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Driving A Car Without Catalytic Converter - Car Talk - Nairaland

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Driving A Car Without Catalytic Converter by cinzo: 9:41pm On Jun 21, 2011
Hi house, I want to ask what are the advantages and disadvantages of driving a car without a catalytic converter?

Thanks.
Re: Driving A Car Without Catalytic Converter by obojo(m): 11:00pm On Jun 21, 2011
what kind of car? did u drive in a flooded area??
Re: Driving A Car Without Catalytic Converter by cinzo: 11:34pm On Jun 21, 2011
The catalytic converter was blocked and the mechanic had to remove it. Am thinking of driving it like that. What are the advantages and disadvantages?
Re: Driving A Car Without Catalytic Converter by cinzo: 8:30am On Jun 22, 2011
waiting
Re: Driving A Car Without Catalytic Converter by cretin: 9:11am On Jun 22, 2011
1. u wud be polluting the enviroment, [bet as an avg nigerian, u dont care abt the enviroment!]

2. ur car wud be guzzling fuel like mad,

3. there is still a 3rd major reason, but i cant remeber it 4 now.

the CAT costs abt 30 to 60k for most modern cars, try and change it, the extra fuel u wud burn within one yr, as a result of not hving the CAT wud be more than that, trust me!.

2 Likes

Re: Driving A Car Without Catalytic Converter by cinzo: 1:18pm On Jun 22, 2011
1. The Nigerian atmosphere is already polluted.
2. I heard that removal of CAT actually decreases fuel consumption.
Re: Driving A Car Without Catalytic Converter by Nobody: 1:47pm On Jun 22, 2011
cinzo:

1. The Nigerian atmosphere is already polluted.
2. I heard that removal of CAT actually decreases fuel consumption.


Your car will run pretty rough. I would imagine your car was built after 1999, and so will have 2 lambda sensors. one before the catalyst, the other after (downstream). The downstream probe is designed to measure hydrocarbons AFTER the catalyst, which is now missing. Then it sends data back to your ECU, by which a fuel map is created. This will alter the duty cycle of your injectors (duration they remain open) thus regulating fuel use.

With your catalyst missing, your downstream lambda probe (Oxygen sensor) will feed your ECU wrong data, which will try to compensate your fuel trim. It will over fuel like mad. Too much fuel going into your cylinders, over a period of time, will cause engine damage, due to "bore wash". This is whereby excess fuel washes the vital oil lubrication from your cylinder bores, causing premature wear. Your engine will begin burning oil, resulting in high oil consumption, visible as blue smoke. Diluting petrol with oil will result in a very low octane, which couple with a hot operating environment, will cause detonation, which could lead to holes being blown into your piston crowns. Or worse, if severe enough, detonation occurring whilst your piston's on its compression stroke could bend a rod. This could cause a conrod and piston to smash through the side of your engine block.

So I'll ask you - is there any sensible reason to run your modern car without a catalyst? You honestly listen to your "mechanic" who thinks it's a good idea to delete it? Where did you hear removal of a catalyst decreases fuel consumption?

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Re: Driving A Car Without Catalytic Converter by cinzo: 1:50pm On Jun 22, 2011
This post is gone.
Re: Driving A Car Without Catalytic Converter by Nobody: 1:59pm On Jun 22, 2011
Cinzo, your car won't run properly. The only way to delete a catalyst in a modern automobile, and still have it run at its optimum is to alter the ECU map, this will map out the downstream oxygen sensor, so the ECU doesn't need its data. Your ECU is most likely a Denso or Hitachi unit supplied to Toyota. As it's an early model, it can't be re-flashed to delete the downstream oxygen sensor.

You need to obtain a replacement catalyst, unless you're prepared for hear-stopping repair bills.

1 Like

Re: Driving A Car Without Catalytic Converter by cinzo: 3:01pm On Jun 22, 2011
Thanks Sienna, I will tell the mechanic to get me a replacement. Once again I appreciate your input.

I also want to ask if that is the reason the rpm of the engine is high at idle? When you start the car the RPM always hovers at around 1300.
Re: Driving A Car Without Catalytic Converter by Nobody: 3:29pm On Jun 22, 2011
Yes, your unusually high and erratic engine rpm will be related to your catalyst delete.

1 Like

Re: Driving A Car Without Catalytic Converter by cinzo: 3:32pm On Jun 22, 2011
Na wah oh
Re: Driving A Car Without Catalytic Converter by mishooo(m): 3:49pm On Jun 22, 2011
Oga Siena. This is really educating. I have the same problem as my cat is bad and the RPM thing happens but i scanned it and discovered its just that error that keeps on coming up I just decided to overlook it since i dont wanna buy new CAT now. I did not remove my CAT though and its a 2000 VW beetle.

Are the dangers much??
Re: Driving A Car Without Catalytic Converter by Nobody: 4:06pm On Jun 22, 2011
mishooo:

Oga Siena. This is really educating. I have the same problem as my cat is bad and the RPM thing happens but i scanned it and discovered its just that error that keeps on coming up I just decided to overlook it since i dont wanna buy new CAT now. I dikd not remove my CAT though and its a 20g00 VW beetle.

Are the dangers much??

Yes, the risk of engine damage is high. A blocked catalyst will impede the exit of hot exhaust gasses. This will eventually burn out the exhaust valves. Replacement requires cylinder head removal.

That's assuming the cylinder head hasn't suffered damage to the valve seats, and the piston crowns aren't melted.

1 Like

Re: Driving A Car Without Catalytic Converter by cinzo: 4:39pm On Jun 22, 2011
This post is gone.
Re: Driving A Car Without Catalytic Converter by gbonsalifus(m): 11:10am On Jul 01, 2013
Very tech, but I dont fully agree. The function of the second sensor is not to determine the fuel mixture. And the main sensor works independent of the Cat. read better here http://101carsense.blogspot.com/2013/07/popular-but-wrong.html
Siena:

Your car will run pretty rough. I would imagine your car was built after 1999, and so will have 2 lambda sensors. one before the catalyst, the other after (downstream). The downstream probe is designed to measure hydrocarbons AFTER the catalyst, which is now missing. Then it sends data back to your ECU, by which a fuel map is created. This will alter the duty cycle of your injectors (duration they remain open) thus regulating fuel use.

With your catalyst missing, your downstream lambda probe (Oxygen sensor) will feed your ECU wrong data, which will try to compensate your fuel trim. It will over fuel like mad. Too much fuel going into your cylinders, over a period of time, will cause engine damage, due to "bore wash". This is whereby excess fuel washes the vital oil lubrication from your cylinder bores, causing premature wear. Your engine will begin burning oil, resulting in high oil consumption, visible as blue smoke. Diluting petrol with oil will result in a very low octane, which couple with a hot operating environment, will cause detonation, which could lead to holes being blown into your piston crowns. Or worse, if severe enough, detonation occurring whilst your piston's on its compression stroke could bend a rod. This could cause a conrod and piston to smash through the side of your engine block.

So I'll ask you - is there any sensible reason to run your modern car without a catalyst? You honestly listen to your "mechanic" who thinks it's a good idea to delete it? Where did you hear removal of a catalyst decreases fuel consumption?
Re: Driving A Car Without Catalytic Converter by nissparts(m): 12:22pm On Jul 01, 2013
Correct but this thread is over 2 years old dude.
Re: Driving A Car Without Catalytic Converter by Nobody: 9:16am On Mar 21, 2015
Nisparts right this thread is now two years since the last post!
Re: Driving A Car Without Catalytic Converter by mikebuddy(m): 10:38am On Dec 07, 2017


Your car will run pretty rough. I would imagine your car was built after 1999, and so will have 2 lambda sensors. one before the catalyst, the other after (downstream). The downstream probe is designed to measure hydrocarbons AFTER the catalyst, which is now missing. Then it sends data back to your ECU, by which a fuel map is created. This will alter the duty cycle of your injectors (duration they remain open) thus regulating fuel use.

With your catalyst missing, your downstream lambda probe (Oxygen sensor) will feed your ECU wrong data, which will try to compensate your fuel trim. It will over fuel like mad. Too much fuel going into your cylinders, over a period of time, will cause engine damage, due to "bore wash". This is whereby excess fuel washes the vital oil lubrication from your cylinder bores, causing premature wear. Your engine will begin burning oil, resulting in high oil consumption, visible as blue smoke. Diluting petrol with oil will result in a very low octane, which couple with a hot operating environment, will cause detonation, which could lead to holes being blown into your piston crowns. Or worse, if severe enough, detonation occurring whilst your piston's on its compression stroke could bend a rod. This could cause a conrod and piston to smash through the side of your engine block.

So I'll ask you - is there any sensible reason to run your modern car without a catalyst? You honestly listen to your "mechanic" who thinks it's a good idea to delete it? Where did you hear removal of a catalyst decreases fuel consumption?

1] The catalyst does not have any sensor, hence is does not feed data to ECU.
2] Catalyst does not control oxygen, hence it cannot even feed data to oxygen sensor, how does it even feed this data when it has nothing to do with oxygen?
3] It was simply placed there to clean the air coming from engine before it heats the environment, lets not make the duty of this catalyst cumbersome.

3 Likes

Re: Driving A Car Without Catalytic Converter by HenryWilliams(m): 6:53pm On Dec 07, 2017
mikebuddy:


1] The catalyst does not have any sensor, hence is does not feed data to ECU.
2] Catalyst does not control oxygen, hence it cannot even feed data to oxygen sensor, how does it even feed this data when it has nothing to do with oxygen?
3] It was simply placed there to clean the air coming from engine before it heats the environment, lets not make the duty of this catalyst cumbersome.

thank you sir.. So many misinformed Negroes here
Re: Driving A Car Without Catalytic Converter by Meetleader: 2:19pm On Dec 19, 2017
Nice info....


I'm experiencing same problem with my car

Guzzling so much fuel..

Engine sound is awkward...

Vibration is abnormal
Re: Driving A Car Without Catalytic Converter by Coldplay007(f): 9:14pm On Dec 19, 2017
Wait oo.. does this mean Sienna used to Bobo us all those years ago.. grin
Cos all he wrote up there is just techie bobo.. grin

2 Likes

Re: Driving A Car Without Catalytic Converter by Inception(m): 9:19pm On Dec 19, 2017
Coldplay007:
Wait oo.. does this mean Sienna used to Bobo us all those years ago.. grin
Cos all he wrote up there is just techie bobo.. grin

Una Neva still free this guy?

1 Like

Re: Driving A Car Without Catalytic Converter by denice1: 9:39pm On Dec 19, 2017
mikebuddy:


1] The catalyst does not have any sensor, hence is does not feed data to ECU.
2] Catalyst does not control oxygen, hence it cannot even feed data to oxygen sensor, how does it even feed this data when it has nothing to do with oxygen?
3] It was simply placed there to clean the air coming from engine before it heats the environment, lets not make the duty of this catalyst cumbersome.

I disagree with you sir on no. 2.
Re: Driving A Car Without Catalytic Converter by erico2k2(m): 9:01pm On Dec 22, 2017
mikebuddy:


1] The catalyst does not have any sensor, hence is does not feed data to ECU.
2] Catalyst does not control oxygen, hence it cannot even feed data to oxygen sensor, how does it even feed this data when it has nothing to do with oxygen?
3] It was simply placed there to clean the air coming from engine before it heats the environment, lets not make the duty of this catalyst cumbersome.
Etremly wrong,we should be careful when we condem peoples profetional inpute.
1 The cat con does not have any sensore true but there is a sensor b4 it and a sensor after it(Up and Down streams) do you think the fumes that goes inside is the same as the fumes that comes out? dont you think both O2 sensors will have different readdings?
2 It does control the oxygen as it purifies the Nox gases that comes out of it, the sensor at this stage feeds data back to the ECU
3, this is true, however science has gone beyound this, No cat con means your car will fail the emission test.
So Mr Seana was right 110%

1 Like

Re: Driving A Car Without Catalytic Converter by erico2k2(m): 9:02pm On Dec 22, 2017
HenryWilliams:


thank you sir.. So many misinformed Negroes here
No to be honest that guy you quoted is misinformed.These are the people who will reamove thier Cat and Thermostats.
Re: Driving A Car Without Catalytic Converter by GAZZUZZ(m): 10:46pm On Dec 23, 2017
calling all Demeanors......

Thread revived, I repeat thread revived.

bravolad, mayor2013, Inception, diportivo, chukel, nurey, obekediamondfuto, cmoney2222, Readonee35L


1 Like

Re: Driving A Car Without Catalytic Converter by nurey(m): 7:05am On Dec 24, 2017
Removing the catalyst will allow harmful gases into the atmosphere. But after removing the catalyst the oxygen sensor would throw catalyst code and you will probably not face increase in fuel consumption rather an improvement.

To delete the catalyst code, you need a defouler to attach to the oxygen sensors to fool it from throwing code, the defouler helps reduce the amount of gases the oxygen sensor is exposed to.

1 Like

Re: Driving A Car Without Catalytic Converter by Specialist900(m): 8:34am On Dec 24, 2017
GAZZUZZ:
calling all Demeanors......

Thread revived, I repeat thread revived.

bravolad, mayor2013, Inception, diportivo, chukel, nurey, obekediamondfuto, cmoney2222, Readonee35L




grin
Re: Driving A Car Without Catalytic Converter by captainking(m): 10:42am On Dec 24, 2017
GAZZUZZ:
calling all Demeanors......

Thread revived, I repeat thread revived.

bravolad, mayor2013, Inception, diportivo, chukel, nurey, obekediamondfuto, cmoney2222, Readonee35L




Is honmusa/autologic not part of them?? grin cheesy
Re: Driving A Car Without Catalytic Converter by GAZZUZZ(m): 11:08am On Dec 24, 2017
captainking:

Is honmusa/autologic not part of them?? grin cheesy


The young man is on a solo mission somewhere in the middle east.... grin

1 Like

Re: Driving A Car Without Catalytic Converter by obekediamondfuto(m): 1:05pm On Dec 24, 2017
GAZZUZZ:
calling all Demeanors......

Thread revived, I repeat thread revived.

bravolad, mayor2013, Inception, diportivo, chukel, nurey, obekediamondfuto, cmoney2222, Readonee35L





the boss,, I sight u.
as for me and my household...... the cat delete will increase fuel consumption in an 03 4cyl Camry, I've been there and done that. I stick with siena on this. except you can trick the o2 sensors to work with the new no-cat con config(defouler),the downstream or post cat o2 sensor will send signals to the ecu which will also factor in the new free flow of air. ECU is just a GIGO computer, it will definitely try to compensate for the perceived excess air flow(lean) and command more fuel through the injectors.

like I said peeps, 03 Camry 4cyl


but oga boss what's ur take on this issue

fortunately I stumbled into this just now
https://www.bimmerforums.com/forum/showthread.php?1519895-Do-post-cat-o2-sensors-affect-fuel-trim

this issue has been an issue of deliberation for so many auto experts But this is the truth up there!!!

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