Question about 1989 Ford Mustang

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Why is my mustang burning a lot of gas - 1989 Ford Mustang

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Might need a tune up

Posted on Aug 11, 2010


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Burning a lot of gas

your O2 sensor must be out. It is in charge of reading you fumes output to determine if you are running too much or too little gas. When this goes out, your car will go in default mode and push more gas in. In return, your car will burn more gas

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Burning a lot of gas.

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MPG? is what.

or liters per 100km (metric) ROTW

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Smokes and smells like gas at muffler

That has to be gas that is not being burned! No idea why blowing a fuse with the air compressor rashed your car like that - must be coincidental or collateral damage.

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Whats carbon deposits on valves?

carbon is from the fuel burning. There are additives you can add to your gas to help prevent this from happening or a good blast down the highway putting the gas to the floor and you might see some black smoke coming out of the exhaust thats carbon burning off. Carbon can build up if the car is driven easy all the time. or crappy gas doesnt help either. If the carbon is real bad it can start hanging valves open and make it run like ****.If it gets bad enough no power then would have to remove the valves to clean them.

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My 98 mustang cobra was being stored and occasionally driven by my daughter. It started clattering at1800 rpm. When she checked the oil it was 3.5 qts low. There is no evidence of it burning oil or of a...

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I have a 2000 ford mustang v6 I was putting 89 octane gas in it. my manual said to burn 87 octane so i'm burnning 87 now .but when I accellerate I get a knocking, rattling sound took it to a ford dealer...

Humm, give it some time. there are upper cylinder cleaners, but I worry about converter damage, and oxygen sensor damage. The lower the octane, the hotter and more masssive the burn, exactly backwards from what you would think, but higher octane is slower burn and av.gas is really, really slow.
Ford has had slow to start issues that traced back to drivers using too high octane....

Still, if it keeps pinging, you may need to run higher than spec octane.
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Why is my mustang burning a lot of gas

could be anything from a dirty air filter to worn valve seats and piston rings ,even a brake binding or the clutch slipping

Mar 20, 2010 | 1989 Ford Mustang

2 Answers


you likely ended up with a lot of water and sediment in your fuel. First thing to try is a bottle of gas line anti-freeze as it absorbs any water in the fuel system. you may consider fuel injection flush and a new fuel filter.
adding a bottle of injection cleaner may work well too.


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1 Answer

2000 mustang smell of either gas or something burning

Its probably leaking and your losing fluid, take it back to the shop

Dec 27, 2008 | 2000 Ford Mustang

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