Cat Delete?
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From: Vegas Baby!
Cat Delete?
So my Cat went out on my 2000 V10, my fuel pump was also replaced as it was not producing enough PSI. The shop straight piped the exhaust until the Cat comes in on Wednesday and now I am wondering if I should just forego the cat install. Truck is registered in Florida so no need for smog required here in NV. So now I am considering just leaving the Cat out. Truck has 158K. Any thoughts? Is it a bad idea to delete the cat, will that affect my spark plugs? Mechanic said it would foul out the plugs faster and that the O2 sensors might not work the same....is this all a bunch of bull?
-Jonathan
-Jonathan
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Joined: Jan 2014
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There is no benefit to leaving it deleted. Multiple dyno tests on a large variety of vehicles have shown a whopping maximum of 5.3rwhp gained by running no cat (between stock to substantially modified street legal vehicles). I deleted the cats on my turbo LS2 and picked up all of 11.9rwhp and 8.7rwtq, not worth it IMHO and that was on a 638.1rwhp car.
It can cause issues with the O2 sensors, as they have nothing to read post-cat. A decent high-flow is a solid replacement choice.
It can cause issues with the O2 sensors, as they have nothing to read post-cat. A decent high-flow is a solid replacement choice.
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Joined: Apr 2011
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From: Northern California
Without the cat the exhaust will flow unrestricted past the O2 sensor possibly causing it to read a value different then what the computer is expecting, if it reads a lean condition it will add more fuel, either creating slightly more power or it will just run rich and foul the plugs as the mechanic eluded to. That is the simple answer but that is the jist of it. In reality it work just fine, or it might throw codes or just run rich. Depends on the programming of which I am no expert.
Has your check engine light come on yet ? That could be your first clue what is going on. You could also pull a plug and check it after doing a "plug run"
Has your check engine light come on yet ? That could be your first clue what is going on. You could also pull a plug and check it after doing a "plug run"
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From: Vegas Baby!
Thanks for the replies
The truck hasn't thrown any codes, and even when the truck was stunted with the bad fuel pump and cat it wasn't throwing a code or a check engine light.I am not sure if it's a California emissions truck or about the O2 sensor.
Last edited by Ardiemus; Aug 23, 2015 at 11:58 PM. Reason: Change
Laughing Gas
Joined: Nov 2014
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From: Idaho
What's it sound like without the cat on it with the stock exhaust? Very different?
It's a pretty quick check to see if you have an O2 sensor post cat. It is threaded into the top of the exhaust system after the cat. I can't remember exactly how far back, but it is between the cat and the muffler. Even if you do have a post cat O2 sensor, I think you can get tunes to disable it, or trick it.
Judging by the size of the stock Cat, I'd say it is already a high flow Cat, if that even really exists.
I don't believe there are any real benefits to running without a cat. Might work well in conjunction with a high flow exhaust and add a little extra sound volume to your rig. As much as the anti emissions teams think that cats are the quickest way to get back "robbed" HP from a vehicle, they do a great job in burning off that extra bit of fuel that is left over. Without them, I can't imagine anyone traveling behind you would be very happy with their air quality.
It's a pretty quick check to see if you have an O2 sensor post cat. It is threaded into the top of the exhaust system after the cat. I can't remember exactly how far back, but it is between the cat and the muffler. Even if you do have a post cat O2 sensor, I think you can get tunes to disable it, or trick it.
Judging by the size of the stock Cat, I'd say it is already a high flow Cat, if that even really exists.
I don't believe there are any real benefits to running without a cat. Might work well in conjunction with a high flow exhaust and add a little extra sound volume to your rig. As much as the anti emissions teams think that cats are the quickest way to get back "robbed" HP from a vehicle, they do a great job in burning off that extra bit of fuel that is left over. Without them, I can't imagine anyone traveling behind you would be very happy with their air quality.
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From: Colorado
If it is a california model it will have a sticker under the hood stating it is obd2 compliant.
The cali models have a 3rd o2 sensor behind the cat, it checks if the ca is working. All other models won't have the 3rd sensor and won't care if there is a cat.
Some people have also stated bad smells when there was no cat.
The cali models have a 3rd o2 sensor behind the cat, it checks if the ca is working. All other models won't have the 3rd sensor and won't care if there is a cat.
Some people have also stated bad smells when there was no cat.
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From: Media PA
If it is a california model it will have a sticker under the hood stating it is obd2 compliant.
The cali models have a 3rd o2 sensor behind the cat, it checks if the ca is working. All other models won't have the 3rd sensor and won't care if there is a cat.
Some people have also stated bad smells when there was no cat.
The cali models have a 3rd o2 sensor behind the cat, it checks if the ca is working. All other models won't have the 3rd sensor and won't care if there is a cat.
Some people have also stated bad smells when there was no cat.
Cali truck SHOULD have a sticker under the hood, mine doesn't and that is my 3rd O2 sensor pictured above. Caused me some aggravation when I had to replace the fuel pump, the Cali pump version is different also, has a vapor pressure sensor. Some folks also say that Cali trucks have EGR valves, but I think that has been proven false on later year trucks anyway, my '05 does NOT have the EGR.
My EX is originally an Army Corps of Engineers vehicle, not sure if the Federal Fleet build changes anything.
And just for the Tipsy Unicorn.....
No Cali emission sticker.
Cali fuel pump and vapor pressure sensor rear, regular pump without sensor front.
Driver's side exhaust manifold, no EGR valve, solid round boss where it would be.
Laughing Gas
Joined: Nov 2014
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From: Idaho
WOOOO! Pictures!
Mine has a 3rd O2 sensor and no EGR. I'll check and see if I have a Cali sticker.
Mine has a 3rd O2 sensor and no EGR. I'll check and see if I have a Cali sticker.
Cali truck SHOULD have a sticker under the hood, mine doesn't and that is my 3rd O2 sensor pictured above. Caused me some aggravation when I had to replace the fuel pump, the Cali pump version is different also, has a vapor pressure sensor. Some folks also say that Cali trucks have EGR valves, but I think that has been proven false on later year trucks anyway, my '05 does NOT have the EGR.
My EX is originally an Army Corps of Engineers vehicle, not sure if the Federal Fleet build changes anything.
And just for the Tipsy Unicorn.....
My EX is originally an Army Corps of Engineers vehicle, not sure if the Federal Fleet build changes anything.
And just for the Tipsy Unicorn.....