above 1/3rd throttle = CEI?
 

The heck? I don't know if it's because of the colder weather or something, but using more than 1/3rd throttle causes my check engine light to blink on and off.

I'm pretty sure it's the TPS but I think the pressure sensor might be part of it, since it threw codes for all three of them.

What would cause this and how can I fix it?

It doesn't seem to effect how the car runs much, although my idle is strangely week again, even after fixing several vacuum leaks last night.

ummm check the codes

I already did. At the time it was throwing the two TPS codes, and the pressure sensor codes.

Now it's just the pressure sensor code, last I checked.

Now the pressure sensor isn't working since it doesn't change the idle when I pinch its hose... doesn't look like the connector is loose so I'm gonna have to check the harness's continuity.

1/3 throttle according to TPS or according to your foot?

It's just an estimation.

my tps would always read 100% at 1/3 of the actual pedal throw. you can actually feel that point too. it's when the secondary butterflies start opening so there's more resistance on the throttle cable i guess. maybe your problem is related to that functionality somehow

S4? If so, that's normal.

yeah i figured it was normal. seemed like it made sense anyway.

It turns out that the light goes out once the engine is warmed up...

So I would suspect that the TPS is simply out of adjustment when it's cold (due to the thermowax) but when it's warm it goes back into spec.

This is the first time for me driving in the winter... it takes longer for the car to warm up.

The pressure sensor is still a problem though... I would expect it's why I'm not getting quite as much power nor as stable an idle as usual.