Thanks! PM sent

THe variable idle was solved by unplugging the CIS frequency valve. It would be ticking, turn off for a few sec, then start ticking again. Not sure why- maybe something with the ECU/lamba O2 sensor? Either way, for better or worse it is idling steady now. Probably not as fuel ...

Thanks. I put it back on. The variable idle I traced back to the CIS frequency valve (K-lambda). When it turned off the idle would rise. I unplugged it and the idle is steady ~800-900. Maybe something with the O2 sensor isn't right.

I already checked the fuel pressure is good, and it keeps ...

Well I took the old cold start valve off and tested it with the output test - looks like it works. But, not sure if the spray is normal/enough/etc.

Took a video of it -

https://www.youtube.com/watch?v=wqgW0i7sh04

Can anyone tell me if this is normal operation? Starts at 22 seconds in

Well it's cold out again and it's hard to start. DE80q - if you do find that cold start injector let me know!

When I did get it started on that warm (40F) day, seemed like the idle was jumping up and down. I took a video of it:
m

anyone have any insight?

I did also get an S&G gauge kit - it ...

awesome, thanks, i'll send you a message

Thanks. Found a leak in the PCV system - a 3 way rubber tube had a tear in it. I just plugged the crankcase vent system where it attaches to the intake manifold to disconnect it from the system. Also, weather is in the 40's today - up from 20's!

Car started right up! That was probably a vacuum leak ...

Thanks I'm going to try working on it this weekend. Any particular areas that I should look for vacuum leaks other than, well, all the rubber parts/tubes?

oh, ha, just read your post again. I guess those are the differences.

I got a S&G kit to test the K-jetronic CIS stuff to look into why it doesn't start.

I think it has a MAC-14 ECU.

I did a output test - fuel pump turns on, freq valve clicks, wastegate clicks, carbon canister clicks, but cold ...

Just checked - it's a 2 knock sensor motor. Anything different I should know about?

Picked up a 1990 Audi 200 10VTq.

Doesn't start, trying to figure it out. I got the bentley manual's that I'm reading though.

As far as I can tell (based on pictures) it is a 20v MC motor?

https://i.imgur.com/H8HXM66l.jpg

https://i.imgur.com/937RVQPl.jpg ...