1990 Chevy Lumina 1990 Lumina Stall ...

Hi
Try this test of TPS on throttle body. Back probe terminals B & C ,Pins help. With key on engine off measure voltage throttle closed. Should be .5V. Then open throttle slowly while observing. Voltage should increase no drop until wide open at 4.5 V.
Let me know
Thanks for donate

I did the 5V reference check at the plug and it was 4.93v.

I did the resistance check on the ohm meter and it was smooth through out no jumps or voids in resistance.

Pretty sure TPS is good.

Any more ideas?

Code 23 dropped out, should I clear the codes and start over with them?
Still have 22,32,34 codes.

Idle is a little iratic.

Thank you Joe!

Yes clear codes drive if light back on recheck codes

I reset codes and came up with 32 again, then I went and installed new EGR valve from (Auto _one) you know the parts place. Car ran terible I could bearly KEEP IT RUNNING. I returned said part to part store.
I cleaned and reinstalled old EGR valve and car ran a lot better but came up withy new code, 34, but that could have been when it was still running rough. What causes code 34 to show up, high vacuum I know, but what generally causes high vacuum too map sensor.

I will clear codes again tomorrow, and let you know what comes up.

Do you think the crankshaft postion sensor could be what is stalling the engine?
Is there another component in the EGR circuit or elsewhere you think I should look at?

Joe

Your EGR is supposed to be a Digital operates with solenoid. Sending some info that may help. Map sensor test voltage on terminal B. at 1000ft altitude or less 3.8 5.5v at 1000-2000 ft 3.6-5.3 each increase of 1000ft voltage drops .2v. EGR flow chart will take you through diagnosis. maybe small print to enlarge.