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Let me redefine my answer from a long time ago, education always helps.
The 850 engine, like most other cars, uses a lot of gasoline on an initial cold engine start. If the oil does not heat up and splash the rings soon, the compression will drop.
So, the LMS begins by starting the car, moving it a few feet, and turning off the engine. The next start attempt will again wash the rings with raw gasoline, and guess what - compression less than 50psi!! The rings and cylinder walls have no oil left on them. Subsequent start attempts make it worse, because if it doesn't start in 5-10 seconds of starter grinding, the operator looks for something wrong and the condition gets worse.
There are 2 solutions:
Pull the spark plugs and pour 2 tablespoons of oil into each cylinder, put the plugs back in and wait a few minutes to let the oil coat the rings and cylinder walls. Start the car the normal way, extra cranking might be needed, and let it run until until the smoke stops coming out of the tail pipe.
The other way is to floor the gas pedal, turning off the injectors, holding the pedal to the floor and cranking the starter until the oil pressure warning light turns off. About 30-60 seconds. Stop. Restart the engine, it will normally start firing one cyl at a time, so crank until it sounds like it will run with just a little gas pedal pressure.
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My back feels better when I sit in a Volvo seat
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