Crappy mpg !?!?! - Page 3 - 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 07-26-2005, 01:22 AM   #21
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roughly 7-8 psi is that seem liek an ormal amount? in other words doesnt reach the yellow area
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Old 07-26-2005, 02:56 AM   #22
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Clogged catalytic converters can kill MPG/performance. You'll notice bad performance though.

7-8 is normal for boost on a stock motor.
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Old 07-26-2005, 09:20 AM   #23
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Lux...let'* start off with the easy stuff.

When was the last time you changed the air filter?
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Old 07-26-2005, 09:23 AM   #24
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I think im just gonna go and buy all the basic stuff for a tune up. air filter fuel filter oil filter 180 t stat maybe a pcv valve and a new tube for my evap canister. Does that sound like a good idea?
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Old 07-26-2005, 09:26 AM   #25
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if my cat converter was clogged how woudl you go about fixing that? Buy a new one?
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Old 07-26-2005, 10:51 AM   #26
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a typically clogged or bad catalytic would rattle when kicked and make the car feel very restricted at WOT. Also it will usually heat up the motor pretty well. But with the heat we've all been seeing this year it may be tough to say it'* a cat or not.

You should see some good improvements from the basics you mention above.
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Old 07-26-2005, 11:14 AM   #27
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Don't forget a bottle of fuel injector cleaner next tank, tire pressure, and more.
Hows the alignment.
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Old 07-26-2005, 12:42 PM   #28
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I have new tires rotated and all that fun stuff. With the cat im not so sure i do feel like there is a load on the engine but it still has soem get up and go just not spin the tires awsomely get up and go lol.
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