SHE'S BACK! **Touch Wood**
So after a farcical 2 and a bit weeks, it seems I've got it running right again. After smashing the MAF, I bit the bullet and bought 2 used ones. Tested them with no load on the engine through the Consult software & all seemed fine.
Then I noticed one of the O2 sensors was reading 0 Volts. So set about finding 2 new sensors. What a ballache that was, nowhere in the UK had stock of them. Found some in the USA, but they emailed back saying they only had the rear (the front has a different plug.) Found out they were the same sensor, so just got 2 rears. Then waited almost 1 and a half weeks for them thanks to our joke of a customs/postal service.
In the mean time, I'd had the ARC box out to do the MAFs, so I decided to ditch the carbon canister...
And ran the fuel tank vent down to the front arch...
Far better. Rebuilt the MAFs/ARC (along with new front filter in the ARC), then set about removing the old O2 sensors. Now, must are an M18 thread (22mm socket). Not these, they're M12. So I manufactured a lambda socket out of a 17mm deep hex. It needed deepening after this photo as it damaged wiring, but that only mattered for the new ones...
Then yesterday the replacements arrived, and I tried to solder the old front sensor's plug to the new rear sensor replacing it...
Only then I discovered solder doesn't stick as it's high temp wire! So today I've had to go buy a crimping tool & crimps. Wired it all up, fitted both sensors, and now it seems fine!
Hopefully now I can stop worrying about niggles and get round to a bit of modernising & making it my own. Not that I've got the time to ATM with covering people at work on holidays.