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Low MPG in '91 DX

Old 04-16-2012, 11:05 AM
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Scott479
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Default Low MPG in '91 DX

I have a '91 with 145,000, my dad has a '90 with 75,000. He get 38+ I get 28 mpg.

My plugs and leads, ignitor, fuel and air filter are new, where should I look next for the gas hog? I recall having a vacuum gauge will help in isolating some parts failures in fuel delivery?
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Old 04-16-2012, 09:13 PM
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ChrisS
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Some of the gas mileage depends on how (smooth easy stops and starts, jackrabbit stops and starts) and where (stop&go city, highway) you drive.

Things to check:
-timing to spec
-plugs gapped correctly
-valve clearances correct
-how's the fuel/air mixture (lean or rich; black tail pipe can mean too rich)
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Old 04-19-2012, 07:21 AM
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Timing/gaps are good, will check the tailpipe soot. The valves I don't know about right now.
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Old 05-24-2016, 07:59 AM
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Maybe check the fuel filter, I know it's small but you never know.

Renato
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Old 06-01-2016, 11:47 AM
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Check vacuum lines.
There's a thin one that leads from the intake manifold to a sensor (MAP, I think) on the firewall.

Take care,
ChrisS
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