Ecumaster forum

So I have done some parts swapping and testing, I may have a faulty IACV motor. When the engine is ready to stall I compensate by lightly pressing the throttle in. The car will "idle" then the "idle" will rise and the AFRs will lean out slightly before its corrected like the IACV motor was stuck and...

Thanks, when I read that in the book I didn't pick up on that.

So the CEL came on with the 92 ECU as well, I haven't check the code yet but I fear its the same...

I'm using the pull-up now.

I'm still investigating this issue. I will keep updating as needed.

So swapped the ECU out with a 92 unit, and the CEL is gone. However the engine still stalls, I think the 1UZ programming just doesn't like the modded freq signal.

I know the earlier ECUs had capacitor problems, but the architecture of the latter ECUs does differ. I will check mine out.

O2 sensors are still connected. Its currently in blow through, the BOV is pre AFM. I think the ECU is going bad, I have a CEL with no codes now. I'm going to swap it out if I have another ECU handy and see what happens. I think I may have caused damaged running the wrong impedance injectors for a wh...

Do you have the DET3 modifying the timing degrees?

Since I wasn't able to get the engine to run with FI, I went back to freq modification. I put the stock AFM back in and updated firmware to the standard DET3. So far I've found the freq in from the Karman Vortex sensor for the 1UZ produces a range of ~5Hz - ~1300Hz with 5-6lbs of boost. My initial r...

Yes that was the fuel implant version.

I've got everything set up but I cant get the engine to continue running, it starts then stalls when it reaches afterstart mode. Not sure what to check at this point.

https://youtu.be/YoVagk0lmI0

The IAT wiring is not polar, so either wire can go to either pin.

Hi all, So I was looking over the FI manual, specifically the NGO section. If you’re specifying a target voltage, why does the sensor have to be a narrow band o2? Does the voltage range of the Tables Switch (Pin 2) have a limit that would not allow a 0-5v wideband input? Or is it something in the ba...

For testing I used the DET3 5V reference, once I had the correct resistor selected I double checked where the sensor would be installed utilizing the harness wiring and ECU 5V ref. It had a slight voltage drop from the extra length of wiring but was so close I felt it was good. The attached wiring d...

None on that particular item.

I've made my first step towards FI, I got the IAT working. My next goal is to do the necessary wiring for the other req. sensors. I will updated once completed.

With some input from Zach I was able to figure out I was referencing the wrong setup procedure. I was able to get the sensor to read correctly by using a 4.7k resistor on the 5v supply. I tested a few other resistor values but the 4.7k was the closest to the ambient temperature when tested. I'm now ...

The wiring for the IAT is sound. I swapped out the DET3 with another unit and got the same results so it has to be something external, either the .def file or other wiring/other sensors. I will try swapping the IAT with another input, if that works then the challenge will be in FI mode, as the input...

I just put the ECUM IAT sensor in and I got the same results... Can you upload your .def file?

I swapped it out with a new unit, same result. I just got an order in for the ECUM IAT sensor, so I'm going to hook that sensor up and see if it reads correctly. The last thing I can try is swapping out my DET3 with another unit.

I'm using GM Temp

So, I have been battling with my GM style IAT sensor (photo attached), I'm curious. Does the .def file included with the DET3 software only work with the IAT sold on ecumasters.com? When I have my sensor installed I see 4.980 volts, when I disconnect it I see 0.0 volts (go figure). The resistance te...

Yea, this is interesting. I looked at the inputs you can use and its a freq in/out as well as two others.