ok well i have a 2000 gs 400. here's the story:
i had just punched it twice to show a friend the power. now i punch it a third time (until it shifts to second) and then i have to slow down at the red light. i come to a complete stop at the light and notice the rpm is at about 500 rpm. I thought it was normal, but after 10 seconds, i press the gas lightly to start moving again, and the car just turns off!!!!
Of course i put in park and turned the car on again. Everything was fine from then on. I plan on taking it to the dealer, any ideas what the problem is????
Could it be the throttle position sensor???
Also , i noticed that the idle is low only in D. Reverse,N, it idles normally.
ANY opinion is appreciated.

 

this happened to me once, i pushed my GS3 really hard for a quick little time then stopped and the idle dropped really low. I think its something to do with one of the sensor, maybe O2 sensor, maybe throttle, i think it also might be something about the ECU so just unplug the negative from the battery for 15 minutes then that will reset your ECU which will mean if you drive hard the first little bit it will adapt to fast driving, so you'll have good responses all the time (hopefully higher idles which wont cause your car to die). Good luck.

p.s. i'm pretty sure the reason your car died when you pushed the gas was because you were asking for something it didn't have and the car died, this means most likely a sensor was reading the wrong data, for example it might not have noticed enough air

 

LexusRules:
you said that after disconnecting the battery for 15 minutes that you should drive hard for the first little bit. I want to do this. My question is this ..... how do you define "the first little bit?"

Does that mean that you should try to floor it immediately after re-connecting the battery terminal? I live in a neighborhood and it takes me about a mile of driving before I can get to a road that I can speed on. Will that work? How long do you have to drive agressively ... 5 minutes, 20 minutes?

THanks,
Bobcat

 

just like use e-shift, leave it at a high rpm, try to just maybe blip the gas now and then until you can put some power into it, like at stop sights/lights accelerate hard to the speed limit... nothign to dangerous of course

 

I am not sure what is the proper step to reset the ECU,
but on my other car, honda
the proper step to reset the ECU is:
- take out the negative battery cabble for about 1hrs or so
- attach it back to the battery
- start the car, don't step the the gas or anything for about a min or so
- then just turn the car off, then you are ready, ecu is reset.

(when you first start the car, the ECU is relearning the air mixture/flow rate, so you don't want to confuse it with rev the engine)
this make sense to me


don't know if this is the same for GS

Anh

 

yes this is very true, when i just installed my intake i left the neg. on the battery off for about 45 min and then i put it back and turned on the car i noticed and heard the RPM / engine doing funny stuff, i was worried the intake was screwing up, but really it was learning about the car, pretty neat huh? i bet your GS400 just needs some re-setting.

 

If I take out the battery, what else would it reset besides the learning ecu (and besides memory seats) so that I know what all I need to set back up?

 

Radio presets and clock

 

Ok cool, so radio presets, clock, memory seats, and best of all....the ECU!

Thanks!