philyII

91 JDM TURBO II i swapped into my 90 gxl. idle is eratic, 1000 threw 3000 it stumbles, sounds like the plug wires are wrong bababababa, thats what it sounds like. then when the turbo kicks in at three grand it kicks. but then sometimes the turbo wont hit till sixgrand. I have the fuel cut defense chip with a racing beat three in down pipe, no exhaust. it ran ok at first but would over heat. i took it for a twenty min drive then i started to have all these problems. i was thinking maybe it could be a tps issue? i need help bad. i have sunk over three grand in the car and i cant drive it. makes me real sad cuz i love this car . i have had it for 5 years and finaly got hte motor and everything in it.


also if anyone knows a good mechanic near cincinnati ill tow it there. HELP GET THE 7 RUNNING

RotaryRocket88

iTrader: (7)

The TPS can mess with your idle and low throttle situations, but at WOT the ecu will ignore it. If you floor it and it only weakly pulls until 6k, it's not going to be the TPS at fault. Common electronic failures can be with the AFM, boost sensor, or ecu itself. I'd check the AFM and boost sensor resistance values with those listed in the FSM. As for the ecu, what model are you using N370? N374? I know a lot of people have trouble with the jspec N374 when swapping S5s. Specifically problems with it not wanting to fire the rear injectors, but others claim to have made it work just fine.

SpeedOfLife

iTrader: (16)

Are you sure? I though the S5 TPS has even a larger range than the S4 one (I guess one of the reasons there are two parts to the S5 TPS to the one for the S4). I'm not saying I know how the S5 TPS can act up, but I would think it could be similar to the S4. I've had serious throttle issues before due to a TPS that had its top end missing, so I could get to 6500RPM and then it'd feel like fuel cut. Replaced my TPS and I can redline all day now. I think at the very least it would be wise to test his TPS.

philyII

i got the motor ecu harness and tranny from osaka jdm motors. im not a mechanic but im not stupid. i had a local shop install it but they mean well but really have no idea about a rotary. so what should i do ? check the tps, and if so how do i check it. i no a new one is reall expensive. oh and the car gradually got this way. it would only act like it is now once it got hot . then i would shut it down then it would be ok. now its just crap

RotaryRocket88

iTrader: (7)

As far as I know, at WOT the ecu should be running the injectors according to the fuel map & not metering at all. I guess if you had a big dead spot in the TPS, the ecu wouldn't get the signal that the throttle is open, and therefore try to meter fuel. People usually have problems with idle and other metering situations, though now that you mention it, under those circumstances it could keep the car from fueling correctly at WOT.

The S5 TPS has both narrow and full range plungers, which means it just has a specialized plunger for idle and low throttle operation. To get a problem like the one you had with your S4 TPS, it would have to be the full range with a dead spot. It's basically the S4 equivalent, so the effect should be the same.

PhillyII, here's a link to TPS testing info:
http://howto.globalvicinity.com/gv_w...i=58&co=1&vi=1

And again, what ecu are you using? And what EM harness did you use? List out what modifications you made to the electrical system, and what components you swapped out.

RotaryRocket88

iTrader: (7)

Correction to my last post: The S5 TPS narrow range plunger is the equivalent to the S4 TPS, so test both to be sure.

AUGieDogie

iTrader: (4)

Did you swap any wires on the harness? The N/A and the T2 are the same on an s5, except for 3 wires. Can remember which three right now. But it might be important.

philyII

guys i really dont no, i had a shop do it. my grounds look poor though. and im using the ecu i got from osaka, i dont no wich one it is or anyhting. im really learning about my car as i go. tell me were to look and ill tell ya. thanks for ther help guys . sorry im ignorant. im not stupid though and ill pick up this fast if ya help me.

philyII

ok so i adjusted the tps. it worked. but i took it for a test run and my radiator that already had a leak in it blew so i could only take it for one run. the turbo wasnt kicking it at the right rpm but atleast the hesitation between 100 and 3000 has gone away. i will get a new radiator hopefully in a couple weekes then ill tune the tps to were its suppose to be, then hopefully everyhing will be ok. over all i feel good though. i got the stumbling to go away between 1000 to 3000 , now all i have to do is get a radiator and tune that tps just right!!