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Old 10-22-2007, 02:02 AM   #1
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Metro owners talk to me, restoring fuel economy. Others welcome too =)

Hey Metro owners or people who know about these cars.

I havent done a real test on fuel economy yet but it seems decent right now.

Car has 140,000 miles on it and I know the clutch was replaced last year and it has a new cat thats all I know about this car.

I recently did a top engine clean so I know Im going to need new spark plugs and wires soon.

I know an oil change is needed too. I noticed on the cap it doesnt tell me what weight oil this thing uses. I also cant seem to find the oil capacity of this thing.

What else should I look into replacing to restoring the fuel economy this car once had? How hard is it to install a tach? Didnt come with one stock.

Thanks
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Old 10-22-2007, 04:12 AM   #2
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You might want to look into the oxygen sensor. After 140000 miles, there is a good chance that, although it may not be dead, it may be sufficiently weak that it is causing a rich running condition. You might just want to go ahead and replace it. ESPECIALLY if it is cheap. You might also want to check the catalytic converter. Now I don't know anything about Metros specifically. But automakers have a NASTY tendency to use close-coupled cats (cats mounted directly to a short exhaust manifold and located right in front of/to the rear of the engine) on cars that are built for high fuel economy. Since cats that are THIS close to the engine tends to get REALLY hot exhaust, close-coupled cats have a tendency to deteriorate prematurely. And a clogged cat can DEFINITELY rerduce fuel economy. Take a look through it with a flashlight to make sure it is not clogged.
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Old 10-22-2007, 05:15 AM   #3
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I believe the factory recommends 5w-30 and they hold around 3.7 qts of oil.
This may not effect mpg too much, but you should clean the egr valve and passages thru the head. Metros are know to burn exhaust valves when the ports plug. Check out http://www.teamswift.net/viewtopic.p...&highlight=egr for specifics on this and other info.

What kind of mpg are you getting now?
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Old 10-22-2007, 06:03 PM   #4
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If you're not in a hot hot hot part of the country, you could probably get away with lighter weight oil - 0w20 - but only if the engine is healthy.

Before you even start replacing stuff, I'd get an accurate consumption baseline.
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Old 10-22-2007, 06:14 PM   #5
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A good tune up would be plugs, distributor cap/rotor, and fuel filter. I normally change plugs at about 20k, cap and rotor at 20k and fuel filter at 50k. Air filter I change when it is so dirty I can't see sunlight through it. I never change the wires unless they test bad.

If you still aren't getting mileage in the 40mpg range then check your sensors with a voltmeter, there are not that many of them so they are pretty easy to check. The oxygen sensor is like 17 bucks so it is not really worth taking it off to test it, just replace it. Get a vacuum gauge from autozone/advance or one of those types of places ~$20 and stick it on the dash to monitor the engine. The needle should be as smooth as possible with very little vibration, the more vibration you have the more likely something is wrong. Set your timing to 8 degrees instead of the recommended 6 degrees. All that should make sure your engine is running as good as possible.

As far as the rest of the car, check your tire pressure and set it to the max sidewall pressure. After driving for about 20 minutes check the temperature of the rims around where the lug nuts are and the front rims should be slightly warm and the back should be cooler. If one side is warmer than the other front or rear then you have a dragging brake or bearing.

Once you get it in the range of 40-45mpg tanks that is about what the car got stock. Then it is time to start modifying it to get as high a mileage as you can go.
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Old 10-26-2007, 09:49 AM   #6
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I put 5w-20 in last oil change . I figured with cooler weather and a seemingly tight engine I'd be fine.
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Old 10-26-2007, 01:26 PM   #7
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0w20 on 140,000 miles? Depending on the piston ring condition, they might not like that.

It takes 3 3/4 quarts

02 sensors for metros are ungodly expensive, or atleast in my area. Local store charges 200 and thats at cost for me, more for others. No vaseline..
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Old 10-26-2007, 09:09 PM   #8
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change the tranny fluid, it's commen to forget about, we put amsoil 5w 30 Manual Transmition Fluid in our metro and it seems to have liked it (over 50mpg last tank), but for the most part just do a tune up.
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