I must be doing this wrong or else my TPS is bad. I pulled the TPS connector. Then put the volt meter into terminals B and C (center and bottom terminals). This is the terminals on the carb and not the wire that goes to the ECU right? Then I turn the engine to the ON position (but not running) and the voltage doesn't change. It should read 0.48V right?

Also, where is the TPS adjustment screw? My diagram is way crappy and it isn't obvious...

PS- I replaced the TPS once a few months ago too.

 

If I understand correctly, you need to jumper into the harness while connected to the carb. It's been awhile, but I did this by sticking a couple of my wife's sewing pins through the insulation and into the conductors, and clipping my voltmeter onto the pins.

The adjustment screw is by/under the accelerator pump lever on the driver's side of the carb, I think. If it hasn't been done before, you have to remove a little pressed-in cap to get to the adjustment screw. I'd look at mine, but my wife just took off with the car, and I can't find my q-jet book right now. Funny how those things are in the way when you don't need them, and disappear when you want them.

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82 Berlinetta, orig V-6 car. Rescued w/86 LG4/TH700R with all harnesses, sensors, ECM, etc. 3.08 open, cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, World 305 heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. Currently 396 .030 over, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

Yeah, the voltage will be in the wiring harness, not the TPS sensor itself. I rigged up a set of 3 short jumpers with a little pig-tail on each. That way I can connect the TPS and make it functional (just as if it were plugged in normall) but the little pig-tails allow me to test voltage across whatever wires I want IN A REAL WORLD OPERATING ENVIRONMENT not just a "bench test."


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94 Firebird Formula M6- No options but Z rated tires. No mods over $10. 13.5@105.
79 Malibu "beater" w/junkyard 400 SBC, tweaked QJet 4bbl, finally a decent set of heads, a few other tricks. A maddening 13.000001 @ 108 on the motor with little traction. No nitrous runs with the new heads yet.

"One of the last remaining QJet tuners on Planet Earth!"