problem starting my car

[Airjer_]

I would think that what is happening is the vehicle goes into open loop when it sees an input failure. You unplug the TPS and the computer goes into open loop. Essential running on preprogrammed strategies and not using any sensor input (exept those absolutely vital to keeping the engine running). Once you plug in the TPS the computer sees the input and goes back into closed loop. Closed loop strategy uses inputs from various sensors to determine fuel and spark.

Does that sound right to anybody else?

I'm still thinking along the lines of a vacuum leak (leaking intakes are pretty common on these) but Somthing else occured to me. Wouldn't a bad MAP sensor cause a start and stall also? If you unplug the MAP what happens? The same thing as unplugging the TPS?

[saturntech]

Originally Posted by Airjer_

I would think that what is happening is the vehicle goes into open loop when it sees an input failure. You unplug the TPS and the computer goes into open loop. Essential running on preprogrammed strategies and not using any sensor input (exept those absolutely vital to keeping the engine running). Once you plug in the TPS the computer sees the input and goes back into closed loop. Closed loop strategy uses inputs from various sensors to determine fuel and spark.

Does that sound right to anybody else?

I'm still thinking along the lines of a vacuum leak (leaking intakes are pretty common on these) but Somthing else occured to me. Wouldn't a bad MAP sensor cause a start and stall also? If you unplug the MAP what happens? The same thing as unplugging the TPS?

I agree with you, if you unplug it how is the comp supposed to know driver input. I would also being looking for vacuum leak, or intake. Could also be a skewed iac motor.

[Airjer_]

I thought about the iac as well but it doesn't make sense that it idles high intially and then stalls. I suppose its not impossible!

[saturntech]

Originally Posted by Airjer_

I thought about the iac as well but it doesn't make sense that it idles high intially and then stalls. I suppose its not impossible!

If the intake is leaking, it would have to be a pretty big leak for it totally stall out.

[Airjer_]

Good Point!

[RC1488]

Have you cleaned your throttle body including the IAC?

[Hybrix]

i got my car fixed.
there was fuel in the vacuum lines.

[Airjer_]

Why was there fuel in the vacuum lines? What vacuum lines where there fuel in? What was fixed in order to stop getting fuel in the vacuum lines?

[saturntech]

Never heard of that before, if there was liquid in the vacuum lines you think that it would just get sucked into the intake ???