I fixed the no-idle problem with the brothers' 92 740 gas/turbo wagon.
A new crankshaft/speed sensor did not fix it at all. So I thought, you
know, a no-idle condition could be caused by a air/vacuum leak. So
when I checked it, it had only 12 in at 3000RPM!  So I checked
everything around the intake manifold. Underneath....COMPLETLY out of
sight, I found  that the approx. 1 in dia air hose going back to the
manifold from the air control valve had come apart where it was joined
together with a metal  nipple. HUGE LEAK of unmetered air!Those
motorheads that installed the engine before we bought it only put
tie-wraps on it to hold both sides of the air hose on! Put it back
together, and now it runs fine...at least sitting still.  Of course I
really still have to resolve the timing issue...the cam pulley is just
set experimentally to where I got it to run. So if it pings or runs
poorly on the road, I'll know why.
  He is talking about selling the car to me for $500. (I need a
second car)  I don't know....I know too much about the condition of
this car. On the other hand, there is not $250 a month for a new or
low-miles/nearly new car.

   James, it is needing a new speedo sender....the one driving the
speedometer (in differential). The on-line supppliers I checked want
about $90 for one (ouch!).  The pathetic salvage yards here don't have
one. Even if they did, they would check how much a new one is, and
price it only a litle less than that!   Any ideas?

Thanks for your input,    geronimo