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In Reply to: TPS posted by Philo on July 02, 2002 at 12:56:10:
AFAIK, the idle position tells the computer to bring the feedback control idle circuit into operation. The WOT position tells the computer to discard O2 sensor readings and go rich for max power rather than lean for economy.
Agree with Geoff on the idle behaviour sans switch. On the earlier E30 cars the idle was unstable and the car would cycle between 500 and 2000 RPM at about 2-3 Hz. Classic on-off control by the ECU in the event of idle control failure. The S38 must have a more stable idle even w/o feedback control.
Not having either position will not affect any midrange hesitation, IMHO. Have you had the car dyno'd. Did you see a blip in the curves?
Neil Deshpande
http://www.neilwerke.com
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I've been chasing a hesitation problem and while testing my TPS to make sure I have continuity at idle and WOT and noticed I do NOT continuity at WOT at all. I've probed all the pins to make sure I didn't miss anything as well. I looked in my Haynes manual (I know, this book sucks)and they talk about testing the TPS for continuity at WOT but then go on to say that the voltage should read 4.5 volts at WOT. So I'm not sure if I should see continuity or not at full throttle. Has anyone done this test.
Also, I forgot to plug the TPS lead back in and started the car the next day to go to work. I did notice the idle rpm stages to be slightly different but thought nothing of it. I drove around the block and the car did run as though nothing was wrong. Interesting, I didn't know the car would run with the TPS disconnected. What is telling the AFM to open ?? O2 Sensor ?
Philo.
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