Question> My 1987 760 turbo volvo is lacking power. When I press the accelerator
> down to the floor fast it wants to die. When I am going up a hill I slow
> right down, even on a level road it takes time to get up to speed. The engine heats up quickly and it will stall. I have to let
> it cool down before it will start again. I have replaced the spark plugs
> and wires , coil wire, distributor cap, fuel filter. Fuel pump,fuel
> pressure, coil and the catalytic converter were checked. I unplugged the
> oxygen sensor nothing changed. I unplugged the air flow sensor and there
> is quite a bit of improvement but not near the power I should be having.I found a hole in the hose that runs from the turbo to the air filter and fixed that. I unhooked the battery for the night. I
> took it to a mechanic and he could not figure it out. There is not a
> dealer any where around here to take it to. What am I missing that is
> causing the problem.
> Thank you in advance for your time.
AnswerOverheating and loss of power is either two problems or one. Don't know if it came on at same time. Make sure compression is good. Check all your turbo hoses to make sure there is not a leak somewhere. Watch your boost gauge to make sure it moves to indicate boost is coming on.
Also check your exhaust to make sure it is not clogged, this is done with back pressure checker tapped into exhaust pipe somewhere.
If everything checks out, you may have a bad air mass sensor, but check everything else first.
