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MPG getting worse
Topic Started: Dec 8 2011, 04:13 PM (1,050 Views)
collom7
Fresh Fish
[ * ]
I've just bought me a 94 Geo Metro with the 1 liter, I've had it for a couple months now, and the first fill up I got 44 MPG. Every fill up since then has gone down almost exactly one mile per gallon, and on occasion it looses power (will not hold 55 MPH on flatland) but the power comes back after a minute or two. Any ideas? I'm new to the metro so I don't know a whole lot.
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crankcase


Just for kicks try a compression check, especially if it has not been rebuilt recently. There are several things that can cause your problem, but low compression is a common problem in the form of a burnt exhaust valve. A lot can be determined from looking at plugs; you will often find black, oily looking plugs with compression problems.
Edited by crankcase, Dec 8 2011, 06:08 PM.
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collom7
Fresh Fish
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i checked my compression today and all 3 cyl are at 130 i did'nt do a wet test though. the plugs look good and brown and i broke one of the wires so i just put new wires on it. do these cars have an in-line fuel filter? and where is it if they do? im also going to try some fuel cleaner and change the oil tommorow. thanks
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Bad Bent
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Facetious Educated Donkey

Welcome to your new forum, collom7! :coffee

130 is below acceptable but it will run until it gets around 100 psi. Time to consider a rebuild. You could try Seafoam maintenance to see if it helps any.

If your TB coolant hoses are cool it will run rich. They should be as hot as radiator hoses.
Posted Image

Fuel filter is located under the car behind the driver's seat. Click link; http://geometroforum.com/topic/2084120/1/
Power loss/return could also be a dirty fuel injector. A lot of us use Seafoam and some prefer Chevron Techron. There is a thread on cleaning injectors.
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Shinrin
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130 is below recommended, but it's definitely runnable. The fuel filter is located by the gas tank, near the drivers rear tire.
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snowfish
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Basic GearHead

At least the numbers are consistent. ^o) But very low. :shake You did hold the throttle wide open, right? :hmm I suspect not. :smackface

Since it was running fairly strong, your probably OK for a bit. :coffee

Anyway, a fresh tune up can't hurt one bit. Plugs, wires, cap & rotor. The fuel filter is on the frame rail back by the tank. A little bit of a production, but very doable. :gamerz

Welcome to the party. :cheers
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collom7
Fresh Fish
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no i forgot to hold the throttle open during comp test :banghead how much of a diff will this make. i started out at 43.8 mpg now on the last fill up its at 40.6
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Good bye


I am in the low 40s this time of year. It will get into the low 50s between June and September.
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Coche Blanco
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Troll Certified

Go ahead and test it with the pedal down. My guess? It's winter. Everyone gets worse mileage in winter.
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Johnny Mullet
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Fear the Mullet

I agree with Coche. Winter fuel mix hurts MPG's
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bogs
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Duct tape heals all wounds

The winter fuel mix might explain the mpg drops, but it does not explain the 2nd part of his question,
Quote:
 
and on occasion it looses power (will not hold 55 MPH on flatland) but the power comes back after a minute or two.
Just saying :dunno
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Coche Blanco
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Troll Certified

No doubt his engine is dead too. haha
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clarkdw


bogs
Dec 9 2011, 05:30 PM
The winter fuel mix might explain the mpg drops, but it does not explain the 2nd part of his question,
Quote:
 
and on occasion it looses power (will not hold 55 MPH on flatland) but the power comes back after a minute or two.
Just saying :dunno
And well said I might add. :)

Everything on the Metro is so cheap that it is worth setting up a baseline for yourself when you get a new to you one. Cap, rotor, wires, plugs, fuel filter, seafoam treatment ,trans fluid change and oil\filter change. Now you can ignore those things as potential problems for some time to come and know that you are not losing mpgs.

The WOT compression test is next. Then check ALL the grounds on the firewall, intake, trans, etc. Pull the connector plugs off the sensors on the TB and make sure they are clean and tight.
Winter fuel will lose you mpg but poor connections will give you intermittent cut out problems.
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