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

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circuit slave

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 said:
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
Click to expand...


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.
 
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.
Click to expand...
Bad Lambda sensor/2 Sensor can affect fuel use to.
 
circuit slave said:
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?
Click to expand...
Could it be something more basic like binding brakes or slipping
transmission or clutch?
 
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 said:
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.
Click to expand...
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.
 
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 !
 
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.
 
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