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Max Online: 36273 @ 01/23/13 02:34 PM
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#12764697 - 05/22/18 07:30 AM Running with no Catalytic Converter
Holzer Offline
TFF Celebrity

Registered: 11/09/03
Posts: 5158
Loc: 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?
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#12764718 - 05/22/18 07:37 AM Re: Running with no Catalytic Converter [Re: Holzer]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 7081
Loc: texas
Engine will be fine, but you will have the check engine light.

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#12764832 - 05/22/18 09:03 AM Re: Running with no Catalytic Converter [Re: Holzer]
Couples Team Online   content
Angler

Registered: 05/02/13
Posts: 297
Loc: Lindale
Like Redchevy said...Engine will run fine, check engine light will be on, BUT it will not pass a state inspection!

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#12765121 - 05/22/18 12:19 PM Re: Running with no Catalytic Converter [Re: Holzer]
Stump jumper Offline
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Registered: 04/19/04
Posts: 7974
Loc: 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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#12765131 - 05/22/18 12:24 PM Re: Running with no Catalytic Converter [Re: Holzer]
Cast Online   content
TFF Celebrity

Registered: 07/31/12
Posts: 8618
Loc: North Texas - God's Country
Just complete the bypass and get a tuner to adjust around the bypass. It’ll run better.
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#12765329 - 05/22/18 02:31 PM Re: Running with no Catalytic Converter [Re: Cast]
Holzer Offline
TFF Celebrity

Registered: 11/09/03
Posts: 5158
Loc: Boerne, Texas
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
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#12765449 - 05/22/18 03:33 PM Re: Running with no Catalytic Converter [Re: Holzer]
spankyttx Online   content
Extreme Angler

Registered: 01/22/09
Posts: 1235
Loc: 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
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#12766662 - 05/23/18 01:09 PM Re: Running with no Catalytic Converter [Re: Holzer]
MAK747 Online   content
Angler

Registered: 05/08/09
Posts: 456
Loc: Ft Wth
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.


Edited by MAK747 (05/23/18 01:14 PM)

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#12798693 - 06/19/18 10:38 PM Re: Running with no Catalytic Converter [Re: Holzer]
Freeman Clark Offline
Extreme Angler

Registered: 03/18/05
Posts: 1375
Loc: Temple, Texas
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.

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#12800702 - Yesterday at 01:29 PM Re: Running with no Catalytic Converter [Re: Holzer]
Fishin' Nut Online   content
TFF Celebrity

Registered: 03/14/03
Posts: 6671
Loc: Huntsville, AL
Another solution, you could move to Alabama which doesn't do state inspections! grin
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#12801884 - 19 minutes 4 seconds ago Re: Running with no Catalytic Converter [Re: Holzer]
ACAMS Online   content
Extreme Angler

Registered: 03/10/12
Posts: 1192
Loc: 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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