1992 Volvo 940

Discussion in 'Volvo 940' started by Kim Slyns, Jan 5, 2010.

  1. Kim Slyns

    Kim Slyns Guest

    Help!! I'm tearing my hair out to find the reason for my 940 stalling in
    very hot weather.It happens every summer when the temp gets around 40c. I
    assume its's caused by vapour locks. If you open the bonnet and let it cool
    for 15 mins it runs ok for a few kms before it happens again.
    All other times it runs perfectly. I have "googled " this problem with no
    real concrete answers. I can only think of getting the fuel pumps replaced
    to possibly cure this problem, but I would hate to go to that expense and
    not getting a fix.
    All ideas welcome!!!!
    Kim Slyns, Jan 5, 2010
  2. Kim Slyns

    Leftie Guest

    I seem to recall something about ignition power stages (think
    ignition coil, but different construction) failing from heat. Hopefully
    someone will confirm this.
    Leftie, Jan 5, 2010
  3. The Ignition Amplifier is located between the air filter box and the inner
    wing skin. It usually has problems caused by it's earthing as it is mounted
    on a "heat-sink". Cleaning the connector and also the heat sink will often
    cure this problem. The amplifier is driven from the ICU and bumps up the
    power to drive the coil.
    All the best, Peter.
    Peter K L Milnes, Jan 6, 2010
  4. Kim Slyns

    James Sweet Guest

    The ignition amplifier is the electronic module that takes the logic
    level signal from the ignition computer and switches power to the
    ignition coil. When they fail, they do usually cause occasional stalling
    at first. A way to tell is that the tach needle will fall like a rock
    when the engine stalls.
    James Sweet, Jan 6, 2010
  5. If the in tank pump fails the engine gets little fuel and if the tank is
    low your in trouble happened in my wifes car
    Jon Robertson, Jan 7, 2010
  6. Kim Slyns

    Kim Slyns Guest

    Thanks to all for your help. The problem is still "work in progress" but at
    least I have some clues to go by.
    Kim Slyns, Jan 20, 2010
  7. yea...i think you have two fuel pumps...on in the tank and
    one under the drivers seat...acessed from crawling under the
    car...i used to have to tap mine every once and a while to
    bump it a bit into running ok...this, the one under the drivers
    seat...i think we could tell it was not right by pulling a fuel line
    and seeing if gas was getting pumped at the right pressure....

    good luck...
    ~^ beancounter ~^, Jan 21, 2010
  8. Kim Slyns

    James Sweet Guest

    You can pull the return line from the pressure regulator and verify that
    you have a good flow. I had a pump fail once in a way that it sounded
    like it was running but it wasn't pumping any fuel. The little nubs on
    the motor armature had broken off so the pump mechanism wasn't turning.
    James Sweet, Jan 21, 2010
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