why does my celica run better with tps unplugged???? Options

[replica250]

hi every one, i got a question
why does my car run better with my tps unplugged?
my 3sge has a wimpy cold start and suffers from an iratic idle, fine until it comes off cold start at the point my temp needle reches just under half way.
on cold start it will start first time but just sit at idle then if left for around 20 30 seconds it jump up to 1500rpm and happly sit there untill its warm then the idle when warm will dive to just above 600 rpm and car will shake but after 10minutes worth or driving itll settle.
anyway i forgot to plug my tps back in after working on car saturday and i fired up the car and it started perfectly and drove fantastic and had super throttle respone, only down side was it hunted on idle
only about 300 to 400 rpm once warm
so whats the deal? why does car run better once tps unpluged????

[richee3]

Excellent here's a very useful how-to for adjusting your TPS. There are huge differences between our cars and the IROC's that this how-to is for. For starters, out TPS's are pretty much set and not adjustable. They can be moved slightly, but not enough to make a huge difference. This how-to tells the voltages that you should see when you test your TPS though, and when I tested mine, my voltage was spot on with this how-to.

http://www.iroczone.com/2009/10/adjusting-...ion-sensor-tps/

As for wires, we have 3 on our TPS. One is power, one ground, and one variable voltage wire. That's the one you want to test. Ground should be brown, power is black with red if I remember correctly. I'm curious to know what voltage your TPS is putting out.

When you unplug your TPS, your ECU reverts to a "safe" map that should theoretically be worse than of your TPS is plugged in and working properly. When the ECU is using the safe map, it runs rich and cuts down on power. I recently had a similar problem to yours. My car was going lean at 3,000 rpm and bogging. When I unplugged my TPS, it added fuel to run rich and in doing so, kept my air fuel ratio from going too lean and bogging. If I had to guess based on my experience, your car is running lean for some reason and the enrichment is helping smooth things out.