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Old 07-30-2009, 07:27 PM   #11 (permalink)
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Also, 3/8" thick weatherstripping along the bottom of the hood and grille makes a difference. My engine bay doesn't get as dusty anymore since installing that.

Small individually, large effects when taken together.

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Old 07-30-2009, 08:08 PM   #12 (permalink)
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Do those have the 3800 engine in them?
My impala has that engine and I don't get that good gas mileage on the highway.
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Old 07-30-2009, 08:18 PM   #13 (permalink)
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Yep, 3800 Series II/4T65-E combination.

The W-bodies such as your Impala are capable of getting the same mileage. First thing I'd recommend is deleting the crimp GM put in your Impy's exhaust so it's even diameter the whole length like the H-body, ie LeSabre and Bonneville, exhaust is.
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Old 07-30-2009, 08:25 PM   #14 (permalink)
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Get rid of a crimp? Where is it and how do I get rid of it?
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Old 07-30-2009, 09:39 PM   #15 (permalink)
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Quote:
Originally Posted by 99LeCouch View Post
Yep, 3800 Series II/4T65-E combination.

The W-bodies such as your Impala are capable of getting the same mileage. First thing I'd recommend is deleting the crimp GM put in your Impy's exhaust so it's even diameter the whole length like the H-body, ie LeSabre and Bonneville, exhaust is.
Interesting; my wife has a W body (98 Intrigue) with the 3.8. She's only gotten as high as 28 mpg with highway only trips, even with my driving. I'm all ears about this crimp in the exhaust from a GM person. I only know Fords.
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Old 07-30-2009, 10:49 PM   #16 (permalink)
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ZZ Performance

An explanation of the U-bend. Not all 3800-powered cars have this. My LeSabre has a straight exhaust after the cat.

Also, these engines like copper-core plugs changed every 30k miles and hate Bosch O2 sensors. Plus maintaining the transmission every 30k as well.
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Old 07-30-2009, 11:56 PM   #17 (permalink)
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How much does it cost to fix?
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Old 07-31-2009, 12:02 AM   #18 (permalink)
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I don't know, my car doesn't have this. It's likely not much more than a few dollars for a piece of pipe with an O2 bung and a few clamps.
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Old 07-31-2009, 12:15 AM   #19 (permalink)
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I don't know, my car doesn't have this. It's likely not much more than a few dollars for a piece of pipe with an O2 bung and a few clamps.
I see, thanks.
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Old 08-04-2009, 12:41 PM   #20 (permalink)
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The Impala might have a sportier final drive ratio like 3.33, which would likely cut into mileage if the 2.84 or 3.06 is sufficient to move the car down the highway.

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