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Author
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Topic: cats removed no engine light?
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302n/a
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Member # 1465
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posted
 
 
i removed my rear cats from my 02 gt and no check engine light came on? do they just come on when you remove the ones near the headers or what?And will my car pass smog like that?
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Raiders A's Warriors Sharks
Posts: 2605 | Registered: Jun 2002
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04 S281
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Member # 9229
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posted
I ran an off-road X-pipe on my 97 GT for over a year with no Check Engine light coming on. Eventually it did, and i'd use a scan tool to reset it, and it'd stay off for a good 3 or 4 weeks before coming back.
Posts: 1570 | From: Sacramento | Registered: Jun 2009
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dohc90lx
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Member # 11863
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posted
yes front cats are still taking care of the hc and co that the engine produces. so the check engine lamp wont turn on. but the rear cats do a majority of the nox reduction. so no it wont pass somg.
Posts: 129 | From: antioch | Registered: Apr 2012
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ed650
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Member # 9897
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is your car much louder now that you only have 2 cats?
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410w Hatch
306Ci Coupe
Posts: 1744 | From: menlo park | Registered: Apr 2010
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87 coupe
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Member # 10919
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posted
Isnt it as longest ur cAts are gone and your 02 censors are still in place light won't turn on
Posts: 2016 | From: Home | Registered: May 2011
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87 coupe
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Member # 10919
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posted
Isnt it as longest ur cAts are gone and your 02 censors are still in place light won't turn on
Posts: 2016 | From: Home | Registered: May 2011
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302n/a
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Member # 1465
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posted
quote:
Originally posted by dohc90lx:
yes front cats are still taking care of the hc and co that the engine produces. so the check engine lamp wont turn on. but the rear cats do a majority of the nox reduction. so no it wont pass somg.
thanx for the info i saved the cats so when smog time comes i'll just have the rewelded in.
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Raiders A's Warriors Sharks
Posts: 2605 | Registered: Jun 2002
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302n/a
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Member # 1465
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posted
quote:
Originally posted by ed650:
is your car much louder now that you only have 2 cats?
it depends on your muffler setup but yeah the sound is quite noticeably louder
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Raiders A's Warriors Sharks
Posts: 2605 | Registered: Jun 2002
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coupedup
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Member # 9987
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it could just be the bulb light for it behind the dash... Sometimes people take them out to trick people when they are selling a car..
Posts: 4406 | From: Ca | Registered: May 2010
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dohc90lx
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Member # 11863
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posted
the bulb on the dash will cycle with the key on and engine off. so make sure you see that to verify the system works. i open track my car alot and what i did was got some flanges from dynomax. they are a bit pricey but bad ass. they are called v band clamps and you weld these flanges into the exahust and it only takes one bolt to remove them. no gaskets and they seal great. dont restrict flow at all too. it takes me more time to put the car on the lift than it does to pull the cats on and off.
Posts: 129 | From: antioch | Registered: Apr 2012
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dohc90lx
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Member # 11863
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quote:
Originally posted by 87 coupe:
Isnt it as longest ur cAts are gone and your 02 censors are still in place light won't turn on
on a 5.0 yes. but his car is a obd 2 vehicle and they have front and rear o2 sensors. the front detect oxygen presence to compute a lean or rich condition. and the rear o2 sensors detect for cats by comparing the signal to the front o2 sensors. you can use electronic mil elimanitors inline with the rear sensors too. they work great.
Posts: 129 | From: antioch | Registered: Apr 2012
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SilverCobra7
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Member # 11975
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I passed smog recently with my Catted X-Pipe! MIL elimenators on the rear sensors.
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'03 SVT Cobra 10th Anniversary SOLD
‘99 Mustang GT
Posts: 34 | From: Fresno, CA | Registered: May 2012
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