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i wondered why my car was slow

A

A3ON

CEG'er
Joined
Oct 5, 2005
Messages
51
Location
ALBUQUERQUE, N.M.
i decided to pull my Y-pipe off today and look what i found


when i 1st pulled my Y-pipe off
0526071901.jpg



what fell out
cat.jpg


runs 10x better
 
His sig says he has a 95, OBD 1 guys. I have 0 cats on my 95 mystique and no MILs, runs fine. I suspect he'll be just fine.
 
NorMich99SE said:
His sig says he has a 95, OBD 1 guys. I have 0 cats on my 95 mystique and no MILs, runs fine. I suspect he'll be just fine.
Click to expand...

From what I understand, MIL's are for the O2's after the cats. The rear O2's basically tell if you have converters or not.
 
281Thunder said:
From what I understand, MIL's are for the O2's after the cats. The rear O2's basically tell if you have converters or not.
Click to expand...

Correct, but if I'm remembering correctly (and I'm quite tired so maybe not) OBD 1 doesn't use the O2 to trigger CEL's, just monitor the exhaust and help the comp. control fuel. OBD2 has upstream and downstream and compares the readings from each to determine if the cat is functioning properly, if not, it triggers a MIL.
 
On my 95 SE I had headers and no main cat and didn't throw any CELs. I did not run MILs either. Every once in a while I would get a CEL, but it wouldn't stay on long enough for me to check.
 
95's only have upstream sensors, one in top of each manifold. 96+ have 4 one before and one after the cat on each bank, with the downstream sensors if you gut the cats you have to have O2 eliminators to trick the computer into thinking there are still cats.
 
NorMich99SE said:
Correct, but if I'm remembering correctly (and I'm quite tired so maybe not) OBD 1 doesn't use the O2 to trigger CEL's, just monitor the exhaust and help the comp. control fuel. OBD2 has upstream and downstream and compares the readings from each to determine if the cat is functioning properly, if not, it triggers a MIL.
Click to expand...


Ahhh yeah. I totally failed to notice it was a 95 which would make it OBD1. Right you are.
 
SVTJON87 said:
you know after looking at these pics. would a 99 throw cel's if mine were clogged or fell apart?
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clogged - probably not
gutted - yes

My 2000 3L SVT is getting the damn codes every week - I'm running stock manifolds, WeaponR y-pipe to stock everything. I'm going to build a MIL tonight - If it goes well, I may build a few extras for people on here who dont want to or trust themselves to make them.
 
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