After years of faithful and reliable starting, my '93 940 Turbo (wagon)developed starting issues that turned out to be based on the ambient temperature. Prevalent late last summer and vanished in the late fall when the temperatures dropped. Originally I associated it with the common warm starting difficulties brought on by all of this ethanol nonsense. . The difference being that this car became difficult to start the first time of the day when it became warm. Once started, it behaved normally for the rest of the day. All the time running the way that we all have become to expect of our Volvos.
This summer, I had to dismantle the intake assembly and apply a healthy dose of ether for it to start and run normally. The local mechanic that services imports and is well versed in Bosch fuel injection has become flummoxed. Of course, it started normally for the first two days that he had it but began refusing to start the afternoon I was going to bring it home. I left it for hime to assess.
He has assessed that there is no fuel pressure on start up but says that he has no documentation for this car nor the proper fittings to measure fuel pressure. I suspect fuel pump issues or the gizmo that sets the mixture for starting but then, I am not a mechanic. My Saabs had a "warm up regulator" which always assumed was this gizmo. The mechanic further explained that lack of oil pressure on start up may well be a culprit. After showing me a simpler way to inject fuel directly into the intake (through a tiny nozzle/tube fitting at the top of the manifold assembly), he sent me on my way to inquire of you all as to what may be going on. Just yesterday if refused to run altogether. My manifold injection trick would cause it to start but not run. (Once it consumed all of the fuel?).
Anyone with suggestions as to what is going on would be appreciated. Volvo dealers are few and far between in these parts, , so it is a good thing that we seldom need a factory mechanic.
Thanks,
Barrelhouse