Re: IML: '83 EFI Stumbles
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Re: IML: '83 EFI Stumbles






Leo Heligas wrote:
Rob,
What would happen if I just removed the front Cat? If I remember correctly. this has been going on (the stumbling) ever since I bought the car in 1990. I will also check out the EGR valve.
Leo

The front cats are there because the cats, especially earlier ones did not heat up and start working fast enough. They are smaller and designed to "light off" more quickly. There should be no driveability problems with removing them. I believe there are two, one for each side and then they Y and lead up to the main car. There may be some pollution and inspection problems with the car if you remove them, depends on your location. You may be able to get away with an FMJ body y pipe with no cats. You have to check because the exhaust systems can be different. There are ways to check if the cat is clogged, but I'm not sure what they are. Something about the temp of the pipe ahead and behind the cat, and some kind of pressure test that requires drilling a hole. The FSM has the EGR test in the pollution control section.

Rob




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