1990 Throttle hesistation

[Schrade]

Originally Posted by Franke

Wow, never seen that on my car. Voltage is ok then but why the single momentary open loop at initial 1.6-2.4 % tps? It seems as if there is a flat spot on the tps but I think you said you changed it. Correct? Also, have you ever replaced the O2 sensors? One side seems to be lean at idle.

https://www.youtube.com/watch?v=Vl4INfOBUiY @ :36

I just noticed that Franke - that the momentary Open Loop, while it's been in CL for several minutes, DOES CO-incide with the excession of 1.6 % TO.

I'll see if I can replicate that, and get exact data for it...

[XfireZ51]

Why is the TPS% 1.6 at idle? .61v is high for idle.

[Schrade]

Originally Posted by XfireZ51

Why is the TPS% 1.6 at idle? .61v is high for idle.

It's not idling Dom.

Idle Voltage motor off, Ig ON, TPS is TUNED to 0.54V. Ig ON, motor on, it stays @ .54V.

I'm using a box wrench to bump throttle stop screw, 1/6th turn of the Hex bolt at a time.

And I was doing it SLOWLY, to allow parameters to '0' for that TO %.

TPS voltage, and TO %, in DM, are in pretty tight sync, and are posted in this thread a few pages back.