hey guys,

I actually had the same issue on my VT turned out to be a corroded and broken wiring for main PCM power on the chassis side of the 3 plugs on drives die engine bay. might be worth a look? what happens is water runs down the windscreen onto the cowling and down in behind those plugs.

I have been looking into fitting a speeduino to my boosted VT however how would it work with body input/outputs like A/C inputs and outputs and oil pressure light?

Thanks VL400, I'll have a play with it but i dont think that will fix the issue i'm having. when logging tunerpro only reads 16.85 static no change across the board it just plots 16.85 over the load table.

Thankyou heaps Holden202T, I only discovered the wideband reading 16.85 static when i took the log. I have the wideband setup using the YELLOW anaglog 1 setup as per your screen shot. Even with the wideband disconnected the table still reads 16.85 so im not sure whats going on. I have douvke checked...

I have attached all the tune files i'm using plus a log of a short drive

Thats correct holden202t,

I will take a log this arvo and post everything when i get home.

Iv just measured the voltage to the PCM and its 2.1v when the gauge is showing 13.4, i also removed the sensor and while it was in fresh air i reset the cal and when it was reading 22.4 i took another reading and it was 5.09v so to me that all seems right. It must be tunerpro setup?

The formula is right, the analog output the ECU is reading is inaccurate of what the gauge is reading. when u change the formula to match its fine, then try to log again and the numbers dont match

Okay so I have now test with multiple ground locations and all of them give the same result.

This is a photo of the wideband percentage difference for correction of the AFR's, you can see the wideband is 14.0 in the background
https://imgur.com/a/TXHuT9R

As in grounding the mtx-l to a ground that is going direct to the PCM?