Checking the cat
09-10-2003, 08:56 PM
#1
Cruising
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Checking the cat
I have an 82 that may have a plugged converter. I plan on testing it by driving the car without the converter. Since this is a computer controlled car, will it run poorly without the proper emission feedback?
09-11-2003, 01:57 AM
#2
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Location: The Only Corvette in Gila Bend, Az.
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St. Jude Donor '09
Re: Checking the cat (LEEZZER)
Well you won't have any problems going without it, Mine is sort of hollow, and has been for awhile.
I don't have emmisions testing here, so I can get away with it.
I don't have emmisions testing here, so I can get away with it.
09-11-2003, 05:37 AM
#3
Safety Car
Re: Checking the cat (LEEZZER)
How does a vehicle get a plugged converter? Emissions gas flows through the particulate. I can only imagine it getting plugged if there is excessive heat and the particulate breaks down.
Removal will affect performance. The system is tuned to run with it in place and the A.I.R. squirt O2 to the converter to complete combustion.
Removal will affect performance. The system is tuned to run with it in place and the A.I.R. squirt O2 to the converter to complete combustion.
09-12-2003, 12:27 AM
#4
Racer
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Re: Checking the cat (hunt4cleanair)
Here are some links on the subject.
http://www.howstuffworks.com/question482.htm
http://www.auto-repair-info.com/cata...converter.html
http://www.misterfixit.com/cat.htm
Dane
09-12-2003, 04:38 AM
#5
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Re: Checking the cat (LEEZZER)
Check this out......... http://forums.corvetteforum.com/zerothread?id=265301
:smash:
[Modified by ROD NOCK, 4:46 AM 9/12/2003]
:smash:
[Modified by ROD NOCK, 4:46 AM 9/12/2003]
09-12-2003, 04:44 AM
#6
Instructor
Re: Checking the cat (LEEZZER)
most techs agree that most cats do not just go bad, they are killed. the cat will burn up any unwanted gasses attempting to exit your car. a rich or lean condition will cause premature failure. u can get away with out the cat (for testing purposes only, or course :U ) on the early carbed units w/o to much of a problem. the no cat issue is related to lack of backpressure on the O2. it will be unalble to read correctly due to lack of heat.
since your car is cross-fire, the O2 plays a vital role in the ECMs abilty to predict proper air to fuel ratio. no cat could possibly lower the backpressure to the point that the O2 is never heated. when the ECM detects a cool O2 it leans the fuel ratio in an attempt to heat the O2. this is only a theory, i have worked on very few cross-fire cars, so i am not sure as to the adverse effects.
u can also check the cat by drilling (or blowing w/ a torch) a small hole in the head pipe and checking the pressure pre the cat using a low reading pressure gauge (fuel gauge will even work, with the help of some form of home made adaptor kit)
:cheers:
also, most muffler shops around here will check convertors for free, in hopes of selling a new cat. might be worth asking around.
good luck
since your car is cross-fire, the O2 plays a vital role in the ECMs abilty to predict proper air to fuel ratio. no cat could possibly lower the backpressure to the point that the O2 is never heated. when the ECM detects a cool O2 it leans the fuel ratio in an attempt to heat the O2. this is only a theory, i have worked on very few cross-fire cars, so i am not sure as to the adverse effects.
u can also check the cat by drilling (or blowing w/ a torch) a small hole in the head pipe and checking the pressure pre the cat using a low reading pressure gauge (fuel gauge will even work, with the help of some form of home made adaptor kit)
:cheers:
also, most muffler shops around here will check convertors for free, in hopes of selling a new cat. might be worth asking around.
good luck