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Dead cylinder V70-XC70 1999

posted by  someone claiming to be Bill on  Wed Feb 17 09:38 CST 2016 [RELATED]

About 150,000 miles on my 1999 XC-70. Engine running fine one day. Driving on highway, starts to skip, missing on one cylinder. Changed coil, spark plug and fuel injector. No better. Compression test 5 lbs in number 1 cylinder. No noises, no warning. Never have seen such a thing. Any ideas? Broken compression ring? Cam follower collapsed?








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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    Probably a valve. Question: what kind of spark plug are you using? Many years ago, people were installing multi prong iridium plugs. Sounds good until the iridium tips burned off and got lodged between the valve and head and stayed there!

    Pull the injector wires off the dead cylinder, the fuel is washing the oil off the rings causing it to leak gasoline into the sump. Then add a tablespoon of oil to the cylinder, wait a minute to let the oil get to the rings, and then re-try the compression. If there is no change, then the valve is bummed.

    You can still 'drive' the car if you also unclip the coil wires. No spark and no fuel to #1. But your car will need a 'head job'.
    --
    Keeping it running is better than buying new



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Thank you for your advice. It is not a problem from on of the spark plug tips; plug is intact. And, yes, I neglected the oil in the cylinder to help determine if it is a valve or ring problems. I am used to the old rear wheel drive, cast iron motors; had several with over 300,000 miles on the original and untouched engines. This car, as much as I love driving it, the handling and ride, etc, is on it's second motor in 233,000, and likely I will try and get rid of it and possibly look around for an older, more trustworthy 940.



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        posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

        Hi Bill,

        Sorry for your miseries with 850 engines.

        I'm curious what kind of oil you run in them?

        (I think that the 850 engines need synthetic oil.)

        Thanks, Bill



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          posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

          I agree with Bill. Unlike the old red block 4 cylinder (bulletproof beyond belief!), the Volvo 5 cylinder engines require more care. Synthetic will help the engines last longer and keep the PCV system clean. My 95 855 has 249k and is just beginning to use some oil (quart every 2k or so) but I think that is due to having used dino oil in it.

          All along I've used synthetic in my 2002 Passat wagon and it uses almost no oil at 130K.

          Good luck! Hopefully your cylinder isn't dead.


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