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  1. Can you pin down which wheel is the pinger? ...

    Can you pin down which wheel is the pinger? When you're expecting the ping near the bottom of a hill, apply the handbrake concurrent with the brakes. If the ping is attenuated, that suggests it's...
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    Some automotive engineers have been influenced by...

    Some automotive engineers have been influenced by spent oil analysis reports to elongate the oil change interval. But, it's prevention of sludge buildup in the PCV system that's the factor to be...
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    A large spark when connecting the battery...

    A large spark when connecting the battery indicates an abnormal load is draining the battery. It should be the tiniest spark (powering the clock, the door fob receiver, and the anti-theft module). ...
  4. You would add a tranny fluid filter inline on the...

    You would add a tranny fluid filter inline on the return path from the radiator (upper connector) to the tranny. It's modular.
  5. Problem resolution: I guessed that the "stutter"...

    Problem resolution:
    I guessed that the "stutter" above 50 mph was unreported misfires. I replaced plugs and coils, air filter, and cleaned throttle body. The stutter is gone.

    Lesson 1: not...
  6. The TPS (according to Bosch's article cited) has...

    The TPS (according to Bosch's article cited) has two redundant potentiometers, so that a CEL is thrown at the first instance of the two not agreeing. But, the 2 potentiometers share mechanical...
  7. Here are a series of two articles explaining...

    Here are a series of two articles explaining Bosch's Motronic Engine Management System concept:

    http://www.autospeed.com/cms/article.html?&title=The-Bosch-MEMotronic-System-Part-1&A=108379
    ...
  8. Could this be hysteresis in the throttle-body? ...

    Could this be hysteresis in the throttle-body? My understanding is that the throttle plate is driven by a servo-controlled-motor. Let's say during high acceleration, the computer is telling the...
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    If you've asked the Volvo Dealer for your copy of...

    If you've asked the Volvo Dealer for your copy of the CPO Inspection Report, and they refuse to produce one, my sense is that is your only legal grounds to have the sale reversed. If you read my...
  10. Throttle "kick" during accelerations over 50 mph

    This is a 2004 XC70 2.5T with 120K miles, well-maintained. B5254 T2 engine for CA cars.

    About a week ago, out on the freeway, I noticed a recurring "lurch forward" during times when over 60 mph...
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    Wrong thread. This topic is about the rear axle...

    Wrong thread. This topic is about the rear axle differential, not the Haldex AWD unit. These are two separate boxes with two separate jobs:
    Haldex: AWD automated clutch. Decides how much torque...
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    Don't do that....you'll overfill it by +350 ml,...

    Don't do that....you'll overfill it by +350 ml, and it will leak gear oil thru the vent. Best approach is to measure volume of what you extract, and replace the same volume (assuming there is no...
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    Is the fuel trim running lean? Is the idle...

    Is the fuel trim running lean? Is the idle choppy, but the engine smooth at higher RPMs? If so, it's likely getting unmetered air. Smoking the EVAP system is good, but you also want to check the...
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    One of the requirements of this AWD car is front...

    One of the requirements of this AWD car is front and rear tires being the same circumference.

    The "grunting noise from the rear while turning left or right" suggests a problem with the rear axle...
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    One experiment you could try is to compare...

    One experiment you could try is to compare acceleration manually using the gas pedal vs. automated acceleration using cruise control (specifically, the "resume" feature). If the jerk plagues both...
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    The software engineers who designed the...

    The software engineers who designed the Aisin/Volvo TCM put a counter inside it which counts the number of fluid overheating incidents. When the fluid is replaced, the counter is supposed to be...
  17. Are you seeing any symptoms from the actual...

    Are you seeing any symptoms from the actual running of the engine? Idle at 650 RPM? Choppiness??
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    If you are not pulling a trailer, or doing...

    If you are not pulling a trailer, or doing mountain driving, the tranny fluid should perform well for 60-75K miles (100-130K km).

    If the tranny is subjected to heavy load, every 30K miles (50K...
  19. So, the weird noise only happens when the AC is...

    So, the weird noise only happens when the AC is ON?? If so, that's your major clue.

    Quoting from the following website:
    "Hissing Noise- One of the more common weird sounds that drivers may here...
  20. Every used Volvo owner needs to invest minimally...

    Every used Volvo owner needs to invest minimally in a Volvo-specific OBD-II scan tool. iCarsoft makes one that costs about $120. The VIDA / Dice scan tool and software gives many more functions,...
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    Under normal driving, the Haldex delivers about...

    Under normal driving, the Haldex delivers about 10% of torque to rear wheels. That means it's engaged hydro-mechanically all the time, with the % torque delivered to rear wheels varying from 10-50%....
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    Pulling the control cable off the Haldex?....or...

    Pulling the control cable off the Haldex?....or cutting the 12V power to it? I've never heard of anyone doing this. It's a mechanical-hydraulic transmission, which relies on pressurized hydraulic...
  23. I bought a 2015 XC70 Seashell Metallic T6 a...

    I bought a 2015 XC70 Seashell Metallic T6 a couple of weeks ago. 27K miles, clear windshield, brand-new condition, paid 26.5. Had to go all the way across USA to buy this car, then drive it home...
  24. I got to the siren module. The wheel arch front...

    I got to the siren module. The wheel arch front rivets have to come out, but my experience is that you can pry them out and reuse them....I used a nail puller tool to extract them. You can leave...
  25. I believe the photos attached to this posting...

    I believe the photos attached to this posting make clear where the Anti-Theft Alarm Module is located:...
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