Engine & Gearbox Accord with Altitude Sickness?

Discussion in '7th Generation (2003-2008) [Acura TSX]' started by Tasa, Sunday 19th Oct, 2014.

  1. Tasa Junior Member ☆ ☆ ☆ ☆ ☆

    I have Honda Accord (2006 UK model), and it runs perfectly as long as it is driving below 700m (above sea level). I live in London, and like to take long road trips through Europe. Hover, I am faced with a really strange problem: When my car gets over 700m it is starts to behave really, really strange. Every time I would start from a stationary position, or if I would to shift down whilst in motion, the car completely loses power. I cannot get it to go over 1500RPM (or so), it bellows thick dark smoke from the exhaust, and picking up speed becomes almost impossible challenge.

    I was able to find a "hack" to make this a bit more bearable. I would have to get the car moving then very quickly release accelerator pedal, then press it hard again when I feel the car slowing down. After few of these "pumping" actions, the car would start to drive more or less normally, as long as I do not shift down.

    I have tried to take the car to the garage, but it came out clean. Some garages came out with different theories, but they felt more like expensive guesses. As you would appreciate this is not something I can easily replicate. There are only four roads higher than 700m in Britain, and all are in Pennines or Scotland. Any ideas anyone?
  2. hondream Valued Contributor ★ ★ ★ ☆ ☆

    Simon Walsall
    Just my theory, and I'm probably wrong.....

    But isn't the oxygen a lot less at higher altitudes......
    Possibly oxygen sensor?
  3. Nels Moderator Staff Team

    Petrol or diesel Accord @ Tasa?
  4. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
    It's going to relate to oxygen in some way, I doubt the barometric pressure from higher altitudes would make any difference to engine performance.

    Do you have a clean air filter, throttle body etc.? If it's a diesel, also the EGR?
  5. Tasa Junior Member ☆ ☆ ☆ ☆ ☆

    @Nels: It's Diesel.
    - - - Updated - - -
    @DeviateDefiant: Air filter has been replaced few times (as part of a regular service). I am not sure what throttle body and EGR are...
  6. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
    EGR is a valve that recycles the engine exhaust for another pass through the engine before dumping it, it gets pretty clogged up with carbon over the years. We have a couple of guides on the site for cleaning them, what year is your Accord?

    The throttle body sits before your intake manifold and after the airbox, it has a plate in it which opens when you put your foot on the accelerator pedal, that's where the engine's oxygen supply comes from. Again, this can become clogged up over time.

    By the way, if you add your car to the club garage, we can all see your car below your posts and it helps diagnose issues :Smile:
  7. Ichiban Founder Staff Team

    England CJ Leeds
    Sounds like the typical fuel starvation on the I-CTDI, change the fuel filter with a genuine Honda filter only. First do that, then review it.