J Sweet: good news

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

 

Are you *sure* the sensor is bad? I've seen the wiring crumble, but I've
*never* seen the sensor fail, or even heard of one failing.

 

Come to think of it, it was the motorheads who we bought the car from
who said its bad. I am going to pull it out and check it. Have never
really checked the wiring at it. Thanks....you might be saving me/him
lots of $$$. It may be a fix like I found on the crank sensor on my
defunct 740 sedan...just had to repair wiring where it goes into body
of sensor.