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S40 T5 Misfire No Codes S40-V40 2005

posted by  rehsper on  Tue May 29 06:56 CST 2018
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last visit: Fri Apr 27 13:03 CST 2012
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TL:DR version: Flashing CEL @ high RPM + consistent misfire (lumpy idle). No codes. Question: Is it a coil, fuel system component, or a dying engine? What to check first?

I could use a second car and a buddy happens to have a 2005 S40 T5 AWD 6-speed(!) that he basically just wants to give away. He's owned it since new, always dealer serviced, so it's had a lot of good maintenance done to it but...it's still led a pretty hard life I think. At least the last year hasn't been good to it; it's been sitting for most of that time.

I drove it the other day and was pleasantly surprised at how well it drove until it got warmed up and I took a couple pulls to high RPM. That's when the CEL would flash and it developed a miss. Seemed to get worse the longer the drive went on. CEL did not remain on. Car started normally afterwards but had a consistent miss regardless of RPM while sitting in the driveway.

No OBD codes present. The last time it was serviced there was a misfire code for cyl 3. Which was diagnosed as a faulty coil. It and the spark plugs were replaced.

Lacking codes I'm concerned that it's not just another coil or a faulty injector but could be a dying cylinder. I'm willing to take a chance but I don't have much time and money to throw at this thing right now. What should I check on this warlock before I go to the trouble of buying it?

Thanks a bunch.







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    Resolved S40-V40 2005

    posted by  rehsper on  Wed Jun 20 06:58 CST 2018
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    last visit: Fri Apr 27 13:03 CST 2012
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    Picked up the car on Saturday. Fiddled with it to locate the dead cylinder by removing injector wires (thanks Volvo for making that so easy to do); then drove it home with the #1 injector disconnected. Drove OK over 2K rpm.

    Popped a new coil in it and immediately it cleared up and revved smooth. Hooray!


    Now to move on to the rest of the car. New rear brakes on order, need to figure out what to do about a tire leaking at the bead of a corroded wheel, a damp/chemical smelling interior, sagging headliner, and a new drivers floormat. If I can get all that fingered out then maybe I can dig the audio unit out to extract the CDs stuck in it.

    Excited to be back in a Volvo. Been driving a Honda Odyssey and I'm tired of it.








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    S40 T5 Misfire No Codes S40-V40 2005

    posted by  KlausC on  Wed May 30 09:24 CST 2018
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    last visit: Fri Oct 24 10:15 CST 2014
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    You are right in being worried. I would want to get a compression test w/leak down. Usually, when you have multiple misfires (flashing CEL) codes will be stored. When it is a single coil, a code is stored. In your case, no codes??

    A burned valve is one thing, a cracked sleeve is another. Or it could be a simple fix, like a leaking join in the intercooler piping.
    --
    Keeping it running is better than buying new








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      S40 T5 Misfire No Codes S40-V40 2005

      posted by  rehsper on  Wed May 30 13:18 CST 2018
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      last visit: Fri Apr 27 13:03 CST 2012
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      You know, thinking about it more, I don't think it's poor compression. The car drove fine for the first five minutes. The misfire began only after about five minutes into the drive when I revved it up past 4k rpm (or the engine's temperature came up).

      Sounding (to me anyway) more like a typical Volvo electrical gremlin.

      I should go drive it again; do a little more poking/prodding.







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    S40 T5 Misfire No Codes S40-V40 2005

    uid 5322's pic
    posted by  alschnertz on  Tue May 29 19:42 CST 2018
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    last visit: Fri Oct 24 10:32 CST 2014
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    Your symptoms sound similar to what I experienced in my '01 years ago.
    For me it was one bad of two coils.

    This is not a recommendation to start throwing parts at it, but maybe you can swap coils with someone who has known good ones.

    I have no idea how your engine is different from the 1.9L 4-cylinder in mine, but thought I'd share.








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      S40 T5 Misfire No Codes S40-V40 2005

      posted by  rehsper on  Wed May 30 08:22 CST 2018
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      last visit: Fri Apr 27 13:03 CST 2012
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      Thanks Tom. I want to believe that yeah, it's just a bad coil, but I worry about the other more sinister possibilities or yes, spending lots of time/money throwing parts at the problem.

      I can get a whole set of aftermarket coils for about $100 so it's not a huge investment.

      -Will








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        S40 T5 Misfire No Codes S40-V40 2005

        posted by  Chris Mullet on  Wed May 30 09:25 CST 2018
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        last visit: Fri Oct 24 09:08 CST 2014
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        The first thing I would do is try a set of NGK BKR6ES (standard copper core) plugs for a total financial investment of about $10-12. Steer clear of all the pricey designer plugs.

        If that doesn't work THEN I'd try the coil(s). If you have a self-serve wrecking yard near you it might be a better option to go grab a handful of Volvo OE coils for about $10 each rather than the Chinese stuff sold in the local parts houses. Don't worry about them being used. If you get a couple good ones out of say five, you're still money ahead. I'm still running the original coils in both of our FWD's. The 2.5T has 195,000 miles and the 2.4NA has about 235,000. OK, so I'm lucky, I'll admit. Sometimes I wonder if it isn't the goofy plugs people install that causes some of the coil failures.
        --
        Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)







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