Increase fuel economy

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Increase fuel economy

Post by leopard_pagan on Wed Apr 17, 2013 6:41 am

Only done 125miles on tank and already needle is almost on the E

What things can I look at to improve fuel economy?
Different spark plugs?
New HT leads?
Already removed the seats from the back.
Can you run a fuel cleaner thru with EFI?
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Re: Increase fuel economy

Post by HighlyJetted on Wed Apr 17, 2013 9:27 am

Inspect the air filter and spark plugs.

Check the spark timing with a timing light.

They don't have HT leads, its just two coil packs with two built on leads. But one of those could be on its way out, but I'd expect misfire.

Check non of the brakes are dragging on any wheels.

Test some sensors - I'd go with TPS sensor, MAP sensor and the Lambda sensor as they are the ones that aid the fuel control.

Or the silencer could have collapsed, that would destroy your fuel economy.
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Re: Increase fuel economy

Post by Logi on Wed Apr 17, 2013 10:02 am

All of the above. Fill a can and run out. May just be an iffy guage? Get yer emissions checked.
How are you driving it? Driving style is the easiest way to improve economy. I can manage 29mpg in the Merc. But if its sunny I can get it down to about 15 Wink
I notice a marked drop in economy if I sit at 70 as opposed.to 55ish.
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Re: Increase fuel economy

Post by leopard_pagan on Wed Apr 17, 2013 12:42 pm

The only time I went fast in this was last weekend on the way home.. 1st drive.
Fuel gauge is iffy as doesn't go to full with a full tank.. But it does drop down to E when it should.

Commute to work is 60ish mph, I don't accelerate harshly & being a biker I plan ahead so don't often need to brake/accelerate suddenly.

Silencer & Cat are all one piece & look fairly new.

Will get new plugs & air filter as a start.
How do you test sensors?
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Re: Increase fuel economy

Post by HighlyJetted on Wed Apr 17, 2013 12:49 pm

With a multimeter!

If you want to test them, I will spend an hour with my multimeter on my van and take some photos so you can just follow the guide and see if your results match.

It's pretty damn easy to do if you have a cheap multimeter.

What I found on civics that weren't giving good fuel economy is the throttle position sensor would be damaged inside from water or rust - so it was technically still present according to the ECU but always giving a 90% pedal down signal - thus always over fuelling. But the same could happen to the map sensor too.
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