Re: 1987 760 only starts once a day! :-(
Here's a post I made last week, in response to the "1990 760 Turbo wagon dies at random!" thread:
I had a hot-start/run problem in my 1989 760 turbo that proved to be the
"charge air overpressure switch". Basically, it's a vacuum switch that cuts
power to the fuel pumps if your turbo is blowing too much boost.
It's the first powered link in the fuel system after the ignition switch,
and if it's faulty it's a real bugger to diagnose. I just bypassed it with
two alligator clips and a scrap of wire, and the car starts and runs fine
now. IPD doesn't sell it, and my local Volvo dealer was no help in trying
to order one.
The Haynes manual (which only covers up through '88, I believe) had the part
living up under the dash around the brake pedal cluster, but by my 1989, the
Volvo engineers had moved it to a strap on the coolant overflow tank under
the hood. I suspect it was the dramatic heat cycles that killed it.
Best of luck!
"dave422x" <email@example.com> wrote in message news:firstname.lastname@example.org...
> Hi people
> Hope this hasn't come up before and I missed it....
> Last week we bought an '87 760 wagon (turbo, although the turbo bit
> doesn't work... ahem, anyway....) for $650. On Saturday it died :-(
> major overheating, leading to me noticing the rubber grommet that the
> temperature gauge lives in had either blown out / popped out / was
> never there, and so adding 7 gallons of coolant made no effect, except
> to make the floor green!
> Anyway, got a rubber grommet form a local repair shop and fitted it.
> Coolant added this afternoon and the reservoir seems to be holding it
> Now to the reason for my post.... the car will only start once a day
> (this is all since Saturday - it's Wednesday evening now - before the
> weekend from hell it started fine every time, just needed some gas in
> Park in order to idle "unaccompanied"). I'm assuming that perhaps it
> needs to be practically "ice cold" (ie lots of rest between starts) in
> order to start? Even a half mile trip makes it not want to restart.
> Today we bought the Haynes manual so I'm thinking of checking the spark
> plugs and (I think they're called) HF somethings?
> Natch you can probably tell I'm not a techie (well, with cars anyway!
> Give me a broken computer or a broken guitar and I'm fine! lol), so
> what do you learned people think? Check the sparky stuff? Or maybe
> there's another reason why it needs to be well rested? We went back
> about 90 minutes after it ran and it still wouldn't start. The ignition
> is doing its chigga-chigga-chigga thing but the engine just won't
> Any and all help (but PLEASE not "scrap it" cos we're really broke! We
> really want to get this thing running!) is appreciated.
> Many thanks in advance