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Problem SOLVED! 200 1992

posted by  Amarin on  Fri Oct 16 10:49 CST 2020
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

Good to hear that! You got your idle back!

The ON823 Darlington, made by Philips is unobtanium nowadays. It could only withstand 80V collector-emitter voltage (safety headroom for injector voltage back-spike). Bosch used this in my spare -934 ECU. In the -935 ECU that I'm currently using the component had been updated to BDX53C. This Darlington could withstand up to 100V (same for TIP122). Good news its still available at most online parts store. Bog standard caps with prescribed value is good enough for replacement. Using low ESR caps might get the LDO regulator into oscillation. And take care in desoldering the caps (transistors too) as the old copper traces might delaminate with undue heat.


Regards,
Amarin.






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