HKSpoweredFC3S

So this seems to be a very common thing to happen after swaping a turbo motor in..
hmmm, hopfully that omp will fix it, that would be cool. I'm just curious now, im saving for a standalone atm, I would realy like to see how to fix it though incase i need somthing to fall back on.

but its definatly somthing to do with the sensors.

graniteguru

iTrader: (1)

Last night I did a complete test of the TPS and the AFM. As best I can tell, they are fine. The TPS did a nice steady sweep with a digital OHM meter and had the correct beginning (closed) and WOT ohm readings. It is basically down to the omp or the ECU. I have an old omp off of my NA. I think that this is them same on the turbo. Worse comes to worse, I will switch the two out. I really have a hunch now that it is the ECU as I was getting no volage out of pin 2b (AFM) when it should have had 1 to 4 volts.

dot_txt

iTrader: (1)

graniteguru: What kind of ECU are you running? Did you swap harnesses or use the N/A harness?

graniteguru

iTrader: (1)

I am running an N370 ECU. It is a JDM motor. I chopped the harness and brought it into the correct side of the motor for this engine. I have traced and re-traced for continuity between all of the sensors and the ecu and all are in order. I can't even begin to tell you how many times I have wrapped and unwrapped the engine/ecu harness.

I did just test the MOP and MOP position sensor. THe MOP seems to be OK according to the FSM except for one thing. At pin 2A, I am getting a reading of .9 volt. FSM says 1-4.2V. I tested another one from my NA and it is reading a slightly higher of .96Vat 2a.

At the MOP position sensor the one mounted on the car, I am getting .797 kohms vs 1.0-2.0 Kohms. All others pins check out.

At the MOP position sensor that is from my NA, I am getting no continuity at all between pin VO (connects to Pin 2a...the one that is low on the turbo that reads a little low.

This JDM engine threw the apex seals the first time I started it after installation. I am now wondering if the MOP was bad and it is what caused it to fail in the first place. I have rebuilt the motor with 3mm apex seals now.

On the NA OMP, that engine was blowing smoke like a mother when I took it out of service. I am wondering now if it was low on compression or just getting oil dumped into the combustion chamber from the bad OMP.

My question now is, is it a bad OMP or ECU?

immanuel__7

iTrader: (8)

well im getting a used omp this weekend, il test my omp some time this week, and il let you know how i make you by saturday night 11pm EST

texFCturboII

iTrader: (17)

No, no restrictor pill here; but I'm using an old school ProfecB boost controller so since that overrides the stock system I ruled the "pill" out in my head, but see how it works for you, maybe I am overlooking that in ignorance... that would be freekin sweet if that is all it was!

Get your injectors cleaned as well? I have yet to do so myself, but I was told that that could be a possibility explaining the uber rich running.

texFCturboII

iTrader: (17)

The OMP being out wouldn't have caused the motor to throw any apex seals, so you can rule the OMP out for that issue... however it is well known that a bad ECU will kill your OMP and vice versa. Replace both at the same time... preferably with knowledgebly working parts from the same car. Or just save up and go standalone and forget about it (AFM and all! )

immanuel__7

iTrader: (8)

well, the omp tested out 100% there was like 1ohm diffrence on some but nothing that far off, one or 2 readings had 24 insted of 23ohm i cant see that making my system go in limp mode? next il have to test my other stuff and do ecu pin tests. im so dang confused now

immanuel__7

iTrader: (8)

ok well here's an up date....... i tested all components and they all tested ok. so whats next? i figured Y not test each ecu pin outs. so i figured there no room on the passenger floor of the Fb i might as well pull all the ecu wires out and install the ecu out side so i can test and have access to plugs with ease. so thats what i did. i started down the pin voltage chart when i got to the part to test the omp at ide for 1V i started the car, and it seamed like it was idleing much better then it used to, and infect i did not have to press down on the gas peddle at all. so i take the car for a test drive after testing 3 idle pins that could effect the limp mode. and the car ran just fine never entered limp mode. so i put my wires back in the car and grounded my ecu and just left it sitting on the carpet and no more problems lol. i did fine one black wire with a small connector on it, it also has a rubber cap looking thing behind it im not sure where this plugs into lol but iwas touching the ground so i made sure it was sitting on a hose that could have been my prob tho, but ya im now able to DRIVE MY 3 YEAR OLD PROJECT. thanks for all your HELP.

HKSpoweredFC3S

Awesome lol, i might have to test mine out =]

graniteguru

iTrader: (1)

UPDATE! Turns out to have been multiple problems. Talk about a pain to diagnose!!. I ended up replacing the ECU and the OMP. I undid the entire engine wiring harness and made sure that everything checked out. I went to start it, and it started and then died. Classic symptom of a defective or not solidly plugged in AFM. I jumped the fuel pump jumper to make sure that the fuel pump ran when the ignition was turned to on. It worked, so I double checked the connections between the AFM and the ECU. All Fine. I then turned the ignition to ON and pushed the top of the AFM in with it connected. This should make the fuel pump come on. It did not. Then I unplugged the AFM and the car started. It ran EXTREMELY RICH, but it did run.

I have pretty much determined by now that the AFM is bad. I do have one last question. I have unpinned and re-pinned the afm plug. I would like to make absolutley positive that I have the pins in the right location of the afm plug. Can you guys tell me when looking at the 91 electrical schematic (the one that is in the FAQ for the turbo S5, is that a picture of the harness side (plug side) looking at it from the pin side or the back side?

Thanks for the help everyone. I think that I am almost there. Does anyone have an S5 AFM for a TII? One that they know is good that they want to sell?

immanuel__7

iTrader: (8)

i think this might be what your looking for sry i did not look at the post for a while been to busy working 14H days

graniteguru

iTrader: (1)

Thanks for the information. I am assuming that this picture is looking at the AFM itself and not the harness side of the plug. My understanding of the wiring and the locations is as follows(moving left to right on the plug): THA=Green/Orange, E2=Brown/Black(2 of these wires), VC =Brown/White, VS=Grey (shielded cable). Is this the way you see it? For all that are looking at this thread, this is for an S5 NA or Turbo. The S4 is different wiring.

graniteguru

iTrader: (1)

UPDATE to THE UPDATE. It finally runs!!. Thanks for all of the help guys. As I said earlier, this thing had multiple problems: OMP, AFM, ECU, Intake air Thermosensor, pressure sensor. The thing is, I may have caused it all. I started this thing a year and a half ago. To make sure that everything was right, I redid (took all the covering off of the wiring harness). At the time, I did not really know what I was doing with electrical and I assumed that a brown with white wire was a ground along with a brown with black. Boy was I wrong. Basically I wired the brown with white wire that is common to the pressure sensor, air flow meter, intake air thermosensor and TPS in with the Brown with black wire that is also common to many components(this is supposed to be ground). Result voltage of 4.95 volts at the brown/black wires at the components. This is NOT good. I think that I fried many of the components that I eventually replaced.

I had also connected a black with white to a solid black. I think that is really when the damage was done. Essentially I was not getting the signal back from the AFM because it was shorting out. So, it would start and die, just like a faulty connection from the AFM will cause. I am hoping to tune it up a little tonight and drive it this weekend!!! Yippee!