Crappy mpg !?!?! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-25-2005, 08:17 PM   #1
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Default Crappy mpg !?!?!

I am still getting horrible mileage i replaced the 02 sensor with ac delco i have new spark plugs and generic new spark plug wires. Is there anything else that could cause this. also there is a rip in one of the tubes that goes to the evap canister would that affect anything? for all and any inpuit
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Old 07-25-2005, 09:56 PM   #2
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Yes, replace the torn vacuum line going to the evap canistor. It recycles fuel vapors.
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Old 07-25-2005, 10:02 PM   #3
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When'* the last time the fuel filter was replaced?
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Old 07-25-2005, 11:19 PM   #4
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Quote:
Originally Posted by smellbird
When'* the last time the fuel filter was replaced?
How much does this affect gas mileage? Because mine is bad, but I don't think it is bad enough for a fried O2. BTW, I am getting 17 MPG mixed driving conditions.
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Old 07-25-2005, 11:44 PM   #5
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Always a good idea to replace fuel filters regularly (every 30,000 miles or 2 years) for many reasons. 1 A plugged filter is hard on the pump, 2 A plugged filter will deteriorate your MPG and performance, 3 A filter that stays on too long does not like to come off....rusts on.

As for your problem, I would definately clean the MAF sensor just because it is easy and free! Also fix your EVAP line leak <<< A MUST! Just for the simple reason that you know its a problem and you know it will hurt mileage.
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Old 07-25-2005, 11:45 PM   #6
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Yeah i figured the torn line went to the fuel so i did a temporary patch of it. I mean im getting horrible mileage i haveto put in 10 dollars every other day to keep myself away from the Empty line. My gas guage fluctuates weridly at times and idk if this is normal but i can drive around for a long time under the Empty line.I am not sure how long though im to chicken to see how far i can go before it stalls.
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Old 07-25-2005, 11:47 PM   #7
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I never replaced the fuel filter can that cause horrible mileage? I would figure it would just be aperformance thing instead of mileage but i guess it makes sense to have cleaner gas to burn more efficently.
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Old 07-26-2005, 12:07 AM   #8
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Check your fuel pressure regulator also.

It sounds like you may have a bad sending unit in the fuel tank giving you false readings...which won't affect your fuel mileage but will trick a person into thingking they are getting bad mileage. If you actually test your MPG the right way, you don't need a fuel guage.

And yes a plugged filter can affect mileage because it can reduce fuel pressure under heavy load conditions---this results in an unsaticfactory spray pattern from the injectors which results in poor combustion charicteristics---which results in lack of power and a poor burn rate of the fuel.
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Old 07-26-2005, 12:15 AM   #9
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what is the right way to test your fuel milage i just go by what i pit in and the trip meter. How do i test my fuel pressure will a code reader give me this useful info im thinking of buying one
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Old 07-26-2005, 12:35 AM   #10
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Where should i buy a sending unit from and is it a large job to replace the unit? also to save me time and money is there anyway to test if its good or bad?
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