Volvo 940 TD Auto - Turbo Probs

Discussion in 'Volvo 940' started by Guest, Oct 27, 2003.

  1. Guest

    Guest Guest

    Hi, well here goes, I got a 940 TD auto and love this car 2 bits, however
    when I boot or accelerate sharply, the turbo light comes on and get a
    sooking noise (louder than usual). Runs like a dream other than that. I
    think its a 1992 / 1994 model. Anyone any suggestions ?

    Davie

     
    Guest, Oct 27, 2003
    #1
  2. Guest

    James Sweet Guest

    I'm not very familiar with the diesel turbos, but it sounds like your boost
    is going too high, you should look at the wastegate and whatever controls it
    in that car, is it a simple pneumatic solenoid, or does it have electronic
    control?
     
    James Sweet, Oct 27, 2003
    #2
  3. Guest

    blurp Guest

    Left unresolved this will quickly toast your turbo as it did mine.

    Also from my experience, if the mecahnic says, "That just happens
    sometimes. Sometimes the Turbo runs into the red and the turbo light
    comes on" then he's an idiot and a liar and you shouldn't trust him

    Been there, paid that.

    blurp.
     
    blurp, Oct 27, 2003
    #3
  4. Guest

    Mike F Guest

    Well, actually on a 240 Turbo that originally wasn't intercooled had a
    gauge with a red section that the needle would go into when the
    intercooler kit was installed. This would also turn the light on, part
    of the intercooler kit installation was removing the turbo warning light
    on the dash.
     
    Mike F, Oct 28, 2003
    #4
  5. Guest

    James Sweet Guest


    Yeah but that's different, that's a modification that allows you to run
    higher boost. The factory intercooled models had a different boost guage
    with a larger yellow section and no connection for the warning light. Of
    course even with that guage mine goes into the red :)

    Still it's different with a gasoline engine than a diesel, turning up the
    boost on a gas (petrol) engine gives more power provided the fuel system can
    keep up, on a diesel you have to turn up the fuel to match whatever boost
    you're running.
     
    James Sweet, Oct 28, 2003
    #5
  6. Guest

    Peter Milnes Guest

    Speaking of 940 Turbodiesels there is only one reason why the light comes on.
    There is no gauge so the guy cannot truthfully say that the turbo runs into the
    red. So the problem is that the engine is tricked into either overboost or into
    thinking that an overboost condition has been achieved. If there is no EGR, then
    there is just one overboost switch which operates if there is excessive manifold
    pressure to put the light on. If the wastegate operating arm is sticking in the
    closed position then overboost can be readily achieved. So check the small pipe
    from the turbo output to the small pressure actuator. It may be split or
    punctured or even missing, or the actuator may well have seized.

    Cheers, Peter.

    : blurp wrote:
    : >
    : > Left unresolved this will quickly toast your turbo as it did mine.
    : >
    : > Also from my experience, if the mecahnic says, "That just happens
    : > sometimes. Sometimes the Turbo runs into the red and the turbo light
    : > comes on" then he's an idiot and a liar and you shouldn't trust him
    : >
    : > Been there, paid that.
    : >
    : > blurp.
    : >
    :
    : Well, actually on a 240 Turbo that originally wasn't intercooled had a
    : gauge with a red section that the needle would go into when the
    : intercooler kit was installed. This would also turn the light on, part
    : of the intercooler kit installation was removing the turbo warning light
    : on the dash.
    :
    : --
    : Mike F.
    : Thornhill (near Toronto), Ont.
    :
    : Change cant to ca and remove parentheses to email me directly.
     
    Peter Milnes, Oct 29, 2003
    #6
  7. Guest

    Mike F Guest

    I was speaking specifically to blurp, who I know from past posts has a
    240 Turbo that my statements would apply directly to. He's had some
    problems with his mechanic who he feels has mislead him, so I was just
    pointing out that maybe he's not being mislead with this overboost
    statement.

    None of this applies to a Volvo turbo diesel.
     
    Mike F, Oct 29, 2003
    #7
  8. Guest

    Peter Milnes Guest

    Don't worry Mike, I wasn't referring to your message to blurp. I was answering
    the first poster as he said it was about a 940 TD. Having got one myself, and
    what a very good machine it is too, I thought I could throw some light on his
    problem. I should have made it clearer and for that I am sorry.

    Cheers, Peter.

    : James Sweet wrote:
    : >
    : > > >
    : > >
    : > > Well, actually on a 240 Turbo that originally wasn't intercooled had a
    : > > gauge with a red section that the needle would go into when the
    : > > intercooler kit was installed. This would also turn the light on, part
    : > > of the intercooler kit installation was removing the turbo warning light
    : > > on the dash.
    : > >
    : > > --
    : >
    : > Yeah but that's different, that's a modification that allows you to run
    : > higher boost. The factory intercooled models had a different boost guage
    : > with a larger yellow section and no connection for the warning light. Of
    : > course even with that guage mine goes into the red :)
    : >
    : > Still it's different with a gasoline engine than a diesel, turning up the
    : > boost on a gas (petrol) engine gives more power provided the fuel system can
    : > keep up, on a diesel you have to turn up the fuel to match whatever boost
    : > you're running.
    :
    : I was speaking specifically to blurp, who I know from past posts has a
    : 240 Turbo that my statements would apply directly to. He's had some
    : problems with his mechanic who he feels has mislead him, so I was just
    : pointing out that maybe he's not being mislead with this overboost
    : statement.
    :
    : None of this applies to a Volvo turbo diesel.
    :
    : --
    : Mike F.
    : Thornhill (near Toronto), Ont.
    :
    : Change cant to ca and remove parentheses to email me directly.
     
    Peter Milnes, Oct 30, 2003
    #8
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.