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How did you go borrowing an NA6 ECU? In case you haven't been able to borrow one & are not aware, you can buy a second hand NA6 ECU for under $50 on this forum. I know it would be better to borrow one, but if not possible then there are cheap ones out there. And they are occasionally a problem in NA6s & NA8s, so def worth considering as a cause. Sometimes a visual inspection of the ECU printed circuit board will reveal a problem as the board or earth post can show signs of blackening or discolouration, often a brown colour, from leaking capacitors.

Hey mate. If you're still stick, send me a pm. I'm in adel and have a stock na6 ECU you can try, as well as a aftermarket ECU connected to a stock loom that we can use for diagnostic purposes.

I'm free after 6pm weeknights. If you're up north I might be tempted to drive around and have a looksy