OK I will try and clear this up a little more lol.

This problem of mine started not too long ago. I checked the diagnostics myself, and I thought I came up with TPS and knock sensor error codes. But then I took it to my mechanic, and they came up with only the knock sensor. So I misread the codes when I diagnosed it myself. And they replaced the sensor for me. Now my engine light is off. So it wasnt the TPS at all.

But I still have the same problem. The throttle body was cleaned out. I have checked for leaks in the intake manifold and vaccuum lines, but I cant seem to find anything that would cause it to act like this.

does anyone have a clue to what might my problem be?? because I hate driving the car for like 20 mins. then turning it off, and starting it 15mins later and have it act all retarded and just die like it does.

have you tried the idle speed control valve?

http://www.cygnusx1.net/supra/librar...fi/FI_106.html

Mine had done that some, but not as bad as yours it sounds like. I made sure that the butterfly was closed all the way. It needs a small, small gap to keep it from sticking and then screw the idle adjuster all the way in then back out about 2 turns or so. I know the engine is hunting and it is very annoying. Make sure your timing is set to at least 10 degrees btdc. Try pinching off the vacuum retard on the distributor when it is running and see if that does anything.


The ISC can be the culprit too, so make sure the electrical plug is all the way in along with the plug in for the throttle position sensor. Try pinching off vacuum lines too. Make sure your bellows is tight and has no cracks.

I am just throwing out a lot of things but I got mine to start up and run smooth eventually by checking all those things.

Keep us informed.

Russ

alright, i will check all of those things in the next few days when i have time. and i will keep you posted on whats going on. i appreciate the help on this problem.

Sorry to bring up an old post but I have the exact same problem and I have checked all that stuff. Please help!

Does anyone have a diagram on how to check the TPS ??????

Okay first and formost this problem is somethin I had as well. I know his might seem stupid, but check the preheater hose (this is the piece between the AFM and the throttle body, the part with the big round thing on it, the silencer) and check for leaks in the house. If there is is can cuase this big time. It is exactly what happnened to me. It also could be a problem with your AFM itself.

I am going to redirect this to my other post....

http://www.toyota-supra.info/forums/...9547#post29547