL even if the car had no catalysts at all.... :)
Click to expand...
Are you positive the PCM doesn't need to see the voltage oscillate? The GM's did back in the late nineties to mid 2000's.
 
mini ram.jpg

These things used to give me friggin' nightmares. The throttle body cables don't line up. The water neck is too close to the intake boot. There isn't enough sealing surface at the bottom of the intake port. Etc. I do not miss it at all.
 
That is the Tuned Port Induction Specialties Mini-Ram. It was designed to replace the tuned port intake system on 85-92 Corvettes, Camaros and Firebirds. It worked great, but was definitely not a simple bolt on for the home mechanic.
 
Basically, back in the day a GM engineer snuck a pre-production LT-1 intake manifold out of the factory and we magically got our hands on it and designed a version for the standard small block chev. Of course he got fired.
 
Poor quality control is an international epidemic. "Made in America" used to be a guarantee of quality. It no longer is.

When I was growing up, "Made in Japan" was a bad thing. Now it costs more for Boss pedals made in Japan (Waza, I think). Who knows, made in China may be next. I'm holding on to my Harley Benton. Anyone wanna buy it now for 10K?
 
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