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Old 10-07-2006, 05:41 PM
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Terrible Gas Mileage

Hi, I Just Bought A 96 Chev 1/2 Ton Pick Up With A 305-700r4 -163000k Miles. It Is Only Getting 9 Mpg On Highway With No Load. I Have Changed Air Filter But That Didnt Help At All. Iam Next Going To Change The Plugs. Any Suggestions As To What Else I Can Do Or Where I Can Look For Problems. Thanking You For Your Help.

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Old 10-07-2006, 06:10 PM
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Doc here,

Full Tune up..

New Plugs, Now Module, New Cap, New Rotor, New Coil, New Plug Wires, Replace The PCV Valve, Inspect and renew Vacuum Hoses, New Fuel Filter, New Air Filter, New Oil & Filter, Pull Codes, and repair any sensors that are coding, Check and Set timing, Run Injector / Carb cleaner through the system..

Don't look for huge changes in MPG though...In that truck, Depending on what your using it for and the rear ratio, and how much "Junk" you got sitting in the back, Tail gate up.. 10 to 12 is about normal..

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Old 10-07-2006, 06:43 PM
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Without knowing what's been changed before you bought it, I'd have it scanned first to see if there are any major problems. If it scans ok, then you can do a basic tuneup, but like Docvette said, don't expect a huge improvement, but personally, i'd expect more than 12 on that setup. Also, make sure the trans is functioning properly too, as in lockup working at cruise speed.

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Old 10-07-2006, 07:39 PM
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Originally Posted by docvette
Doc here,
....how much "Junk" you got sitting in the back, Tail gate up.. 10 to 12 is about normal..

Tailgate up for better gas milage as per Myth Busters.
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Old 10-08-2006, 12:27 AM
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Replace the timing chain, with that many miles the factory one is past worn out. We just did this on my fathers 98 GMC, made a huge difference in power and mileage.
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Old 10-09-2006, 09:28 AM
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What is the rear end ratio?
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Old 10-10-2006, 11:21 AM
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Make sure your speedometer and odometer are indicating correctly.
I time mine down the interstate that has mile markers. I have backed this up with GPS. Fill up at the same pump to the same level in your tank (as close
as possible). Use you corrected miles travelled. Then average your readings. You might be suprised.
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