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The engine in my 1991 740 won't start. That is kind of to be expected as I let it sit for three years after it overheated. I took it apart withing a few days of the overheat, but did not put the head (overhauled, and resurfaced) back on until much later). But I'm trying to start it up now and it won't start.
The car has spark aplenty, and there is fuel getting to the fuel rail (haven't checked the individual injectors yet - spraying gas = yuck, messy, stinky).
Today I checked the compression on all 4 cylinders, but had to do it with the engine cold because it would not start. Here are the readings:
#1 122 psi
#2 125 psi
#3 145 psi
#4 145 psi
Do any of you know if these readings are okay for a COLD engine? Or do you know if warming up an engine will make the compression readings go up or down?
None of the cylinders lose pressure for the few seconds that it takes for me to digest the readings then clear the pressure in the gauge.
The gauge is probably not that accurate, and #3 looked like it might just be nearer 150 psi. But still all the cylinders are probably within the Volvo spec of ~28 psi of each other. My only concern is that when checked COLD, #1 and #2 are too low.
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1955 Human, Scott; 1991 745 Turbo, Thunderbolt; 1990 745GL, Posideon
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