car cutting off

Discussion in 'General Motoring' started by MLJ, May 20, 2005.

  1. MLJ

    MLJ Guest

    To anyone who can help me- I have a '91 740 Turbo. Lately it has bee
    cutting off sporatically when I am turning into a parking space o
    turning out of a parking space. Today it cut off in slow traffic.
    took the car to one Volvo mechanic who said it was the fuel pump relay
    which he replaced. The problem continued. I took it to another Volv
    mechanic that said I needed a tune-up which he did. The problem stil
    continues. When I called him back he now says it might be the fue
    pump. Can anyone tell me if this sounds like a fuel pump problem? I
    there a way where they can look and see if the fuel pump is going bad
    Help!

    ML
     
    MLJ, May 20, 2005
    #1
  2. Fuel pumps don't often become intermittent - they usually stay bad once they
    quit. There are a few common causes of this sort of dying (and the fuel pump
    relay was a good suspect, even if it didn't fix the problem) that the gurus
    here can help you with. I'm thinking about the crank angle sensor myself,
    but don't spend money on my guess ;-)

    A cheap thing to check is the condition of the connections at the positive
    battery terminals. Our '85 765 turbo - somewhat similar to your car - had
    problems with cutting out in left hand turns. It turned out to be the
    connection where the lone wire attached to my positive terminal - apparently
    the stresses of turning left stirred up the bad connection. When you take
    the car back for whatever work the gurus recommend, having the battery
    connections cleaned to ward off evil spirits might be a good thing.

    Mike
     
    Michael Pardee, May 21, 2005
    #2
  3. MLJ

    Bev A. Kupf Guest

    I agree with Mike - I don't think that fuel pumps go bad gradually.
    But the intermittent problem that you have could be the radio suppression
    relay (its also called the fuel injector relay).

    I don't know where it is in a '91 740. It was moved around in the engine
    compartment by model and year.

    Beverly
     
    Bev A. Kupf, May 21, 2005
    #3
  4. I knew the experts would be here soon - thanks, Beverly! Mike F has
    mentioned the relay and an identical one that are beside each other in some
    models, and that they can be simply swapped to determine whether that is the
    problem, but again I don't know about a '91 940T. I can't even find them in
    my '85 765T.

    Mike
     
    Michael Pardee, May 21, 2005
    #4
  5. MLJ

    Bev A. Kupf Guest

    Hi Mike - dead on recollection of what Mike F posted. That would be the
    electric cooling fan relay.
    Your '85 wouldn't have one. The fuel injector circuit was not isolated
    until the '86 models. My understanding is that 7(4|6)0/940 series used
    them from '86 until the last model year of the 940.

    Beverly
     
    Bev A. Kupf, May 22, 2005
    #5
  6. Thanks - at least I can stop looking for mine!

    Mike
     
    Michael Pardee, May 22, 2005
    #6
  7. MLJ

    MLJ Guest

    Thanks to you all! I now feel like I have some knowledge and I a
    prepared when I take the car back in. Thanks again!

    ML
     
    MLJ, May 22, 2005
    #7
  8. MLJ

    Mike F Guest

    Hopefully the tune up you got included a cleaning of the throttle body
    and idle air valve, as these 2 things gunking up is a major cause of
    your stalling problem.

    --
    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
     
    Mike F, May 24, 2005
    #8
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