Hi All,
Cliff asked me to elaborate on my calibration of the TPS sensor on my wife's 90 ZR1. I have a lot of experience adjusting the TPS on my 87 L98 and I was happy to see that the voltage setting and procedure is the same.
First, I use a plug in interface harness that I purchased from Mid America Motorworks that make setting the TPS voltage a snap.
Procedure.
Install the MA interface. It will only install one way so it is mistake proof.
You should have a DVM to set the voltage correctly. Any good DVM is OK. I use a Radio Shack Auto ranging Digital Multimeter.
1. With ignition "OFF" disconnect the connector from the TPS.
2. Plug in the TPS jumper tool. Use caution as not to bend the connector pins.
3 Turn ignition "ON" engine stopped, use the DVM to measure voltage between terminal "A"(black wire) and "B"(red wire).
4. The voltage reading should be between 0.465 and 0.615 at closed throttle. Note: Your specific voltage may vary but I use 0.54v as my set point on our 90 ZR.
5. If reading outside of spec, loosen the TPS mounting screws (should be Torx #25) and rotate the sensor to achieve your particular specifications.
6. Tighten screws and re-check voltage setting.
7. Turn off engine and remove the jumper tool. Reconnect the TPS connector.
It is certainly possible to just pin probe the Red and Black wires with the DVM and it should work just as well. The jumper tool just seems easier.
I also have a poor mans field test for the TPS that I will pass on as a FWIW procedure if you are stuck somewhere and you suspect the TPS as being the culprit you can try the following.
If the engine will start and somewhat run (even with rough idle) Locate the TPS actuating lever and manually move it to a position about 25% open. If the engine speed increases with no dead spots (even though the throttle plates are closed) then the TPS is "probably" OK. If you hit dead spots or the engine does not increase in speed, then you need to consider replacing the TPS.
This procedure has worked for me 100% of the time on my L98 and it should be worth a try on the LT5 as well. I realize that the LT5 and the L98 intake systems are very different it should give an indication of the health of the TPS. Again, this is a FWIW procedure.
Regards,
Don in VT
Quote:
Originally Posted by todesengel
Tom, thanks for the reply. Yes, it just did not reappear inthe next starting sequence. I am not sure if these things are prone to phantom codes, but it was certainly stored in memory for me to extract.
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