Stupid 740 Q's

[Barry Duquette]

Hello,

Got my ' 87 740 Turbo Wagon about a week ago. Nice car, runs well,
about 260k on the body and 150k on the motor that came out of a smash
up. Cool!

So the tach doesn't work nor the temp gauge, so I figure they forgot
to hook them back up. After Googling around I found out about the
temp gauge connector being under the manifold, good enough - and the
under dash part of the tach, but why would they go there? What does a
guy look for under the hood. The info was conflicting about what
unconnected thingy I'm after. There aren't any loose connectors that
would go to the coil that I could see.. Any thoughts?

And the tragic part, the power antenna, got the rest of the stereo
hooked up, no Volvo amp. Found a couple of bit of info about what's
what and it's right. So the power antenna wire from the stereo goes
to a red wire on the car. That's there, but the red wire comes off
the car side to another connector and goes to nothing. Couldn't find
what may mate up to it under there anywhere. More digging perhaps?

I read alot about wire rot under the hood on this vintage, maybe I'm
lucky as I didn't see anything like that, should I spray the wires
with silicon or something similar?

Best,
Barry

 

[HankL]

sorry blurp - you are probably hearing the turbo boost
and not the vacuum. I think the cruise problem is electric,
at least on the newer models it is, ask someone local to
show you what the one way vacuum valves look like and
replace the faulty ones. When you accelerate - there is no
vacuum with a turbo. That is the reason for the one way valves,
they keep vacuum in the system when the turbo is in the
boost mode. Should be a $10.00 fix.

 

[John Robertson]

P\S BEFORE you spray silicone near the motor consider the oxygen sensor it
will die a thousand deaths at a mere suggestion of silicone .