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Volvo 740 Turbo, Gas Use and speedometer

  
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flop580




Joined: Feb 18, 2007
Posts: 1



(Msg. 1) Posted: Sun Feb 18, 2007 11:26 am
Post subject: Volvo 740 Turbo, Gas Use and speedometer
I have a 1990 Volvo 740 Turbo sedan that's had a lot done in the past couple of months. The brakes have been redone, most of the exhaust system has been replaced and it's currently having the water pump replaced and the coolant system is being patched for leaks. My other problems however are gas use and the speedometer. The car manual says that it should get somewhere near 22mpg and I figured during the winter it wouldn't be as good but recently it's really been downing fuel. With the turbo only taking premium gas and fuel prices being where they are this has really become an annoying problem. Anyways I was wondering if anyone has any suggestions of where to look to try and get some better mileage. The other problem is the speedometer. It's been broken since I bought the car about a year ago. I did ask someone's opinion on it, the person who did the brakes actually. He said that it isn't the actual speedometer thats broken because the odometer doesn't work either. He thought that the speed sensor was probably what needed replaced but regardless I figured I would get some other opinions if anyone has any. Thanks for any advice you can give.

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michaeltnull

External


Since: Oct 30, 2004
Posts: 1802



(Msg. 2) Posted: Mon Feb 19, 2007 3:38 pm
Post subject: Re: Volvo 740 Turbo, Gas Use and speedometer [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"flop580" wrote in message

>I have a 1990 Volvo 740 Turbo sedan that's had a lot done in the past
> couple of months. The brakes have been redone, most of the exhaust
> system has been replaced and it's currently having the water pump
> replaced and the coolant system is being patched for leaks. My other
> problems however are gas use and the speedometer. The car manual says
> that it should get somewhere near 22mpg and I figured during the
> winter it wouldn't be as good but recently it's really been downing
> fuel. With the turbo only taking premium gas and fuel prices being
> where they are this has really become an annoying problem. Anyways I
> was wondering if anyone has any suggestions of where to look to try
> and get some better mileage. The other problem is the speedometer.
> It's been broken since I bought the car about a year ago. I did ask
> someone's opinion on it, the person who did the brakes actually. He
> said that it isn't the actual speedometer thats broken because the
> odometer doesn't work either. He thought that the speed sensor was
> probably what needed replaced but regardless I figured I would get
> some other opinions if anyone has any. Thanks for any advice you can
> give.
>
>

Not terribly likely but simple to check - does the temperature guage stay
near mid-range once it warms up? If it is significantly low or wanders a
lot, a new thermostat (genuine Volvo is definitely the way to go) could make
a real difference in fuel efficiency.

Mike

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James Sweet

External


Since: Oct 20, 2005
Posts: 488



(Msg. 3) Posted: Tue Feb 20, 2007 3:55 am
Post subject: Re: Volvo 740 Turbo, Gas Use and speedometer [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
flop580 wrote:
> I have a 1990 Volvo 740 Turbo sedan that’s had a lot done in the past
> couple of months. The brakes have been redone, most of the exhaust
> system has been replaced and it’s currently having the water pump
> replaced and the coolant system is being patched for leaks. My other
> problems however are gas use and the speedometer. The car manual says
> that it should get somewhere near 22mpg and I figured during the
> winter it wouldn’t be as good but recently it’s really been downing
> fuel. With the turbo only taking premium gas and fuel prices being
> where they are this has really become an annoying problem. Anyways I
> was wondering if anyone has any suggestions of where to look to try
> and get some better mileage. The other problem is the speedometer.
> It’s been broken since I bought the car about a year ago. I did ask
> someone’s opinion on it, the person who did the brakes actually. He
> said that it isn’t the actual speedometer thats broken because the
> odometer doesn’t work either. He thought that the speed sensor was
> probably what needed replaced but regardless I figured I would get
> some other opinions if anyone has any. Thanks for any advice you can
> give.
>


You can run standard 87 octane fuel, the ignition sensor will retard the
timing automatically and you'll get slightly lower power and fuel
economy. It won't damage anything though. 22 mpg sounds about right if
the car has an automatic.

I've never even heard of a speed sensor failing in these cars, it's
nothing but a coil encapsulated in epoxy. I have seen the wiring from it
crumble though, and the speedometer and odometer can in fact both fail
at the same time due to solder joints on the circuit board but I would
check the wiring under the car first.
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Jamie

External


Since: Mar 03, 2006
Posts: 183



(Msg. 4) Posted: Tue Feb 20, 2007 1:51 pm
Post subject: Re: Volvo 740 Turbo, Gas Use and speedometer [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I found out my Speedo's problem was in the dash unit because
everything worked but the speed. Sometimes it kicks in by itself.

What I did on my 1987 740 was jack the rear up, unbolt the bar in
front of the speed sensor and then unclip the sensor connector. I cut
the connector off, leaving a couple inches of wire to re-connect.

>From there I dug out each wire from the housing, took a butt-
connector, like 10-12 gauge and attached one to each wire. I then
inserted the wires with the butt connector into each hole of the
housing and re-clipped it on. This rebuilt the connector.

If it sounds confusing, when you unclip the connector to the speed
sensor, you see it is a housing with 2 female connections that clip
onto 2 male connectors. The wire butt connectors, installed over the
wire and placed in the housing act just like what was there before - a
way to clip the wires on.

G'luck!

On Feb 19, 12:28 pm, flop580 wrote:
> I have a 1990 Volvo 740 Turbo sedan that's had a lot done in the past
> couple of months. The brakes have been redone, most of the exhaust
> system has been replaced and it's currently having the water pump
> replaced and the coolant system is being patched for leaks. My other
> problems however are gas use and the speedometer. The car manual says
> that it should get somewhere near 22mpg and I figured during the
> winter it wouldn't be as good but recently it's really been downing
> fuel. With the turbo only taking premium gas and fuel prices being
> where they are this has really become an annoying problem. Anyways I
> was wondering if anyone has any suggestions of where to look to try
> and get some better mileage. The other problem is the speedometer.
> It's been broken since I bought the car about a year ago. I did ask
> someone's opinion on it, the person who did the brakes actually. He
> said that it isn't the actual speedometer thats broken because the
> odometer doesn't work either. He thought that the speed sensor was
> probably what needed replaced but regardless I figured I would get
> some other opinions if anyone has any. Thanks for any advice you can
> give.
>
> --
> Posted at author's request, usinghttp://www.AutoBoardz.cominterface
> Articles individually verified to usenet standards. Visit URL to contact author/report abuse
> Thread archive:http://www.AutoBoardz.com/740-Turbo-Gas-speedometer-ftopict206723.html
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Jamie

External


Since: Mar 03, 2006
Posts: 183



(Msg. 5) Posted: Tue Feb 20, 2007 4:45 pm
Post subject: Re: Volvo 740 Turbo, Gas Use and speedometer [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Feb 20, 6:25 pm, Ed wrote:
> flop580 wrote:
> > I have a 1990Volvo740 Turbo sedan that's had a lot done in the past
> > couple of months. The brakes have been redone, most of the exhaust
> > system has been replaced and it's currently having the water pump
> > replaced and the coolant system is being patched for leaks. My other
> > problems however are gas use and the speedometer. The car manual says
> > that it should get somewhere near 22mpg and I figured during the
> > winter it wouldn't be as good but recently it's really been downing
> > fuel. With the turbo only taking premium gas and fuel prices being
> > where they are this has really become an annoying problem. Anyways I
> > was wondering if anyone has any suggestions of where to look to try
> > and get some better mileage. The other problem is the speedometer.
> > It's been broken since I bought the car about a year ago. I did ask
> > someone's opinion on it, the person who did the brakes actually. He
> > said that it isn't the actual speedometer thats broken because the
> > odometer doesn't work either. He thought that the speed sensor was
> > probably what needed replaced but regardless I figured I would get
> > some other opinions if anyone has any. Thanks for any advice you can
> > give.
>
> simple question
>
> How can know what the mileage is if your speedo doesn't work?

My odometer works fine - the speedo can go out and everything else
still work. That's how you know the speedo problem is not at the
sensor but in a speedo gear.
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Ed

External


Since: Feb 20, 2007
Posts: 1



(Msg. 6) Posted: Tue Feb 20, 2007 7:25 pm
Post subject: Re: Volvo 740 Turbo, Gas Use and speedometer [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
flop580 wrote:
> I have a 1990 Volvo 740 Turbo sedan that’s had a lot done in the past
> couple of months. The brakes have been redone, most of the exhaust
> system has been replaced and it’s currently having the water pump
> replaced and the coolant system is being patched for leaks. My other
> problems however are gas use and the speedometer. The car manual says
> that it should get somewhere near 22mpg and I figured during the
> winter it wouldn’t be as good but recently it’s really been downing
> fuel. With the turbo only taking premium gas and fuel prices being
> where they are this has really become an annoying problem. Anyways I
> was wondering if anyone has any suggestions of where to look to try
> and get some better mileage. The other problem is the speedometer.
> It’s been broken since I bought the car about a year ago. I did ask
> someone’s opinion on it, the person who did the brakes actually. He
> said that it isn’t the actual speedometer thats broken because the
> odometer doesn’t work either. He thought that the speed sensor was
> probably what needed replaced but regardless I figured I would get
> some other opinions if anyone has any. Thanks for any advice you can
> give.
>
simple question

How can know what the mileage is if your speedo doesn't work?
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