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With some help from zzperformance I was able to flash a factory manual tune onto the ECM which has at least resulted in speed reading zero! I still don?t know for sure if the sensor reads properly or...

Thanks for the quick feedback. I don't have any idea what transmission the vehicle had. I tried searching by the vin, but the transmission didn?t show. That said, based on what you are saying I bet...

Hi,
I'm trying to resolve a long standing issue with my setup --> VSS stuck at 158mph. I see a lot of mention of this with swaps using the E38 PCM, but I'm not sure I have the right solution. Lots...

Yeah, I think you are right. It has been a few years since I did this. For some reason I thought that was introduced with the E39, but I guess not. What is for sure is Alpha didn't find this sensor...

I never worked with a remote tuner. Alpha was able to get my car running and I took it to a local shop for tuning.

The main issues I had with what Alpha did was they missed the pre-throttle sensor...

I'm surprised by this. Can you double check that your calibration is still showing a manual transmission (in the general tab of the trans cal)? I've played with that some and when an automatic...

Bringing my thread back from the dead!

I have about 3k miles on the car now and had it tuned at Church Automotive in Long Beach back in April'19. The resulting dyno is attached.

A few things...

Are you sure about this? I'm still new to this, but engine vs. wheel tq will be gear dependent. If we ignore the trans/rear-end multiplication of TQ then really all we are talking about is the...

Negative TQ is motored. Every time the wheels are spinning the engine the TQ is negative. You want to allow this to happen. For example, if you have zero tq at max engine speed and zero throttle it...

I really cannot say who was at fault here, the harness manufacturer or the vendor that sells the system. The harness manufacturer can claim they made it to the vendor spec. For me it?s odd that these...

log attached. Any thoughts?

Daniel

Holly crap is it hard to keep my foot out of the throttle. I?ll post the log later, but I peaked at ~16.8psi map and 5000rpm and I thought it was already fast. I do appear to have a boost control...

I have closed loop! Sending the O2 sensor ground to the ECM is required. My LTFT is already at -25% at idle. It seems I was still running rich.

My high pressure fuel pump is making a clicking...

The lack of resolution makes sense. Does anyone know how high the voltage can go on the O2 signal before the ECM is damaged?

Are there any other input channels on the E39 ECM that the wideband...

Thanks for the reply. If commanded is what the ECM is asking for then what does it compare to? There must be an O2 voltage for stoich somewhere in the calibration....right? If I set the wideband...

What does "commanded" mean? I found AFR and equivalence ratio commanded. Is this the conversion of the O2v to AFR/equivalence-ratio or is it the requested value from the ECM? If it's the requested...

I think I've figured out the root cause. My ground wire for the sensor is sent to ground and not the ECM. Apparently the E39 has a pull up circuit on the O2 ground wire that is 0.9-1.1v (reference:...

I sent you a PM. I'm having the exact same issue with my O2 signal and I'm hoping you found the solution!

Daniel

Well, for some reason my ECM is reading almost exactly 1v lower than the input voltage (for O2). I apply 1v and get basically zero on the log. I apply 1.5v and get 0.5v on the log. Any ideas?
...

I decided to drive the car around in open loop. This actually worked better than I expected. I was able to drive it on the street well enough to complete my brake and light inspection. I've scheduled...

Just a quick update, I tweaked the MAF calibration and got the car to idle pretty well. I pulled almost 40% fuel to get this. The O2 issue still isn't solved because I've not been able to get another...

It's good to see another stand-alone application running the ecotec. May I ask which ECM you are using?

Daniel

Welp, I just tested the last two O2 sensors and they both generate the expected voltage when heated with a blow torch. I guess it?s time to test the ECM.

I made a video of me doing this test. I?ll...

Thanks for the input. I really appreciate the thoughts and time. The harness was not designed by me so I?m relying on the company I bought it from to tell me what sensor it is designed for. The...

Well, no dice. The new sensor acted just like the others. Damn. What now?