Mileage still killing me! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-29-2005, 10:28 PM   #1
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Default Mileage still killing me!

With the rise of gas prices and my car not gettign any better mileage its becoming very annoying... I have replaced fuel filter, spark plugs, wires, air filter, Oil filter with change of oil,and thermostat Is there anything else i should be changing? Also is this normal i shut the car off and i go to relive the fuel pressure and theres nothing there?
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Old 08-29-2005, 10:38 PM   #2
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Holy jeez, fuel pressure regulator. It'* letting your pressure leak down. With the car idling, pull the vacuum line off the FPR. Any fuel or really strong fumes?
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Old 08-29-2005, 10:50 PM   #3
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You didn't mention O2? That'* the prime suspect.

Edit....one other thing. If you're running that rich, your plugs are fouled again. And your cat may be toast.
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Old 08-29-2005, 11:20 PM   #4
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I haven't changed my oxygen sensor ever.

Car has 117K and still gets the same mileage as when it was new.
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Old 08-29-2005, 11:22 PM   #5
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Quote:
Originally Posted by Bob Dillon
I haven't changed my oxygen sensor ever.

Car has 117K and still gets the same mileage as when it was new.
Yours is a rare case. Most are starting to get tired at 60-75k.
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Old 08-29-2005, 11:24 PM   #6
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Probably the crappy California gas,
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Old 08-30-2005, 12:07 AM   #7
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Sorry lol most important thing and forgot to mention. I have a brand new 02 sensor lol sorry. so a FPR would be my next choice in tackling mileage?
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Old 08-30-2005, 12:15 AM   #8
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FPR only if the fuel is leaking back into the vacuum line.

And what brand is your O2 sensor?
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Old 08-30-2005, 12:35 AM   #9
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got it from gmpartsdirect so Acdelco? if it was a problem with a bad fpr what would be some signs to look for?
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Old 08-30-2005, 12:39 AM   #10
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Fuel leaking into the vacuum line.

(for the third time)
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