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Driving A Car Without Catalytic Converter - Car Talk - Nairaland

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How To Remove Check Engine Light Originating From Bad/absent Catalytic Converter / Stollen Catalytic Converter / Is it Alright To Drive A Newly-bought Car Without A License Plate In Nigeria? (1) (2) (3) (4)

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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!.

1 Like

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 Siena(m): 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?
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 Siena(m): 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.
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 Siena(m): 3:29pm On Jun 22, 2011
Yes, your unusually high and erratic engine rpm will be related to your catalyst delete.
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 Siena(m): 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.
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.

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