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Old 10-31-2008, 12:28 PM
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If I take my cats off and do not put them back on would that help my power and fuel mileage or would it mess the engine up. Never really dealt with exhaust that much. Any and all, advice is greatly appreciated. BTW in alabama we do not have any emmissions test so that would not be a problem.
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Old 10-31-2008, 01:16 PM
marc olivares marc olivares is offline
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if this is on your 98, if you run without the cats you will have a constant 430/420 code and a check engine light. if that doesnt bother you, then go for it. you wont feel any gains in removing them, unless your current cats are plugged beyond belief. in which case you will already have a code for this issue and it will be a non issue for you.
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Old 10-31-2008, 01:34 PM
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To add to marks comment and address the other question about fuel mileage yo most likley won't see a great increase something more like .5mpg more... at least that has been my experience.
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Old 10-31-2008, 01:38 PM
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not if your engine is running the way it should. But if you are having o2 problems and have bad cats, then yeah it would help. I do not recommend this though, nor do I know of many on here who would.
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Old 10-31-2008, 01:41 PM
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Good point Scott

Personally I don't advocate it just because what is the point?

At the risk of sounding like a tree hugger: Te cats are a slight help to th environment and bring down the number of contaminants that our gas hogs are constantly expelling...
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Old 11-01-2008, 01:28 PM
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I've seen on ebay a little bung you add to your rear O2 sensors that makes the sensor farther away from the exhaust stream. This should keep the check engine light off after a few drive cycles. The bung was for Audi so it wouldn't fit D1 O2's but the theory should work if you could find one for D1.
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Old 11-02-2008, 03:37 PM
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thanks guys, I think that i will just leave them on. I was under the impression that it would make a big difference in power and fuel mileage.
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Old 11-02-2008, 04:01 PM
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have you read some of the posts about buying generic cat's to replace yours with. If you can find "a good 'ol boy" shop they can do just about anything. I know a guy local that does great work REALLY cheap.
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Old 11-02-2008, 05:17 PM
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My 99D1 had the orig Cats, and at 120K, ran with NO power, I had them replaced with 'test pipes' and the power diff is HUGE! now I know that the cats must have been VERY clogged for it to make this much of a difference, but when was the last time they were replaced? If they are newer, then its not really worth the bother, but if they are old, its worth a shot...
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Old 11-02-2008, 06:28 PM
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Catalyst don't fail unless some outside force (or foreign object) causes them to. If your rover is not running right (IE: an o2 sensor problem that goes unsolved for some time or a lot of cylinder misfires that go uncured) then they would be more prone to failure.
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