90 model 740GL auto, B230F w/220,000+ miles

Discussion in 'Volvo 740' started by Bruce, May 26, 2008.

  1. Bruce

    Bruce Guest

    Guys,
    I've got a problem with the motor bogging down upon acceleration. If
    you back off the pedal just a little it takes off sometimes and will run up
    to speed and run normal until slowing for traffic. When pulling a hill it
    lugs until it shifts in lower gear and then it usually takes off and will
    get up to speed. If your climbing a real hill (very steep) it just slows to
    a stop chugging all the while. I pulled the distributor and cleaned up the
    cap as it had some oil in it and slightly filed the contacts, reassembled
    and it did seem to help as I was able to drive 150 miles home but it's not
    fixed by any means.
    I would appreciate any and all help with diagnosing this problem.
    Bruce
     
    Bruce, May 26, 2008
    #1
  2. Bruce

    Bill Bradley Guest

    There are a few possibilities that spring to mind:
    When was the timing belt last replaced? This sounds like what happens
    if it hops a tooth, poor low rpm response and picks up dramatically
    around 3500rpm. Spark plugs in need of replacement will also sometimes
    behave this way.
    Another possibility is that your loss of power is the knock sensor
    backing off the timing. That could be caused by an overly lean mixture
    (low fuel pressure from a clogged fuel filter or failing fuel pump).
    Oddly enough you might also be running too rich of a mixture and at
    partial throttle the oxygen sensor is leaning it out, and at full
    throttle enrichment the engine is going far too rich.
    Just as a general rule when diagnosing any problem, check all the
    vacuum lines for cracks, being loose, or popping off
     
    Bill Bradley, May 26, 2008
    #2
  3. Bruce

    James Sweet Guest


    I had a bad fuel pressure regulator cause similar symptoms, found a
    junkyard part for a few bucks and popped it in, been fine ever since.
     
    James Sweet, May 26, 2008
    #3
  4. Bruce

    Bruce Guest

    Bill, I did check the vacuum lines first thing even before cleaning the
    rotor cap and bug. I checked the mileage on this timing belt and it shows
    about 50,000 on it. It sounds like it might be time for new plugs and a fuel
    filter to start with. I'll let ya'll know what I find out after that and
    I'll keep the fuel pressure regulator as the next step James. I do
    appreciate this information and will get the parts tomorrow. Thanks
    again,
    Bruce
     
    Bruce, May 27, 2008
    #4
  5. Bruce

    Bruce Guest

    OK, Bill and James,,,
    It would seem that one of the suggestions was infact the salution as
    a quick drive around the block shows that the problem has been resolved. I
    installed new plugs, air filter and the fuel filter. I'll drive it in to
    work and let you know again how it does.
    Thank you both very much, Bruce
     
    Bruce, May 29, 2008
    #5
  6. Bruce

    Bruce Guest

    Well, I spoke too soon as it ran just great/normal for about 40 to 50
    miles then it began sputtering again and I didn't think I was going to get
    back home this evening. I stopped at an auto parts store and picked up a
    small bottle of injector cleaner/water treatment stuff, put it in the full
    tank and it took right off again. So far, so good! I guess they're not
    getting enough for gasoline these days so they're adding water? Anyway, it
    does seem to be doing much better now.
    Thanks again for your information, Bruce
     
    Bruce, May 30, 2008
    #6
  7. Bruce

    James Sweet Guest



    This has the Bosch fuel system with an air mass meter right? Sometimes
    the AMM fails intermittent at first, also could be oxidized contacts on
    the connector.
     
    James Sweet, May 30, 2008
    #7
  8. Bruce

    Bruce Guest

    No it's the Regina System James

     
    Bruce, May 30, 2008
    #8
  9. Bruce

    Bruce Guest

    I did try an new (used) fuel pressure regulator this morning from a local
    salvage because this thing is still crapping out on me everyone and a while.
    It didn't help. I left it at the shop for a diagnostic to find the problem.
    They said this afternoon that they wouldn't be able to look at it till
    Monday. Anyway, that's my update on the continuing saga.
    Bruce
     
    Bruce, May 31, 2008
    #9
  10. Bruce

    Bruce Guest

    Well the word is "Fuel Pump" is weak Ordered one this evening and will get
    it installed a.s.a.p.
    Bruce
     
    Bruce, Jun 3, 2008
    #10
  11. Bruce

    James Sweet Guest


    Let us know what happens. Usually the pumps either work or they don't,
    anything is possible though.
     
    James Sweet, Jun 3, 2008
    #11
  12. Bruce

    Bruce Guest

    James,
    I got the new fuel pump in last evening and drove it all around town
    today. It didn't miss a beat. I guess the guys at my local independent Volvo
    shop were right on wit their diagnostics. Week fuel pump. I'm just glad
    she's back running good again! Thanks for the input it's always appreciated
    very much.
    Bruce
     
    Bruce, Jun 13, 2008
    #12
  13. Bruce

    Bruce Guest

    Well I spoke too soon on this new fuel pump installation. I had to pull
    it again to re-soder one of the leads cause I didn't do the job right the
    first time.
    ;? ( Bruce
     
    Bruce, Jun 22, 2008
    #13
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