I'm finishing up a 16v swap into my 81 jetta
I decided to keep it CIS basic (not lambda, no Oxygen sensor) but wire in the knock box with the throttle body switches intact
the original engine did not use throttle body switches, it had an elaborate system of vacuum lines and reservoirs
I believe I have 2 separate issues, and i'll try my best to describe them
issue 1) it starts fine when cold, but won't idle and dies if you don't give it constant throttle
issue 2) if you can keep it alive long enough for it to get warm, it cuts out and won't restart until it's cooled down again
the engine WILL idle if i unplug the break booster vacuum line, although it idles very high, making me think the idling issue has to so with a lack of air flow
the 8v that was in it before had ZERO issues, it was just lame
I'm using a standard CIS throttle body, not the scirocco or CIS-E style. it has an idle screw and the rubber washer is new
all of the vacuum reservoirs and lines have been removed, any open ports have been plugged, including any from the throttle body (and yes, i've double and triple checked)
I'm using the original fuel distributor, with a larger metering plate housing
the head has a thermo time switch in it to control cold starting, it has the cold start valve, it DOES NOT have the aux air valve installed. it also, obviously since it's CIS basic, DOES NOT have an idle stabilization valve
it also has a coolant temp sensor in the head next to the Thermoswitch, but it's not plugged into anything. I assumed since the original CIS didn't use one I wouldn't need to use it here either?
with CIS basic, if the advance has been changed to be controlled by the knock box, not vacuum, are any other vacuum lines necessary? or the vacuum reservoir (group of tennis balls/bubble looking thing)?
the engine had no hot start issues before, i've been reading about the accumulator valve in the fuel pump but if it was fine before i can't see why that would be the issue?
I hope someone can help me out with this