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Old 03-18-2008, 08:47 PM
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gas mileage

i have bad gas mileage in my 1983 malibu. its an 305 with 200 r4 overdrive transmission. I was wondering what could be done to make better gas mileage. I have done a tune up, new air filter already. the quadrajet might not be set right or running to rich. i dont know.
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Old 03-18-2008, 08:50 PM
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Quote:
Originally Posted by bigtank05
i have bad gas mileage in my 1983 malibu. its an 305 with 200 r4 overdrive transmission. I was wondering what could be done to make better gas mileage. I have done a tune up, new air filter already. the quadrajet might not be set right or running to rich. i dont know.
What do you think would be good mileage against what it gets?

Bogie
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Old 03-18-2008, 09:01 PM
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i dont know. my brother has an 85 caprice that gets damn good gas mileage with a 305 with 700r4 trans. i attend school at baylor university in waco texas and i stay 20 miles outside of waco. i use about 30 dollars for 3 trips a week to school but when im back from class im almost on empty or run out cause my gas hand works sometimes and i dont see my gas reading.
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Old 03-18-2008, 09:33 PM
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Advance the cam 4 will help a lot.
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Old 03-18-2008, 09:40 PM
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are you sure your malibu has a 305 and not a 267?
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Old 03-18-2008, 09:55 PM
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Replacing an old lazy oxygen sensor will raise fuel mileage up to 2 MPG.
To check your carb settings on a computerized carb is simple. Warm up car, run engine at 2000 RPM for 2 minutes after engine is warm.
Attach the red (positive) lead of a dwell meter set to the 6 cyl. scale to the "Kelly" green connector by the carburetor and the black ground lead to a good ground on the engine. Run the engine at idle you should read 30-35 degrees dwell. Now run engine at 2500 RPM and read the dwell, it should read around 35-40 degrees dwell.
If it reads lower dwell computer is adding fuel due to a lean running carb, higher dwell and your computer is subtracting fuel due to a rich running carb.
6 degrees full rich command-55 degrees is full lean command.
Advance your base timing 2 degrees from timing specs. remember to disconnect the 4 wire connectors at the distributor to set timing and to reconnect it when done. Dale
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Old 03-20-2008, 03:33 PM
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Giving this a bump since I inadvertantly (sp?) deleted it a few days ago.

Mark
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Old 03-20-2008, 05:42 PM
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Only drive downhill.
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Old 03-20-2008, 11:19 PM
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Quote:
Originally Posted by runn141
are you sure your malibu has a 305 and not a 267?
yeah its a 305. its a ex cop car from forth worth police department. how do you advance the cam.
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Old 03-21-2008, 12:36 AM
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you use these bushings when you install the cam in the middle of the cam goes a bushing and you install an offset one to change that.This should give you more low end and throttle response but less on the top end
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Old 03-21-2008, 12:36 AM
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http://store.summitracing.com/partde...0&autoview=sku
heres a link to them
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Old 03-21-2008, 01:08 AM
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You got a leaky spark tube...
 
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Exactly what mileage are you getting?

You're driving 180 miles a week and burning 30 dollars of gas. I don't know what the price of gas is there but if you're paying $3.00/gallon and burning 10 gallons then that's 18 mpg which I wouldn't think would be too bad for a mid 80s V8 powered car...
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Old 03-21-2008, 07:49 AM
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What rear end gear ratio does your car have? Switching to a lower gear will help get the car moving more easily.
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Old 03-21-2008, 09:47 AM
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Quote:
Originally Posted by Blazin72
Exactly what mileage are you getting?

You're driving 180 miles a week and burning 30 dollars of gas. I don't know what the price of gas is there but if you're paying $3.00/gallon and burning 10 gallons then that's 18 mpg which I wouldn't think would be too bad for a mid 80s V8 powered car...

gas is 3.15 here where i stay. my car is all original expect the overdrive transmission i put in the car.
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Old 03-21-2008, 09:49 AM
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You got a leaky spark tube...
 
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Quote:
Originally Posted by bigtank05
gas is 3.15 here where i stay. my car is all original expect the overdrive transmission i put in the car.
Ok, so have you sat down to figure out your actual mileage? What kind of gas mileage are you expecting?

I just realized six 20 mile one way trips don't equal 180.... So much for those high school math classes...

Last edited by Blazin72; 03-21-2008 at 09:57 AM.
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