Volvo 740 failing to start

Discussion in 'Volvo 740' started by Yvonne and Dan, Nov 30, 2005.

  1. Hi, I'm new to this forum.

    We are living in England and have a petrol Volvo 740 Estate automatic.

    Recently it's been reluctant to start on cold days. Our initial thought was ice in the fuel so we added something to dry out any water in the fuel. The engine was turning over fine but failing to start.

    This week the problem has begun happening when the car is warm as well as cold.

    We were able to drive into town 2 days ago, parked for 10 minutes, then the car failed to start with a warm engine. The breakdown chap said it wasn't an ignition problem as it was turning over fine. However he gave us a boost that did enable the car to start. He said everything pointed to fuel pump relay.

    We later changed the fuel pump relay on Monday as this is apparently a common fault in Volvos. It then began starting intermidently and would start on the second attempt. This morning again it failed to start. Each time we try to start it we hear the in-tank fuel pump doing its thing so I don't think it's that. Incidentally we took the case off the old relay and couldn't see any cracks.

    It feels very much like a problem to do with not enough fuel getting through to initially start the car.

    I have to stress that once we finally get the thing started it runs very nicely and doesn't stall or misfire at all. This must surely rule out lots of common problems.

    Any advice, or anyone had anything similar? We have 6 children (one of whom is a baby) and really rely on the car on a day to day basis for transport.

    Yvonne
     
    Yvonne and Dan, Nov 30, 2005
    #1
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  2. Yvonne and Dan

    Nightmare Guest

    Hi
    I owned a 740 a couple of years ago,and had the same problems.
    In my case it was the relays yep two of them one under the hood and the other in dashboard console and for me it worked fine for some time but I also had to fix the electric
    connections on the mainpump but after all that it worked just fine
    It would not hurt if you check the pump in the gastank too

    I hope this is some help
    Regards
    Nightmare
    "Yvonne and Dan" <> skrev i meddelandet news:Hzdjf.6977$...
    Hi, I'm new to this forum.

    We are living in England and have a petrol Volvo 740 Estate automatic.

    Recently it's been reluctant to start on cold days. Our initial thought was ice in the fuel so we added something to dry out any water in the fuel. The engine was turning over fine but failing to start.

    This week the problem has begun happening when the car is warm as well as cold.

    We were able to drive into town 2 days ago, parked for 10 minutes, then the car failed to start with a warm engine. The breakdown chap said it wasn't an ignition problem as it was turning over fine. However he gave us a boost that did enable the car to start. He said everything pointed to fuel pump relay.

    We later changed the fuel pump relay on Monday as this is apparently a common fault in Volvos. It then began starting intermidently and would start on the second attempt. This morning again it failed to start. Each time we try to start it we hear the in-tank fuel pump doing its thing so I don't think it's that. Incidentally we took the case off the old relay and couldn't see any cracks.

    It feels very much like a problem to do with not enough fuel getting through to initially start the car.

    I have to stress that once we finally get the thing started it runs very nicely and doesn't stall or misfire at all. This must surely rule out lots of common problems.

    Any advice, or anyone had anything similar? We have 6 children (one of whom is a baby) and really rely on the car on a day to day basis for transport.

    Yvonne
     
    Nightmare, Nov 30, 2005
    #2
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  3. "Yvonne and Dan" <> wrote in message
    news:Hzdjf.6977$...
    Hi, I'm new to this forum.

    We are living in England and have a petrol Volvo 740 Estate automatic.

    Recently it's been reluctant to start on cold days. Our initial thought was
    ice in the fuel so we added something to dry out any water in the fuel. The
    engine was turning over fine but failing to start.

    This week the problem has begun happening when the car is warm as well as
    cold.

    We were able to drive into town 2 days ago, parked for 10 minutes, then the
    car failed to start with a warm engine. The breakdown chap said it wasn't an
    ignition problem as it was turning over fine. However he gave us a boost
    that did enable the car to start. He said everything pointed to fuel pump
    relay.

    We later changed the fuel pump relay on Monday as this is apparently a
    common fault in Volvos. It then began starting intermidently and would start
    on the second attempt. This morning again it failed to start. Each time we
    try to start it we hear the in-tank fuel pump doing its thing so I don't
    think it's that. Incidentally we took the case off the old relay and
    couldn't see any cracks.

    It feels very much like a problem to do with not enough fuel getting through
    to initially start the car.

    I have to stress that once we finally get the thing started it runs very
    nicely and doesn't stall or misfire at all. This must surely rule out lots
    of common problems.

    Any advice, or anyone had anything similar? We have 6 children (one of whom
    is a baby) and really rely on the car on a day to day basis for transport.

    Yvonne

    ********************************************************************

    I agree that the original problem has all the characteristics of a bad fuel
    pump relay. Glad you changed it.

    The starting on the second try raises the likelihood that the fuel pressure
    in the injector rail is bleeding off. The usual way to diagnose that (other
    than putting a fuel pressure guage on the rail) is to use a different
    starting technique. Try this: "bump" the starter (crank for a fraction of a
    second), let the key back into the "run" position for a couple seconds, then
    try starting. If it starts reliably that way, the pressure is probably
    bleeding off... usually back through the check valve on the output of the
    main fuel pump under the car beneath the left front seat. Mine has been
    doing that for years and I just use the bump/start method. That's how lazy
    I've become.

    There is a related possibility. One of the fuel injectors may be dripping
    into the intake, which floods one cylinder and causes the others to have the
    symptoms above.

    In either case, a bottle of fuel injector cleaner (as opposed to the fuel
    drying additive) is cheap, easy, and can't hurt. It may fix either problem
    by the time the tank of fuel is used up. If not, you're out a couple of
    pounds.

    I have no idea why it is so hard to start an engine that has lost pressure
    in the fuel rail, but maybe the injection computer gets confused and tries a
    leaner mixture about the time the pressure comes up.

    Mike
     
    Michael Pardee, Dec 1, 2005
    #3
  4. Why not contact the Volvo Owners Club forums for advice on your problem. URL is http://www.volvoclub.org.uk On the index page there is a link on the left hand side for Forums. Click on that and register yourself as a forum user. Then you can access the forums. Technical problems for your car would be under "700 series". Also the Brickboard FAQs are accessible from the VOC site. Same URL, link also on index page. The main problems with 740s are the fuel system & ECU (both pumps, fuel pump relay and radio suppression relay [this actually should be named as injector relay as it is part of the circuit for all the injectors] and the ignition system & ICU ( timing sensor(s), distributor, coil and leads, spark plugs and ignition amplifier [this drives the coil, but sits between the air filter and the left hand inner wing] which usually suffers from corrosion and poor connections, mainly earthing ones.

    It only costs about £25 per year to join the VOC, this can also be done from the VOC site via a link on the index page.

    All the best, Peter.

    700/900/90 Register Keeper,
    Volvo Owners Club (UK).
    "Yvonne and Dan" <> wrote in message news:Hzdjf.6977$...
    Hi, I'm new to this forum.

    We are living in England and have a petrol Volvo 740 Estate automatic.

    Recently it's been reluctant to start on cold days. Our initial thought was ice in the fuel so we added something to dry out any water in the fuel. The engine was turning over fine but failing to start.

    This week the problem has begun happening when the car is warm as well as cold.

    We were able to drive into town 2 days ago, parked for 10 minutes, then the car failed to start with a warm engine. The breakdown chap said it wasn't an ignition problem as it was turning over fine. However he gave us a boost that did enable the car to start. He said everything pointed to fuel pump relay.

    We later changed the fuel pump relay on Monday as this is apparently a common fault in Volvos. It then began starting intermidently and would start on the second attempt. This morning again it failed to start. Each time we try to start it we hear the in-tank fuel pump doing its thing so I don't think it's that. Incidentally we took the case off the old relay and couldn't see any cracks.

    It feels very much like a problem to do with not enough fuel getting through to initially start the car.

    I have to stress that once we finally get the thing started it runs very nicely and doesn't stall or misfire at all. This must surely rule out lots of common problems.

    Any advice, or anyone had anything similar? We have 6 children (one of whom is a baby) and really rely on the car on a day to day basis for transport.

    Yvonne
     
    Peter K L Milnes, Dec 1, 2005
    #4
  5. Thanks very much for your helpful posting, and the other two people who
    posted too.

    The problem turned out being water in the fuel which on cold days had turned
    to ice. The local garage removed a lot of water from the bottom of the tank
    and from the fuel injector rail.

    Having had a couple of cold days where the car has started we're now fairly
    convinced that was the problem.

    Looks like we could do with new spark plugs and distributor cap anyhow.

    Thanks again for your reply to my original.

    Yvonne




    "Michael Pardee" <> wrote in message
    news:...
    > "Yvonne and Dan" <> wrote in message
    > news:Hzdjf.6977$...
    > Hi, I'm new to this forum.
    >
    > We are living in England and have a petrol Volvo 740 Estate automatic.
    >
    > Recently it's been reluctant to start on cold days. Our initial thought

    was
    > ice in the fuel so we added something to dry out any water in the fuel.

    The
    > engine was turning over fine but failing to start.
    >
    > This week the problem has begun happening when the car is warm as well as
    > cold.
    >
    > We were able to drive into town 2 days ago, parked for 10 minutes, then

    the
    > car failed to start with a warm engine. The breakdown chap said it wasn't

    an
    > ignition problem as it was turning over fine. However he gave us a boost
    > that did enable the car to start. He said everything pointed to fuel pump
    > relay.
    >
    > We later changed the fuel pump relay on Monday as this is apparently a
    > common fault in Volvos. It then began starting intermidently and would

    start
    > on the second attempt. This morning again it failed to start. Each time we
    > try to start it we hear the in-tank fuel pump doing its thing so I don't
    > think it's that. Incidentally we took the case off the old relay and
    > couldn't see any cracks.
    >
    > It feels very much like a problem to do with not enough fuel getting

    through
    > to initially start the car.
    >
    > I have to stress that once we finally get the thing started it runs very
    > nicely and doesn't stall or misfire at all. This must surely rule out lots
    > of common problems.
    >
    > Any advice, or anyone had anything similar? We have 6 children (one of

    whom
    > is a baby) and really rely on the car on a day to day basis for transport.
    >
    > Yvonne
    >
    > ********************************************************************
    >
    > I agree that the original problem has all the characteristics of a bad

    fuel
    > pump relay. Glad you changed it.
    >
    > The starting on the second try raises the likelihood that the fuel

    pressure
    > in the injector rail is bleeding off. The usual way to diagnose that

    (other
    > than putting a fuel pressure guage on the rail) is to use a different
    > starting technique. Try this: "bump" the starter (crank for a fraction of

    a
    > second), let the key back into the "run" position for a couple seconds,

    then
    > try starting. If it starts reliably that way, the pressure is probably
    > bleeding off... usually back through the check valve on the output of the
    > main fuel pump under the car beneath the left front seat. Mine has been
    > doing that for years and I just use the bump/start method. That's how lazy
    > I've become.
    >
    > There is a related possibility. One of the fuel injectors may be dripping
    > into the intake, which floods one cylinder and causes the others to have

    the
    > symptoms above.
    >
    > In either case, a bottle of fuel injector cleaner (as opposed to the fuel
    > drying additive) is cheap, easy, and can't hurt. It may fix either problem
    > by the time the tank of fuel is used up. If not, you're out a couple of
    > pounds.
    >
    > I have no idea why it is so hard to start an engine that has lost pressure
    > in the fuel rail, but maybe the injection computer gets confused and tries

    a
    > leaner mixture about the time the pressure comes up.
    >
    > Mike
    >
    >
     
    Yvonne and Dan, Dec 8, 2005
    #5
  6. Yvonne and Dan

    Nightmare Guest

    Aha water in the fuel good it turned out well
    Regards
    Nightmare
    "Yvonne and Dan" <> skrev i meddelandet
    news:Y%Qlf.24458$...
    > Thanks very much for your helpful posting, and the other two people who
    > posted too.
    >
    > The problem turned out being water in the fuel which on cold days had
    > turned
    > to ice. The local garage removed a lot of water from the bottom of the
    > tank
    > and from the fuel injector rail.
    >
    > Having had a couple of cold days where the car has started we're now
    > fairly
    > convinced that was the problem.
    >
    > Looks like we could do with new spark plugs and distributor cap anyhow.
    >
    > Thanks again for your reply to my original.
    >
    > Yvonne
    >
    >
    >
    >
    > "Michael Pardee" <> wrote in message
    > news:...
    >> "Yvonne and Dan" <> wrote in message
    >> news:Hzdjf.6977$...
    >> Hi, I'm new to this forum.
    >>
    >> We are living in England and have a petrol Volvo 740 Estate automatic.
    >>
    >> Recently it's been reluctant to start on cold days. Our initial thought

    > was
    >> ice in the fuel so we added something to dry out any water in the fuel.

    > The
    >> engine was turning over fine but failing to start.
    >>
    >> This week the problem has begun happening when the car is warm as well as
    >> cold.
    >>
    >> We were able to drive into town 2 days ago, parked for 10 minutes, then

    > the
    >> car failed to start with a warm engine. The breakdown chap said it wasn't

    > an
    >> ignition problem as it was turning over fine. However he gave us a boost
    >> that did enable the car to start. He said everything pointed to fuel pump
    >> relay.
    >>
    >> We later changed the fuel pump relay on Monday as this is apparently a
    >> common fault in Volvos. It then began starting intermidently and would

    > start
    >> on the second attempt. This morning again it failed to start. Each time
    >> we
    >> try to start it we hear the in-tank fuel pump doing its thing so I don't
    >> think it's that. Incidentally we took the case off the old relay and
    >> couldn't see any cracks.
    >>
    >> It feels very much like a problem to do with not enough fuel getting

    > through
    >> to initially start the car.
    >>
    >> I have to stress that once we finally get the thing started it runs very
    >> nicely and doesn't stall or misfire at all. This must surely rule out
    >> lots
    >> of common problems.
    >>
    >> Any advice, or anyone had anything similar? We have 6 children (one of

    > whom
    >> is a baby) and really rely on the car on a day to day basis for
    >> transport.
    >>
    >> Yvonne
    >>
    >> ********************************************************************
    >>
    >> I agree that the original problem has all the characteristics of a bad

    > fuel
    >> pump relay. Glad you changed it.
    >>
    >> The starting on the second try raises the likelihood that the fuel

    > pressure
    >> in the injector rail is bleeding off. The usual way to diagnose that

    > (other
    >> than putting a fuel pressure guage on the rail) is to use a different
    >> starting technique. Try this: "bump" the starter (crank for a fraction of

    > a
    >> second), let the key back into the "run" position for a couple seconds,

    > then
    >> try starting. If it starts reliably that way, the pressure is probably
    >> bleeding off... usually back through the check valve on the output of the
    >> main fuel pump under the car beneath the left front seat. Mine has been
    >> doing that for years and I just use the bump/start method. That's how
    >> lazy
    >> I've become.
    >>
    >> There is a related possibility. One of the fuel injectors may be dripping
    >> into the intake, which floods one cylinder and causes the others to have

    > the
    >> symptoms above.
    >>
    >> In either case, a bottle of fuel injector cleaner (as opposed to the fuel
    >> drying additive) is cheap, easy, and can't hurt. It may fix either
    >> problem
    >> by the time the tank of fuel is used up. If not, you're out a couple of
    >> pounds.
    >>
    >> I have no idea why it is so hard to start an engine that has lost
    >> pressure
    >> in the fuel rail, but maybe the injection computer gets confused and
    >> tries

    > a
    >> leaner mixture about the time the pressure comes up.
    >>
    >> Mike
    >>
    >>

    >
    >
     
    Nightmare, Dec 12, 2005
    #6
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