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I was driving and suddenly there was smoke coming from the center console. At first I thought that it's radio, but the smoke just kept coming and turned out that it's the ecu. It was really hot, but unplugging the wires and letting it cool, I did get back home without it getting hot again. Now the idle is pretty poor/no idle at all. Are these transistors related to fuel injector circuit? I saw a ecu pinout and it suggested that, it was for different year though. What could cause these burn? Car is 1994 2.0. If I get new ecu, does it matter if the serial number doesn't match? As long as it's in my case for 2.0, manual transmission and same year, it should be ok?

What’s the part No. on the ECU
Is this what you need



Kit

That is exactly same part number as mine. I have few local sources where to possibly get the ecu, if they don't work out, I get back to you. How much it would be shipped to Finland?

What Finland
But yes,
If you give us a address/post-code , I’ll get a cost.
I’ll be surprised if you find one

Keep in touch

Kit

Did some measuring with multimeter. Turns out that burnt transistors middle leg is connected into IAC valve green/black wire.

Best check that has a meaningful resistance and the solenoid is working properly , or else it will happen again.

What is the correct way to measure these valves? The one in the car was ~4.0 ohms, spare one in the picture below 14.5 ohms. Haynes manual says about 7.7-9.3 ohms.

I would believe the reading of 14 ohms rather than the Haynes figure.
Almost certain it is the old IAC that killed your transistor.

Did check the spare one again and now it was ~10 ohms, so that seems to be ok. Now I have to decide if I want to hunt new transistor and replace it or just buy new ecu Would be shame tho to replace otherwise perfectly working ecu. Thanks to everyone who helped.

You can have one of mine ECU’s, for the cost of the postage + a small donation to UKPOC funds

Kit