Question about 1998 Chevrolet Blazer

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Removing a cat converter on a 1998 s10 blazer 4.3

Can I remove my cat and put a pipe without hurting anything on my 98 s10 4.3

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    trip meter doesn't work how do I remove console cover

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You can safely remove the convertor as you asked but depending on your location your vehicle may not pass a safety or emissions inspection.

Posted on Sep 13, 2008

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2 Answers

Can you use a substitute regarding your catalytic converter like a long pipe


According to federal law, you can use a "test pipe" for testing purposes, but removing converter for street use can cost you big fines and even jail.

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If there is no flange just in front of the cat then it has to be unbolted from the manifold, If this is not possible you will have to cut pipes and purchase sleeves to connect afterwards hope this helps.

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Sounds like the catalytic converter. Remove the cat and put in a test pipe or just run it with out anything "it will be loud" and see if it drives normal. If it does replace the cat. If not check all plugs, wires, dist cap and rotor, and coil. I wouldn't hurt to clean the throttle body as well.

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Yes it will still run. But running w/o a cat is illegal. And you will fail any emissions test. Also you will lose gas mileage. Hope this helps, James Booth

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1 Answer

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The upstream O2 sensors will be before the catalytic converter just down from where the exhaust pipe(s) attache to the exhaust manifold. The downstream O2 will be right after the catalytic converter. Once you crawl under the vehicle they will be pretty obvious where they are in the exhaust pipe.

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1 Answer

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It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift. Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps. 

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1 Answer

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Yes, you have to order the same size. You also need a coupler that joins the pipe to the Cat.

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1 Answer

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you can do it without weldind. If the old one is welded on then you will have to get another pipe to extend the pipe or get a cat long enoungh to fit the space than muffler clapit in place.

Feb 12, 2009 | 1984 Chevrolet S-10

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