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Jan 23rd, 2013
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Running with no Catalytic Converter #12764697
05/22/18 12:30 PM
05/22/18 12:30 PM
Joined: Nov 2003
Posts: 5,239
Boerne, Texas
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Holzer Offline OP
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Holzer  Offline OP
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Boerne, Texas
Let's say some thug cuts off 1 of the 2 catalytic converters you have on your truck.
Instead of replacing the converter you just add a straight pipe.

Running the truck afterwards, check engine light is on and the code you get is basically for a faulty convert/no converter. When I asked others about this scenario, I have been told:

- The engine will continue to run just fine. But you'll have the check engine light to deal with come inspection time.

- The engine will run a little leaner. Fuel mileage will drop but nothing really noticeable.

So what's the bottom line as far as how your engine is going to run, what to expect, Good/Bad to do, not good long term, converts are just a B.S. emissions part and not needed, etc.? Your thoughts?


Holzer
My pic is gone frown
Re: Running with no Catalytic Converter [Re: Holzer] #12764718
05/22/18 12:37 PM
05/22/18 12:37 PM
Joined: Jan 2005
Posts: 7,191
texas
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redchevy Offline
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Engine will be fine, but you will have the check engine light.

Re: Running with no Catalytic Converter [Re: Holzer] #12764832
05/22/18 02:03 PM
05/22/18 02:03 PM
Joined: May 2013
Posts: 310
Lindale
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MarcM64 Offline
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Like Redchevy said...Engine will run fine, check engine light will be on, BUT it will not pass a state inspection!

Re: Running with no Catalytic Converter [Re: Holzer] #12765121
05/22/18 05:19 PM
05/22/18 05:19 PM
Joined: Apr 2004
Posts: 8,345
Rockwall
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Stump jumper Online content
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Rockwall
Not sure if no cats will affect the back pressure. If it does you might lose a little low end torque.


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Re: Running with no Catalytic Converter [Re: Holzer] #12765131
05/22/18 05:24 PM
05/22/18 05:24 PM
Joined: Jul 2012
Posts: 9,861
North Texas - God's Country
Cast Online content
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Cast  Online Content
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North Texas - God's Country
Just complete the bypass and get a tuner to adjust around the bypass. It’ll run better.


Cast




I have a short attention spa
Re: Running with no Catalytic Converter [Re: Cast] #12765329
05/22/18 07:31 PM
05/22/18 07:31 PM
Joined: Nov 2003
Posts: 5,239
Boerne, Texas
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Holzer Offline OP
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Holzer  Offline OP
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Originally Posted By: Cast
Just complete the bypass and get a tuner to adjust around the bypass. It’ll run better.


Thought about that as well.



OK, sounds like all should be fine.
Thanks


Holzer
My pic is gone frown
Re: Running with no Catalytic Converter [Re: Holzer] #12765449
05/22/18 08:33 PM
05/22/18 08:33 PM
Joined: Jan 2009
Posts: 1,272
Denton Tx.
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spankyttx Online content
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spankyttx  Online Content
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Posts: 1,272
Denton Tx.
the front o2 sensor monitors exhaust gases out of the engine for lean or rich conditions, the rear o2 sensor monitors emissions out of the cat. so fuel mileage, so to speak, will be from the front o2. so no tuning or tuner needed


LI-SI-WI-NWI
Re: Running with no Catalytic Converter [Re: Holzer] #12766662
05/23/18 06:09 PM
05/23/18 06:09 PM
Joined: May 2009
Posts: 508
Ft Wth
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MAK747 Offline
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If it was stolen by some low-life thieving scum mad Then call police and get a report, turn it into your insurance and then have it replaced at the dealership. You're out the deductible but you wont have to worry about inspection issues, warranty issues (if still under warranty) or depreciated value when you decide to sell it or trade it in. Tampering with the emissions system by trying to bypass it or fool the ECM/ECU may come back to bite you in the future.

Last edited by MAK747; 05/23/18 06:14 PM.
Re: Running with no Catalytic Converter [Re: Holzer] #12798693
06/20/18 03:38 AM
06/20/18 03:38 AM
Joined: Mar 2005
Posts: 1,377
Temple, Texas
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Freeman Clark Offline
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You a breaking the law anytime you change are tamper with the emission system.A lot of the guys running coal burners are tampering with there emission systems. Will cost them when they get caught.

Re: Running with no Catalytic Converter [Re: Holzer] #12800702
06/21/18 06:29 PM
06/21/18 06:29 PM
Joined: Mar 2003
Posts: 6,950
Huntsville, AL
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Fishin' Nut Offline
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Another solution, you could move to Alabama which doesn't do state inspections! grin




Kirk Long (Kikr) March 4, 1959 - June 19, 2009
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Re: Running with no Catalytic Converter [Re: Holzer] #12801884
06/22/18 06:49 PM
06/22/18 06:49 PM
Joined: Mar 2012
Posts: 1,258
Palestine
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ACAMS Offline
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Palestine
What vehicle is this .... most don't know the cat has been gutted/removed unless the o2 sensor is throwing the code.

What I am getting at is that somebody with HP Tuners or EFI Live can turn it off and even tune for better performance and mileage.


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Re: Running with no Catalytic Converter [Re: Holzer] #12801927
06/22/18 07:11 PM
06/22/18 07:11 PM
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hillyryan Offline
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Have any of you done business with a Colby Lehman?

Re: Running with no Catalytic Converter [Re: Holzer] #12803083
06/23/18 10:06 PM
06/23/18 10:06 PM
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Posts: 1,570
Kaufman
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psycho0819 Offline
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Kaufman
Look up " exhaust test pipe", then get a tuner to do the work around, or not. If flanged and bolted in, you can even swap them out come emission time and have the best of both worlds.


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