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Help, 550 lack of power?!

Discussion in 'Technical Q&A' started by stephens, Feb 29, 2004.

  1. stephens

    stephens F1 Rookie
    Lifetime Rossa

    Feb 13, 2004
    4,483
    Australia
    Full Name:
    Stephen S
    After re-fueling today, the car is running like it only has half power. It still revs out , is smooth and doesn't feel like it's missing or anything, but has the power of a Toyota Corrolla. Any suggestions?
     
  2. stephens

    stephens F1 Rookie
    Lifetime Rossa

    Feb 13, 2004
    4,483
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    Stephen S
    Update.
    I disconnected the battery, suspecting an electronic glitch. The power is now back, but the "Slow Down" light is flashing all the time.
     
  3. Muta

    Muta Rookie

    Jan 18, 2004
    13

    Didn't that light mean exaust temperatures were too high?

    And didn't someone set their car on fire ignoring it?
     
  4. stephens

    stephens F1 Rookie
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    Feb 13, 2004
    4,483
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    Stephen S
    The warning is flashing from a cold start, so I don't think it is the exhaust.
     
  5. stephens

    stephens F1 Rookie
    Lifetime Rossa

    Feb 13, 2004
    4,483
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    Stephen S
    I did some research on the board. The car was not runing hot at the time, temperature was less than 80 degrees C (176 degrees F), but the power did come back after the car was left for an hour or so, even though the light was still flashing.
    Further update, I just took the car for another run tonight. The light was flashing for quite sometime, even during and after warm up, but after a few "performance" runs, the problem now seems to have cleared completely.
    Could this be due to bad fuel,? I refilled with 90 litres (115 litre capacity) and have now driven around 100kms since refuelling, so I am thinking that there was some bad fuel in the last tank.
     
  6. bobafett

    bobafett F1 Veteran

    Sep 28, 2002
    9,193
    Sounds like either your motronic ECUs or Thermocouplers have gone bad or are faulty. I recently had a similar experience. It was nothing more than technical glitch, but there was an update to these parts in either 99 or 00, and you should make sure that your car has the new ones.

    If it's anything else, I'd be surprised. The updates should be under a warranty, regardless.

    --Dan
     
  7. stephens

    stephens F1 Rookie
    Lifetime Rossa

    Feb 13, 2004
    4,483
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    Stephen S
    Thanks Dan
    Spoke to a tech this morning, he suggested the same. I am taking it in tomoorw morning to have it checked out.
     
  8. bobafett

    bobafett F1 Veteran

    Sep 28, 2002
    9,193
    Let me know the outcome. See if you can get detailed information.

    --Dan
     
  9. stephens

    stephens F1 Rookie
    Lifetime Rossa

    Feb 13, 2004
    4,483
    Australia
    Full Name:
    Stephen S
    The left hand bank O2 sensor was faulty, tried cleaning, but it was too far gone. The left exhaust was reading 200ppm hydrocarbons compared to 45 on the right bank. It's running like a charm now.
     

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