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  1. #1
    Join Date
    Jul 2017
    Location
    Normal, IL
    Posts
    7

    Exclamation sluggish acceleration (feels like there are 3 AC condensers pulling on engine)

    2004 - XC70 - 225,000 miles - has newer fuel pump - after the car has warmed up it feels like there is something weighing the engine down as if there are extra AC condensers turned on. there is a barely noticeable vibration on the throttle pedal that accompanies this behavior. car is throwing no codes. fuel pump, alternator, and ac condenser all ok. shifting fine. it had been throwing a catalytic converter code 6 months back, I thought it was maybe a clogged CC, but again no codes currently. maybe the MAF sensor??? it is possible that the sparks plugs need to be swapped out??? looking for an assist, this one has me stumped.

  2. #2
    Join Date
    Feb 2010
    Location
    Virginia Beach
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    4,116

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    Bad MAF rarely throws codes and it would be my first guess...but since we're guessing, I would work cheap to expensive and stop when. The problem goes away. So, start with new plugs.

    Then clean the ETM.

    Then try a MAF. Get a Bosch off Amazon. Volvo wants some crazy price.

    A bad MAF can cause exactly what you describe. It's drive by wire, so the throttle won't open more than the computer thinks it needs to and the injectors won't put in more fuel than the MAF measurement determines.

    But that's a guess...and I hate guessing...
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (126K, Michelin AS4, HPL 0W40)
    2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
    2004 V70R (143K, six speed M66, HPL 5W40)
    2004 XC90 (235K, HPL 0W30 Euro)
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  3. #3
    Join Date
    Jul 2017
    Location
    Normal, IL
    Posts
    7

    Default

    thanks for the advice. the ETM was thoroughly cleaned 1 year ago. I will get some new spark plugs,,, and MAF if necessary.

  4. #4
    Join Date
    Jul 2017
    Location
    Normal, IL
    Posts
    7

    Default

    update: replaced the MAF this weekend. just like with the spark plug replacement, there was a little improvement, but still getting some drag. still throwing no codes. I have noticed that the "drag" and very slight vibration occurs once I get beyond 35mph. I am thinking maybe its time to do the PCV next. Also wondering if this behavior has anything to do with the turbo.

  5. #5
    Join Date
    Apr 2003
    Location
    Devon PA
    Posts
    11,409

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    You could have a bad/failing coil that is just starting to go bad under a load and when it gets hot
    All emails please use: jrl1194 (at) aol.com

    2007 V70 2.5T White/Oak, 112K miles. My daily driver and GORGEOUS
    2000 V70R wife's. Won't sell, now at 148K miles !! and still (almost) perfect.
    2000 S70 GLT SE with 29,000 miles!!! A time capsule, V70R front bumper, Volans, etc. SOLD!!! (I Will regret selling this!)

  6. #6
    Join Date
    Jul 2017
    Location
    Normal, IL
    Posts
    7

    Default

    Would the coil start to fail and no codes thrown?

  7. #7
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    4,116

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    Quote Originally Posted by mikeymike54321 View Post
    Would the coil start to fail and no codes thrown?
    Maybe. A coil failure generally (not always) manifests itself under load as a miss, which sets a code.

    But you could have a misfire from a failing coil that the ECM didn't recognize. In which case, no code.

    How long have you owned the car?

    When I get a used car, I "baseline" it: all new filters, fluids, belts and spark plugs. I can see tires and brakes, so they get replaced when needed, but the fluids, filters and plugs are usually of unknown age, so it's easier to replace all that and know where I am starting from...back in the day, I would've included cap, rotor, and plug wires, but those parts don't exist on anything I've bought lately, so, I don't include them any more...
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (126K, Michelin AS4, HPL 0W40)
    2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
    2004 V70R (143K, six speed M66, HPL 5W40)
    2004 XC90 (235K, HPL 0W30 Euro)
    2002 V70-XC (295K, HPL 0W30 Euro)
    2002 V70-T5 (225K, IPD bars, Bilsteins)
    2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  8. #8
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    4,116

    Default

    There is no mechanical connection between your foot and the throttle. So, if it feels sluggish, there are three possibilities, in order of likelihood:

    1. The engine is running poorly
    2. The ETM is dirty and or failing
    3. The pedal transducer is failing to accurately send your pedal position.

    You've addressed 1. Time to address 2. Remove and clean your ETM.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (126K, Michelin AS4, HPL 0W40)
    2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
    2004 V70R (143K, six speed M66, HPL 5W40)
    2004 XC90 (235K, HPL 0W30 Euro)
    2002 V70-XC (295K, HPL 0W30 Euro)
    2002 V70-T5 (225K, IPD bars, Bilsteins)
    2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  9. #9
    Join Date
    Jul 2017
    Location
    Normal, IL
    Posts
    7

    Default

    I cleaned that ETM exactly one year ago. It had given me a lot of grief (weirdly) just in the month of September only, for the past 3 years. Grief in the form of the car going into safe/limp mode, and throwing code for the ETM. I think I will just put a new ETM in at this point. With 227k on it, and its history, its worth replacing. Thanks again for the help.

  10. #10
    Join Date
    Apr 2016
    Location
    USA
    Posts
    56

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    Quote Originally Posted by JRL View Post
    You could have a bad/failing coil that is just starting to go bad under a load and when it gets hot
    How would he test that?

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