NoPistons -Mazda Rx7 & Rx8 Rotary Forum - Replaced Tb= Ran Good Then Bad

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- - Replaced Tb= Ran Good Then Bad (https://www.nopistons.com/2nd-generation-specific-17/replaced-tb%3D-ran-good-then-bad-39385/)

Ive got a really wierd setup guys.. Im running a TII block with the TII intake manifolds and NA exhaust. So obviously I do not have a turbo. I am using teh s4 NA harness and ECU. Now that you know my setup read about my problem please.

I had the NA TB on there at first, then I found out I can just use teh TII TB and have everything more accesable. I put that on today, but since the TPS on there is s5 and the s4 TPS will not bolt up on this TB I had to do a little splicing. I left the s5 TPS on the TB, but spliced in the s4 connector to the same color wires. I started up the car and wow it started up so fast, better than ever before. I fine tuned it a little and it ran so good, idle was very smoooth and revved up very fast. I took it for a drive and wow it felt like it had way more power. The car just took off. I got to the end of my street and this happend:

I let go of the throttle and the idle starts bouncing up and down from 1.5k to 2k. So I jump up pop the hood and disconnect the TPS thinking its the problem. With the TPS disconnected the idle just shot up to 4k and stayed there.

If you have any idea of what the problme is PLEASE tell me. I really need to get her running good so I can commute.

First off i have no idea which of the two connectors you hooked the TPS up to, but you need to use the narrow range one. I don't know if they are calibrated the same (narrow range S5 to standard s4) but it should be close. You need to check and set the TPS resistance according to the FSM (copies are available at iluvmyrx7.com if you need them) and make sure that the tps is in spec throughout its range (resistance-wise).

The other possible problem is that you have a misadjusted idle speed setting so grossly misadjusted that the ECU is completely confused about whether its at idle or you've got your foot on the gas. Again, calibrating the TPS and ensuring you are NOT using the full range TPS sensor for your S4 ECU is the ticket.

I don't necessarily believe the same color wires carry the same signals S5 to S4 but its possible.