Air Mass sensor and vacumn actuator/valve

Discussion in 'General Motoring' started by Guest, Jun 22, 2005.

  1. Guest

    Guest Guest

    My Vectra 2.2Dti (2000/x, 60K miles)is poorly. This time the car is
    loosing power.
    Up to approx. 3,000 rpm through the gears it accelerates normally.
    However above 3,000 rpm the power disappears. The 50 to 70 mph
    overtaking power is missing. Attempt to thrash it in 3 or 4th and the
    engine management light comes on, the engine drops into limp home mode.
    Turn the ignition off and restart the engine and all is well again.
    Normally I dont rev the engine over 3000 rpm because that gives about 60
    in third. Best fuel economy (50 mpg) can be found below 3000 rpm.
    However I needed to do a bit of "brisk" overtaking on Saturday. Was a
    bit embarrassed when the power disapered. Some testing on a quiet road
    on Sunday showed that this was repeatable. Not very often I hasten to
    add as 3000 ++ rpm in 4th and 5th is well into "Good Morning Judge" land.
    The dealer had a look at it today. Found error codes that leads him to
    conclude that the air mass sensor (£100 ish + vat) is faulty.
    Any thoughts on this?
    He also says that the vacumn valve for the inlet manifold switchover
    solenoid was very hot (that's the one on the nearside of the engine bay,
    by the battery, nearest the front with a white pipe). Now these are £125
    + vat. Should this be hot? is it energised all the time and therefore
    likely to be hot?
    Thanks
    Dave (more bills!)
     
    Guest, Jun 22, 2005
    #1
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  2. Guest

    me140 Guest

    Air mass meters are a weak spot on these engines but I would do a bit of DIY
    checking before you buy one. This engine relies heavily on vacuum to work
    all the valves on the management system so one split pipe buggers it all up.
    An easy check is to watch the turbo waste gate when someone else starts the
    car up. You will see the arm move over. Grab the arm - don't get burnt - and
    try to push it back to where it came from. If it is nearly solid then vacuum
    is ok . If it moves easily you have a vacuum problem and need to look at all
    the pipes VERY carefully for splits..
    The 2.2 has an extra valve - it is metal instead of plastic like the rest -
    near the brake master cylinder. These give up after a while too.
    If all the above check out you really need a vacuum gauge to check any more.
     
    me140, Jun 22, 2005
    #2
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  3. Guest

    Guest Guest

    Thanks for the reply. The dealer carried out the vacuum tests. The turbo
    waste gate does move when the car is started but is solid when it's
    moved into position. So the vacuum is OK.
    Looks like I've got to get an AMS. I'm waiting for quotes from Autovaux
    and some other geezer on the web (as well as the dealer).
    Dave
     
    Guest, Jun 22, 2005
    #3
  4. Guest

    Guest Guest

    Well to answer my own post.
    Success. Fitting a new air mass sensor fixed the problem.
    The car now has some power above 3000 rpm.
    Dave
     
    Guest, Jun 25, 2005
    #4
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