94' 850 Turbo giving off blue smoke

[King]

I have a 1994 850 Turbo I love how it drives it has 300k on it and all of a
sudden it started to kick out blue smoke when idling and upon start-up. I
don't know if it is worth fixing or should I just be thinking to be getting
a new car. I know at this many k's I wont get anything for it the body is
in mint condition and was well maintained its a manual tranny still has lots
of power. The only other problems are the two headlights have small cracks
in them other than that the car is fine what to do?? (I really want to
keep the car if its worth doing) All opinions welcome!!

 

[Mathieu Paardekooper]

Hi, blue smaoke at your exhaust at start and idling looks to me as oil
consumption.
At start the engine is cold so there is a lot of space between the parts of
your engine and when idling the becomes a vacuum inside wich sucks the oil
in.
For older cars this is completey normal and there might be oil sucked in
between the valves and their housing
There is a rubber cap closing the space between the valve and its housing,
its placed inside the valve spring so you have to remove all valves which is
quite a job
(if other native english speakers read this and your a car mechanic then you
know what I mean, so please explain further).
You can ask your local volvo garage about this and find out what it costs to
fix it or maybe a specialized company can fix it for you.
Good luck!

a proud 480 driver

 

[jdg]

My 94 850 turbo has had a rough start/ no start condition and smoking
when it did start with misfires. I replaced cap, rotor, plugs, fuel
filter, ignition coil, tried a different ECU and fuel pump relays, only
to find that my spark plug wires were shorting to each other due to
failed insulation. Waiting on new wires now. You can get those headlight
lenses on ebay for @$6o a piece and easily change them yourself.

 

[King]

Thx.... Ill give it a try...

My 94 850 turbo has had a rough start/ no start condition and smoking
when it did start with misfires. I replaced cap, rotor, plugs, fuel
filter, ignition coil, tried a different ECU and fuel pump relays, only
to find that my spark plug wires were shorting to each other due to
failed insulation. Waiting on new wires now. You can get those headlight
lenses on ebay for @$6o a piece and easily change them yourself.

 

[AB]

Hi,

The two worst things it could be are the turbo and the rings.

To check the turbo, remove the hose that comes from the turbo and goes to
the intercooler. Check inside for the presence of oil. If it is oily the oil
can only be coming from the turbo so that could be pricey and may fail
suddenly. If it seems dry then the issue is most likely to be either the
piston rings are shot (but that tends to exhibit itself more as oil on
acceleration), worn valveguides or guide seals (tends to show as oil after
long period on idle or on overrun such as at teh botom of a hill when you
accelerate again).
High crankcase pressure (worn rings or blocked crankcase breather) can also
cause blue smoke.
As long as it isn't the turbo it is unlikely to fail suddenly so just keep
going!