Have figured out why the various fuel lines I've got for the Lada don't fit.
They *do* fit - but the metal bits didn't come with them...So I'll need to adapt what I've got. Now I *know* that, not a problem...will get some 10mm flare fittings and look at getting that sorted soon. I'd foolishly assumed that the pre-shaped rigid "tails" would have come with them. My mistake.
I've got a circuit pieced together on a breadboard upstairs to operate the check engine light, will need to bring it out to the car at some point shortly to see if it actually works. It's not doing anything fancy as it's just providing the same functionality as the original from the carb setup - so in this case it will light the check engine light in the following circumstances...
[] Lambda value too high OR too low AND vehicle coolant temperature is over 70C.
[] Vehicle electrical system voltage is LOWER than 12.6V.
So it should behave exactly like the original - comes on with the ignition, but extinguishes the moment the engine starts, and should then stay out unless something is awry. It'll ignore the lambda value until the car drops into closed loop mode (coolant temperature >60C), I've aimed for slightly above that to avoid nuisance triggering at the changeover point. Will be interesting to see if it works in practice.
I could just wire it in to the ignition light...but this should actually give me some useful diagnostic information at least, and puts my conscience at ease as it's not an MOT defeat-device...it's an honest workaround for the fact that my ECU has a stuffed CEL output.
Couple of comparators, half a chip's worth of 7400 series logic, and a handful of passives.
The question is going to be whether I have issues with this being sufficient to load down the lambda sensor input...Hoping the answer is no. If the answer is yes, that could rapidly become annoying.
Couldn't resist getting the Invacar out for a bit. Gave it a bit of a run around the drive, and can confirm that the speedo does indeed work. This "enthusiastic" behaviour and exercising of the brakes however then immediately swilled more gunk out of the bottom of the fuel tank, and I spent some considerable time trying to figure out why I wasn't getting any fuel into the float bowl.
Turned out the little screen filter in the top of the carb was full of rusty gunk. Now, these are far too big bits of crud to have got through the fuel filters or the screen in the fuel pump...so my guess is that they've been dislodged from the pump itself due to the higher fuel flow rate because I was actually using the throttle under real load for the first time.
Cleaning that out restored normal behaviour again, though if I were going to be using this fuel tank long term I think I'd just pay to have it professionally cleaned - I can't imagine it being that expensive. As it is, it'll not be getting used long-term, so I'm just going to keep an eye on things.
I also got fed up of tripping over the engine cover stay, which seems to have a talent for managing to get in the way irrespective of where I put it in the garage...so I solved this problem by reattaching it to the car.
That does a good job of suddenly making it look significantly less incomplete.
Can see why people often remove them when working on the car though - the cover doesn't open very wide - and the huge cool air inlet duct means that the first time you try to duck under the thing you inevitably whack your head on it.
Edit: Went out to get something later in the day, and discovered that for the second time in as many days that a bird's nest has fallen out of the tree next to our drive, and landed on the poor Activa. The heater now buzzes...that'll be bits of twig in the blower then.
Have I mentioned that I'm really sick of that tree...