Volvo 1987 740 Turbo Gas Hog !!!!!!

Discussion in 'Volvo 740' started by circuit slave, Feb 9, 2006.

  1. I get like 10 miles to the gallon it seems! It wasn't like this a
    couple years ago. I don't really smell fumes and I don't use the turbo
    that often. And you know how, they say you usually get more mpg
    highway than in the city? Well, it seems as if I get better mileage if
    I don't take the freeway. I can practically watch the fuel guage go
    down as I drive across town.

    Can someone recommend best way to increase mileage? The car was
    recently smogged and it idles fine I guess, no misfire or hesitation
    really. Fuel filter maybe?

    thanks
     
    circuit slave, Feb 9, 2006
    #1
  2. circuit slave

    James Sweet Guest


    Air hoses between the turbo and intake manifold are the usual cause of
    excessive fuel consumption. Bad air mass meter can do it, or you might
    have a fuel leak somewhere too. Fuel filter won't increase consumption,
    if it gets clogged it just won't run right.
     
    James Sweet, Feb 9, 2006
    #2
  3. Bad Lambda sensor/2 Sensor can affect fuel use to.
     
    NeedforSwede2, Feb 9, 2006
    #3
  4. circuit slave

    jg Guest

    Could it be something more basic like binding brakes or slipping
    transmission or clutch?
     
    jg, Feb 10, 2006
    #4
  5. Thanks all for the replies. I will look into it!
     
    circuit slave, Feb 10, 2006
    #5
  6. Well, I did change the rear brakes a month ago. But I believe it has
    been like this even before I changed the brakes. That's something to
    look at too, I guess. thanks.
     
    circuit slave, Feb 10, 2006
    #6
  7. circuit slave

    jg Guest

    I had a frozen master cylinder once, when the fluid (and air from slack
    bleeding) got hot it put the brakes on. Easy to check - just see if it rolls
    on its own, but try it when brakes are warm.
     
    jg, Feb 10, 2006
    #7
  8. Update ! Yay ! No more gas hog ! Turns out the TPS Switch on the
    intake was waaay off and so I pulled the whole thing off the car,
    (throttle body and switch) and cleaned it thoroughly and reset the TPS
    to "click". Now it runs with acceleration zip and I have great
    mileage! It really pays to clean all that gunk out of the throttle
    body.


    thanks again for all the suggestions !
     
    circuit slave, Feb 12, 2006
    #8
  9. circuit slave

    Bill Guest

    Sounds like a vacuum hose is loose. I had the problem with an old 240
    and it was blowing gas out the tailpipe, smoking and getting terrible
    mileage. There was a vacuum hose that had come off and I put it back
    on and that fixed it. Look around the top of the engine for it.
     
    Bill, Oct 27, 2006
    #9
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