2012 S60 T5 Cylinder 1 Low Compression
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    1. #1
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      2012 S60 T5 Cylinder 1 Low Compression

      Hey folks,

      I was on the way to get an LOF and my check engine light flashed 3 times then went off. The car (2012 S60 T5...128K miles) immediately had a rough idle. When I arrived at the shop, they determined that the cylinder 1 ignition coil was bad. After replacing that and a new set of plugs the car was still idling rough. They did a compression test and cylinder 1 had 50lbs of compression...the other 5 cylinder had between 150 - 180lbs of compression. The scanner had the following codes:

      P030092---Random misfire
      P030192---Cylinder 1 misfire
      P030298---Cylinder 2 misfire

      The shop is your basic retail service chain that does the basics well, not the kind of work that this may require. I am having it towed to a shop that specializes in Volvos. Does it sound like cylinder 1 is definitely bad? Do shops replace just the cyinder or will they jump to replacing the engine?

      Thank you in advance

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    3. #2
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      Yes, the compression numbers indicate a big problem in Cyl. #1.

      The Volvo dealer can figure it out. Bad rings, stuck valve or a holed piston in that cylinder are typical suspects unless it's just a loose spark plug, which is unlikely right after replacing them.

      Good of you to describe the issue from the start. The story sounds a lot like what happened to this owner with the same car/motor, also with mileage similar to yours:

      LINK: https://forums.swedespeed.com/showthread.php?589463

      Bad rings, valve or piston all call for a partial or complete teardown of the engine regardless of how many cylinders are involved. Or perhaps a replacement engine. Sorry.
      Last edited by Captain Tom; 12-02-2019 at 04:37 PM.
      2012 S60 T5

    4. #3
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      Modern engines are not good things to have to work on if you're paying someone else. By the time you tear them down to determine the fix it's often just as far ahead to assume the worst and replace the motor. Otherwise you're paying for tear down diag that might lead to the same solution or tear down and then a costly repair that is close to cost of replacing the motor. If I were to guess I'd say the rings because they will still hold some compression when they go bad.

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    6. #4
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      It's not a loose spark plug. The plug is removed to install the compression gauge. A cylinder leakage test needs to be done, but there won't be a cheap solution to this.

    7. #5
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      Quote Originally Posted by Tech View Post
      It's not a loose spark plug.
      Absolutely right! My goof-up on that one.
      2012 S60 T5

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