I have received a promising response, so I'll box up a DJ engine harness, a couple of idle valves and the two duff controllers and see what they make of it all.
I'm still keeping my eye out. I'm certain I wouldn't have binned it and both my 2.1s were running fine when removed.
I found lots of bits of harness in a box the other day so I'm getting warmer I think.
1992 T3 LHD Syncro 16" 4 door doka 1.9na diesel
1990 T3 LHD Syncro 16" Westfalia Joker high top 1.9 TDI
1985 T3 LHD Westfalia Joker high top auto 1.9 Digijet 1980 T3 LHD factory high top 2.0 Aircooled
Yes thats the early suffix A, there's a cap on the other board that has also had a blurt. Strangely the suff C I had been using shows no signs of component distress or dry joints but it won't drive the idle valve either.
Might be that the transistors have failed.
Suff A and C have quite different board layouts and component count, but do the same job (as do suff B and D for the MV with Digifant)
Last edited by silverbullet on 22 Jul 2026, 12:44, edited 1 time in total.
i was chatting with copilot about this, and a full re-engineer with just a modern microcontroller and as few simple components could replace all the analog components. it seemed to have a fair idea of what was needed, what inputs are provided and the PWM drive for the ISCV.
Discrete components are easy to repair though. I don't trust Artificial Idiocy to return meaningful results on this sort of thing, much prefer to use human experience and wisdom.
Received the invoice for repairing the two Digijet idle controllers that I sent to Avilec.
In the event, both needed repairs to the idle air valve driver components. They noted that suffix A and C have not only different board architecture but also function rather differently to get a similar effect.
Bottom line: £120 each + post and vat...not including the core value.
Which doesn't really make them a commercial proposition to my eyes (I'd have to mark them up otherwise for business) but they are repairable which is good news.
