ka-t TPS issues

[unreal-]

Hi everyone,

First off the specs:

96 240sx
- Running obd1 ecu from 95 s14 (NISTUNE)
- Gt2860rs turbo @7psi
- new TPS/o2/CTS/IAT sensors
- removed evap and egr
- fresh ngk vpower gapped to 0.030
- quest alternator
- fresh battery
- TPS set to 0.48V closed


Been having a random issue with my car that has me stumped. Occasionally the ECU will refuse to see the tps as closed, and the tps idle light does not activate, which causes my injectors not to turn off on decel, richer idle, and noticeable power loss. Also the car stalls easily. To remedy this, I have to shut the car off, wait a few seconds, and turn it back on and it will read the tps properly for up to 3 weeks (with multiple drives and various temps). Ive proprlerly set the tps voltage several times, checked all my grounds, and searched the forums with no solution to my problem. It did this with my current nistune ecu and my previous enthalpy ecu.

Any ideas?

[waxball88]

Check your harness. I had odd issues with cutting out, dying, etc. ECU threw TPS code, checked plugs to find broken wires.

[unreal-]

Odd thing is that the ecu does not throw a tps code at all. And for the most part, it sets the tps idle just fine and I can haul ass without a care in the world. It just gets tiring having to shut the car off and wait a few seconds every couple startups...and I have yet to find way to make it repeatable and not random.

[unreal-]

BUMP. Have some more information:

- It occurs immediately after starting


- Under normal circumstances my TPS voltage is 0.48v closed, and ~4.14v WOT (Engine running) When i shut off the car and watch the voltages, my TPS voltage decreases from 0.48v down to 0.44v and WOT voltages start off at 4.14 and drop slowly to around 3.88-3.90v after about a minute.

Is it Possible that the voltage drops are causing the ECU not to read the proper voltages since it falls below the minimum threshold? Then when i cycle the key, it gets a voltage bump, and then the ECU can read it again? Thinking it has something to do with the non-oem TPS.