Hey every one (who owns an S70 [99]).

My my wife has a 99 S70 that we bought in 02. It has about 170K mikes on it. We’ve maintained it well and use premium fuel and synthetic oil with regular maintenance.

The car had been sitting for a couple weeks so we took it for a spin and it wasn’t firing on all 5. I put my 99$ analyzer on it and got a “misfire cyl 5 code p0305. I took it to the dealer. “Burnt exhaust valve”. (Which one, he didn’t say).

Why just one one valve and, what happened to the debris? We just put a turbo in it and wondered if that is trashed.

History: last year the oil consumption went way up but the car ran fine. Had great compression and lots of power. I figured there was a bad seal in the turbo and oil was bypassing and going into the engine although I never noticed any smoke. I was told that the CCV would neutralize the excess oil. Took it to a tech who said that I was the turbo and that the engine was fine with great compression. With the new turbo we encountered lots of smoke and oil consumption. Turned out to be unit that scavenges oil from crankcase. Fixed that and ran great.

So so the question is why did we burn a valve on one cyl. I’ve seen in the forum here theories that the 99-2000 S70s ran a bad batch of exhaust valves. I wondered whether the oil from the turbo could have had something todo with it. I suppose we’d be taking a risk of the turbo being damaged as well.

Whats all your opinion on causal factor and repair. My tech says about $3K. New exhaust valves, (10) probably a water pump, timing belt And labor.

Thanks.

 

Your post hit a nerve with me as I’m struggling to decide what to do with my own car.
I have the same issue for the second time on my 99 s70 t5.
Now it’s sitting and I don’t drive it anymore. Been sitting for almost a year now. Cars getting into more and more rougher shape.
I can’t really give you a technical answer but just wanted to let you know that I’m in a similar spot. But my car has 290 k on it.
I don’t know what to do because I’m hesitant to pay the high labour cost to any mechanic to do the work it’ll cost me at least 3-4 k. At the same time if I sell this car I’ll be lucky if I get 1000 for it. It’s almost an enthusiast’s car. And it has so many little issues inside and outside that I feel if anyone came to buy it it’d be a turn off.
Is the repair soemthing I could tackle on my own especially if I do it slowly ? as I’m in no hurry because I have another daily driver.
The parts are not the majority of the cost the way I see it, it’s the labour that costs about 1500-2000 in my opinion.

 

Hey,

I got some more information. The burn’t valve is one of the two exhaust valves on Cyl 5. The theory is that a speck of carbon from burning oil through the turbo seal ended up fouling the valve seat allowing hot combustion gas to impinge the valve above the cylinder and burn the parting surface between the valve seat and the valve surface that mates up with the seat. The theory also goes that it’s just the luck of the draw as to when this happens if at all. I suppose using a treatment that keeps carbon from building up is probably good medicine.

Im most likely going to have a shop near Lancaster PA that specializes in Swedish cars do the work and hop to keep it around $3K. We’ve spent lots keeping this car running and just don’t have the budget for a second car loan.

Thanks and and good luck with yours. If we didn’t have so much into the car we’d probably part it out.

 

I would not put much money into fixing it; that MY had lots of issues beside burning valves. Only way it'd be worthwhile is if you did your own work, but that doesn't sound like that's an option. The $3k you were going to put into it would be better spent toward another car IMO.