Thread: I have a 1990 volvo 740 turbo that has began to knock and blow out white smoke....

wow, i had a 740 wagon, loved that car, but it is dead now, it had over 300k miles, sold it for scrap when the head cracked. u can fix it, there is some stuff for 100 dollars that fixes cracked aluminum heads, sorry cant help, my girlfriend is a maniac tonight,,,

could be bad.

white smoke indicates head gasket,blue smoke is rings and black smoke has to do with fuel problem

wow, i had a 740 wagon, loved that car, but it is dead now, it had over 300k miles, sold it for scrap when the head cracked. u can fix it, there is some stuff for 100 dollars that fixes cracked aluminum heads, sorry cant help, my girlfriend is a maniac tonight,,,

white smoke indicates head gasket,blue smoke is rings and black smoke has to do with fuel problem

could be bad.

blown head gasket or burning antifreeze

blown head gasket or burning antifreeze

Probably low oil pressure causing the knock or the main bearings are worn out, the smoke is from the rings being bad, u need to have it rebuilt or changed.It will stop running if not looked at soon.

White smoke is usually a bad head gasket. If compression in 2 adjacent cylinders is lower than the rest that is a pretty good indication of a bad gasket.