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Excess Gas consumption

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Namo
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Excess Gas consumption

Post by Namo » Sun Dec 01, 2019 3:32 pm

Hello guys, I'm new here. I've just purchased my first Volvo. A 2002 volvo s60 2.4 non-turbo with an automatic gearbox. Car consumes a lot of gat. I currently get maximum of 90 miles with half tank in city driving. The car has no check engine, Scanned and found no error code. I've changed the Airflow meter, map sensors, O2 sensors, fuel pressure is fine, injector system is fine. Car idles at 8,500. I am beginning to think this is an issue with the ECU. Any input will be appreciated.



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June
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Re: Excess Gas consumption

Post by June » Sun Dec 01, 2019 6:46 pm

It can't idle at 8,500 rpm. That's way above the Redline. These cars are set to run Premium fuel and get less mpg on regular to protect the engine. Also heavier oil affects mpg as well. So exactly how many gallons does it take to refill after 90 miles? In town driving only my S80 2.9 6 cylinder turbo gets around 14 mpg on Premium fuel, 21 mixed, 24 all interstate (80+mph) I loose around 3 mpg on Regular fuel.

Go to the EPA website and see what your car is rated mpg. Notice the EPA will say on Premium fuel. Likely nothing is wrong with your car. June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

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June
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Re: Excess Gas consumption

Post by June » Sun Dec 01, 2019 6:58 pm

Here are screenshots of mpg. One circled is AWD 2.4 automatic other pic is FWD 2.4 automatic. Notice on Premium fuel specified. June
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My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

Namo
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Re: Excess Gas consumption

Post by Namo » Sun Dec 01, 2019 10:47 pm

June wrote:
Sun Dec 01, 2019 6:58 pm
Here are screenshots of mpg. One circled is AWD 2.4 automatic other pic is FWD 2.4 automatic. Notice on Premium fuel specified. June
Hi June.
I appreciate your response. Just to be clear, does this mean driving without premium gas and getting about 95 miles out of a half filled tank is OK?


2002 volvo s60 2.4 non-turbo, Automatic gearbox.

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Re: Excess Gas consumption

Post by 99commutervolvos70 » Sun Dec 01, 2019 11:05 pm

You should fill fuel tank to FULL, then drive the vehicle. I would wait at least 200 miles, then fill the tank to FULL. See how many gallons it took to fill the tank to FULL. Divide the amount of miles from how many gallons, there is your MPG.
Driving style can be a big factor in fuel mileage. I keep very good records on my fuel economy, my worst was 17.7 mpg, my best was 25.36 mpg.



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June
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Re: Excess Gas consumption

Post by June » Mon Dec 02, 2019 12:35 am

There are factors you are not specific about. For example 15W40 oil, regular fuel, all trips less than 5 miles less than 45 mph, I could see 10 to 12 mpg assuming your car is running perfectly.

Also do you idle the engine excessively such as 20 minutes twice a day in school traffic to drop off and pick up your children. As the person said above you need to figure out exactly what your gas mileage is by filling the tank, than driving the 90 miles and refilling the tank.

90 miles ÷ the number of gallons used will tell us exactly what your mpg is. Also (for example) if your gauge is off and showing 1/2 tank used for say 6 gallons in 90 miles which would mean 15 mpg. Your car should have a 18 gallon tank which means if the fuel gauge is reading correctly, 1/2 tank should be 9 gallons. 9 gallons used in 90 miles would be 10mpg. 10 mpg would be conceivable if 90 miles = 90 1 mile trips. The engine runs rich on a preset value ignoring the oxygen sensor until the engine and oxygen sensor warm to operating temperature. So starting the car and driving 1 mile and shutting it down would likely cause the engine to never leave the rich mode = poor fuel economy.

Also you need to run the car 90 miles on the interstate in one drive and figure the mpg out under that condition as well to check the highway mpg (the last number provided by the EPA) June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

Namo
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Re: Excess Gas consumption

Post by Namo » Mon Dec 02, 2019 11:09 pm

Thanks for the response guys. I have a 300 miles trip on the 17th of this month. That should give me time to really check the MPG and would also be the first time driving over 30 miles in a single trip since I purchased the car.


2002 volvo s60 2.4 non-turbo, Automatic gearbox.

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June
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Re: Excess Gas consumption

Post by June » Tue Dec 03, 2019 1:21 am

Don't forget to post back that highway mpg. Also use Premium fuel for that trip. June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

Namo
Posts: 7
Joined: Sun Dec 01, 2019 3:25 pm
Year and Model: 2002 volvo s60
Location: Lagos
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Re: Excess Gas consumption

Post by Namo » Wed Dec 04, 2019 2:24 am

Sure, I will.
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2002 volvo s60 2.4 non-turbo, Automatic gearbox.

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Re: Excess Gas consumption

Post by oragex » Wed Dec 04, 2019 9:30 am

Namo wrote:
Sun Dec 01, 2019 3:32 pm
Car idles at 8,500

If you don't mind a typo joke, 8500 idle sounds more like a jet turbine

800 rpm idle is correct for the 2.4 non turbo, some say they see 650 but most stay at 800-850rpm

Anyhow, these engines don't like frequent stop and go - not sure what kind of traffic you get in your city. When I bought my non turbo I was getting 17L/100km by the computer in city driving (about 14mpg). After a few 'fixes' I got it to 14.5L/100km. Then I did a rather 'aggressive' coolant flush (see below), and now I'm at about 10.5L/100km or 22mpg - spot on at the rated mpg for this engine in city driving. I'm using only regular 87 gas (regular).

You mention having changed several things. Not sure if the parts were genuine (or the brands that make the genuine parts), otherwise, inexpensive parts can affect the fuel mileage. Was the gas consumption already poor before replacing these ?

In particular the front O2 sensor can affect the mpg in city driving You numbers seem to indicate a fuel consumption close to 20L/100km (12mpg) which is very poor and could easily be caused by a poor from O2 sensor in city driving.

Dragging breaks can also affect mpg badly. Transmission fluid may also play a role on mpg.

Look first at this common problem www.youtube.com/watch?v=gOx3Q8vqoz4

You may also have a fuel filter if it has the plastic gas tank

Now, on mine I've tried several things to improve the mpg. Cleaning the injectors in an ultrasound bath helps, having the correct spark plugs, having a PCV in good condition (see Youtube). But by far the thing that helped the most is something that may seem very strange and I'm pretty sure doesn't make sense apparently. I'm going to describe it knowing that many will read and disapprove this. At least on my engine, previous owners mixed the coolant with tap water - or maybe they just rinsed the cooling system with a hose which traps a significant amount of tap water. Tap water causes limestone deposits after a while. I believe on these engines this can block the coolant from flowing in some areas around the engine block - I know, it sounds silly, but just my opinion. What I did this summer is I drained the old coolant, and refilled with distilled water + 2 full bottles of Prestone Radiator Flush - this is much more than the recommended amount which creates a lot of foam and expands a lot inside the reservoir so it needs some monitoring. I've driven like this for 2 months (yes, much longer than the 3 days required). Then flushed everything several times with distilled water (several drains and refill). Interesting fact: before this flush, I could only pour into the system about 5 liters. After the flush, I could pour 7 liters. After the flush my gas mileage changed from 14.5L to 10.5L/100km. I know it sounds suspicious but these are my numbers.



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