87 505Turbo TPS adjustment
From: august macbeth (august_macbeth@hotmail.com)
Date: Sun 31 Mar 2002 - 15:02:37 EST
adjusted the TPS last night using the grubbs method (nicely done might i
add). (X=2.10) when the throttle is closed, i adjusted it to 2.10, but when
wide open, it was 11.60v and it should be battery voltage (12.68 at the
time) correct? what am i doing wrong here?
august
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TPS adjustment is a long and annoying process. You need to obtain
some alligator test leads from RadioShack. The adjustment is
performed with the engine off and the TPS disconnected. BTW unless
the TPS is *grossly* out of adjustment, the engine will likely idle
and handle light-part load just fine. It is unlikely that your
problem can be fixed by just adjusting the TPS.
- First measure the battery voltage
- Multiply this number by 0.166
- Remember this number--this is going to be the TPS adjustment
voltage, we'll call it "X"
- Using the test leads, connect the battery across the resistor
portion of TPS. The orange wire goes to (+) and the black wire goes
to (-). Use an inline circuit breaker or fuse
- Connect the (+) probe of the DVOM to the green wire (wiper)
- Connect the (-) probe to the negative battery terminal
- Test this setup by watching the meter. With a closed throttle it
should be around 2 volts. Open the throttle all the way and it should
read almost battery voltage
- Loosen the two 3mm screws on the TPS a little and adjust until the
reading on the meter is "X"
- Carefully and equally tighten the screws--keep an eye on the meter
because the adjustment will likely drift as you torque the TPS down.
This is annoying part of the procedure
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