debusan

I use a BNR34 fuel pump in mine with no issues.

Just wondering as said earlier in this thread the NEO TPS has 6 wires and only three are for TPS what are the other 3 for?

A small update If I disconnect the TPS harness under the hood the MAF reads as normal but that really doesn't help at all.

The joys of blowing the exhaust wheel out the tail pipe. Good times.

Thanks for the info I will try that later. I do know that I can completely have the MAF disconnected and the same voltage phenomenon occurs. However if the MAF is not plugged in the car won't start and run its a strange scene to be sure. It seems the MAF is still giving a reading but it is also reading from the TPS as well hence the weird voltage fun. Since I have wired the MAF directly into the PFC with my own wire that leads me to believe that the PFC is the culprit however I will do some further troubleshooting with your advice such as unplugging TPS etc. I will keep you posted on what I find.

So thanks to some info above I have uploaded a video of the PFC switch/test screen that shows the voltage issue in detail. I have a couple more things to check but I am starting to think that the PFC is the culprit as it is the only used part I installed in this car. Guess I need to fork over some cash then. http://www.youtube.com/watch?v=H31n2YUQjyc&feature=youtu.be

Yesterday I tried hard wiring the MAF into the Power FC I had the same result that was with me running all new wires straight from the PFC to the MAF. I don't have another Power FC and its a 1000$ to get another one in there. But if I must buy one then that is the answer. The traction control unit has been disabled. and the valve removed. so it should not be an issue.

I shot another video showing the match between the TPS and AFM voltages http://www.youtube.com/watch?v=FhMupBMDq1o&feature=youtu.be

i will go check the TPS voltage in a few minutes

I do see your point though The AT harness is heaps different and getting a MT harness may un-screw lots of these problems I have attached a shoddy video to show the symptoms on the hand paddle. I appreciate your help http://www.youtube.com/watch?v=vl7LBBoAFRU&feature=youtu.be

The car is a manual transmission now. It was converted from AT to manual

One other comment I would like to make is that my car is an AT/MT conversion. I am well aware that the AT harness has several pins that are not used by the MT or PFC ECU. But as far as I can tell from the wiring diagrams none of the pins in question are different between the AT and MT harness.

I ran new wires from the MAF directly in to the ECU ports for AIR signal and Signal ground. Same result. So it is not the wiring harness. Does anyone else have a Power-FC in a ER34 that can try this out. Turn the car to on but not engine running put the PFC into monitor mode for AFM and watch the voltage whilst pushing the gas pedal. Any help would be appreciated. Thanks for the replies.

Hello, Back in November I took my car to the tuner. I am running a power-FC on a 1998 r34 GT-T RB25DET NEO 550 injectors GT-RS turbine poncams Z32 MAF The car came back but has had issues running very rich (10.0) when cold to 50 Celcius Once warmed up around 80C the car runs fine (idle 14.7) except that when you punch the gas it studders then engages. I took the car back to the tuner and he says that it is having an issue he has never seen before. On the data logger when you push the throttle there is a momentary drop in AFM voltage then it raises as it should. The MAF is brand new and has been tested as fine in another vehicle. All of the other parts are also brand new. Also the engine was just rebuilt. I went to pick up the car today from the tuner again because he can't seem to figure out the problem. He left me a note that said that he had noticed something. If the car is not turned on and you depress the peddle the AFM voltage and the throttle voltage rise together and at exactly the same value. It seems there may be a crossed wire somewhere or maybe it is supposed to be like that. He said to check the harness. I was wondering if anyone else has heard of a issue like this before. After the initial pause the engine runs fine. It is just the initial push that has problems. Thanks.

Thanks I appreciate it.