Re: IML: '83 EFI Stumbles

["Rob P" <fristpenny@xxxxxxxxxxx>]

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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