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  1. Differential Coupling Warranty Enhancement

    4.3 Mechanical
    I want to thank you again for your post with attached warranty notice. For a few months now, we simply couldn't figure out what the "growling" noise was about. We figured out that the sound comes reliably at 40 mph with a rpm of 1500 to 2000. The noise stops as soon as you let off the gas...
  2. minor upsizing tires

    4.3 Exterior
    I've been running 235s with no problem. My understanding is that they are an approved size by Toyota. If you can believe my GPS, the speedo is more accurate with the upsize. I only bought four. Not sure if the spare cover fits the bigger tie.
  3. Surprised at i4 power in mountains

    4.3 General
    Power loss becomes very noticeable at 9,000 feet, where accelerating up an incline is difficult. By 11,000 feet I have to drop into first gear and have a maximum speed of about 30mph. At 12,500, off road (4wd I assume), the car could not make it up a slightly steep incline and we had to turn...
  4. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    Thanks. This is very helpful. It's not just a full throttle problem, as it's the lack of oomph that's causing me to put the pedal to the floor. I imagine that a faulty-but-not-yet-failed sensor is a difficult thing to diagnose. I'm going to see if I can talk to a Toyota tech in Colorado. And...
  5. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    I believe it's going lean, as it seems to be getting no fuel. Is a dyno diagnostic capable of simulating performance at altitude?
  6. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    What I'm thinking is that the ECU is mapped to meet emissions requirements and, probably, maximize mileage, perhaps at the expense of other performance characteristics. But I really don't know. In Guatemala, at first the dealer told me that they could remap the ECU to fix the problem. Then they...
  7. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    Interesting. This would seem to support the notion that there is something wrong with my car, although that author and I may have different perspectives on performance. I see another trip to a dealer in my future. In any event, I'm going to try to track down the officially sanctioned idle...
  8. Surprised at i4 power in mountains

    4.3 General
    Just curious, did you ever solve the altitude problem? I'm on an extended trip with this car in South America and it literally can't go up a hill at 12,000 feet. Frustrating doesn't cover it. There's no way we can swap cars, so it seems that we're stuck with a vehicle that simply can't go where...
  9. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    Thanks for the thoughts. The hills here are a lot steeper than they are in the US. The car does suffer from a complete loss of power, probably at around 12,500 feet. At that altitude it simply can't go up a hill. I will take it to another dealer before we get to altitudes above 11,000 feet...
  10. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    The cars here don't have to meet US or Euro emissions requirements, so they are not optimizing fuel/air ratios for pollution control. We rented a Toyota Camry 4cyl in Peru and took it to 16,000 feet without a problem. On the other hand, they must be driving these cats at above 12,000 feet in...
  11. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    Ahhh autocorrect is killing me. 90hp should get IT over the hill. Simply not giving the CAR any fuel.
  12. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    A little depressing, although it seems that HP loss is only part of the problem. 90HP should get out over the hill. I think that the ECU's response to the atmospheric pressure/lack of oxygen is a larger component. It's simply not giving the care any fuel. I'm going to try to source a freer...
  13. Complete loss of power at 12,000 feet; idle relearn? ECU reprogram?

    4.3 Mechanical
    Hello, My wife and I bought a 2010 RAV4 4WD 4cyl for an extended driving trip (from USA to Chile). In Guatemala, at 12,000 feet altitude, the car suffered such severe power loss that it couldn't go up a hill. Obviously, this is a problem for us as we will be at 16,000 feet at times during our...
  14. RAV4 Custom Coil Spacer Lift

    4.3 Mechanical
    Any word from Colorado Mountain Rally? I emailed them...it's been a couple of days and no response and I don't see a phone number anywhere. Really strange way to run a business. I'm driving my RAV from Washington down to Chile and I'd like a little lift to provide more speed bump protection.
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