Resolved Idle surge 1G NA Europe

[meciora]

My 2.0 NA going mad at idle on cold, going to 3000 rpm and drops around 1200 and goes up to 3000 again again and again. First of I’ve make a free fiav mod, that help a little 2000 rpm and still surging, bought new isc from rockauto, ( no difference) rebuild ecu with new caps and clean it (nothing) . The biss screw is bottomed out and there is minimal difference when I mess with it. Could be the gasket inside the fiav? Please take a look, because tbh this car it’s driving me mad.

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[meciora]

Thank you for answer, so after your post I’m going to buy it.
Here is the hole sir.

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[steve]

Ok, That still looks to me like a bubble in the waxy conformal coating but I might think something different in person.

Any case make sure to get the capacitors changed on the new EPROM ECU before they cause issues.

 

[meciora]

Some update.

Got the new ecu, changed capacitors, clean it a little and After changing the ecu, I am really happy to say that there are no longer issues with idle, runs great.
And yes Steve, you was right about the bubble on the old ecu, it was not a „hole” it was just the coating, mcu is fine, so I believe c19 was the issue, or internal failure of circuit board.
Thanks again for help everyone of you. She is a runner!

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