HELPPPP! 93 miata, mspnp v1, reading 125 for tps when open and closed - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-05-2014, 07:28 PM   #1
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Default HELPPPP! 93 miata, mspnp v1, reading 125 for tps when open and closed

alright, got it running, but my tps is still only reading 125, no matter where it really is.
I am also having to jump my fuel pump in the diagnostic box to get it to turn on.
Thank You!
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Old 04-05-2014, 08:56 PM   #2
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You have two common problems, both from not reading the directions or searching on this forum.

1. You do not have a variable TPS on your '93. Until you upgrade to an automatic, BMW, etc. unit, you have to keep it unplugged and use MAP based tuning, which really does work great.

2. You did not unplug the ST fuse like the directions clearly state, and you blew the circuit for the fuel pump. You'll need to buy and solder in a replacement resistor to fix it, or keep it jumpered, which is super annoying.
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Old 04-05-2014, 10:22 PM   #3
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Never ran with st sig
If previous owner of ms ran it with the fuse in, would that still screw me up?
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Old 04-06-2014, 04:22 AM   #4
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Yes, the circuit is all in the MS, if he blew it, it's still blown on your car.
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Old 04-14-2014, 07:11 PM   #5
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Also your flood clear TPS value is likely lower than what you have your TPS "Calibrated" to on your MS.
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Old 04-30-2014, 12:08 PM   #6
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Bump.

Car is a 90 with MSPNP9093 (I'm the second owner of MS)- ST Fuse is disconnected and was before install.

I'm having similar issues. I have the Wells TPS201. It reads like 128 no matter what it was at. If the two grounds on the head are on, the fuel pump will not go on, if they are disconnected it stays on. Also, if the grounds are off the MS turns on with ignition off, it you turn the ignition on the MS turns off- opposite when grounds are on. To add to it, the MS will not read my GM IAT, coolant temp (even though its on my cluster) and TPS. On top of that, with my ignition on my oil gauge reads pressure, turn the car on and it reads zero when it actually does have oil pressure. I cleaned the main ground strap on the back of the head and even added another ground to the block, still the same outcome. Any input would be great as I'm scratching my head here. Thanks!

Sorry for thread jacking! lol

-Gennaro
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Old 04-30-2014, 12:38 PM   #7
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how many god damn "I have no idea how to wire three simple ******* wires" threads are we going to have in one month?
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Old 04-30-2014, 12:41 PM   #8
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The three TPS wires are wired correctly.
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Old 04-30-2014, 12:43 PM   #9
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Quote:
Originally Posted by GV1390 View Post
The three TPS wires are wired correctly.
your whole car sounds like it's wired like dick and you're wondering about just your TPS issue?
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Old 04-30-2014, 12:46 PM   #10
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Quote:
Originally Posted by Braineack View Post
your whole car sounds like it's wired like dick and you're wondering about just your TPS issue?
No, was referring to your three simple wire comment.

The only things I wired in from when I last drove it with the old motor/stock ecu are: TPS and IAT. Other than that, I extended the wires for the coolant re-route, thats it.
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