I posted over on nico and havent really gotten a response. Figured I would give over here a shot..

I have searched around and found some similar stuff, but couldnt find anything exaclty like what I am dealing with.

I bought a 95 S14 off of a co-worker of mine that he attempted to turbo. Two cylinders were low on compression along with some other issues that I sorted out. I am at the point now where I am ready to have it tuned, but am not really sure its running correctly.

The car is a KA-T with a nistune setup in the ecu. Related stuff is SR injectors, stock MAF (switching to z32 before the tune), recently replaced distributor since I broke the one that came with the car, crower cams, 255 fuel pump, and misc other stuff, but that should be the main things related to the concern.

The vehicle idles decently right now, but when you rev the engine with the TPS plugged it in revs like crap. If you slowly increase RPM you can get it to 3500 - 4000, if you stomp the accelerator, it goes to 2000 rpms and stops. If you unplug the TPS, you can rev it to pretty much red line without much drama. I spoke with the guy that loaded the base map on the nistune when the previous owner had it previously to getting to this point. He said it was for NA, stock MAF with SR injectors, and that the car should idle, but told me not to boost it. The TPS was out of adjustment, I was able to get it back into spec per a how-to on here. When setting the timing (at 20btdc), I was having trouble getting a good signal to the timing light from cylinder 1. Cylinders 2 and 4 gave the timing light a good signal and cylinder 3 was decent, but there were some spots that seemed to skip a flash every now and then. I used a different timing light and was able to get a decent signal on cylinder 1, but it wasnt perfect. I got the timing in, but I am curious if I bought a bad distributor? There is a new cap, rotor, and plug wires on there, and I know the plugs arent fouled. When I rev it with the TPS plugged in it just sounds like the ignition is breaking up, but I guess there is a possibility its fuel related. It just doesnt explain why I can rev it with the TPS unplugged.

When I try to drive the car, I cant get it over 1800 - 2000 RPMs, but can get it up to about 35 mph by short shifting it and being easy on the throttle. I did this with the TPS plugged it to check for DTCs. It did have a coolant temp and iat codes that I sorted out and they didnt come back. I unplugged the battery for a while and drove it again and it didnt make much difference. If I drive it with the TPS unplugged it drives better, but like crap if the turbo starts making any kind of positive pressure.

Just wondering if I am wasting my time chasing this down, or if something could be up with the car. I would hate to waste the tuner's and my time trying to get it tuned..


Thanks for the help.