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1968/69 td trooper! will an extra cat'converter reduce emissions further? also, do cats'reduce the nitrogen?

They are going to put us oilers off the road especially us older ones

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No an extra cat converter will achieve nothing
nitrogen is an inert gas and doesn't burn so it will read as nothing
for example when nitrous oxide is used to boost power in an engine , it is the extra oxygen molecule that is release for combustion and the heated and expanding nitrogen gas that does the pushing down effect on the piston

Posted on Apr 25, 2017

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Precat on nissan altima is giving me a code p0420 and want to add a header


code p 0420 refers to cat converter system bank 1---efficiency below threshold ( cat converter cracked internally and not lighting up)=== causes ---cat converter---wiring -- heated oxygen sensor (HO2S ) 2
unless a cat converter has failed and is blocking the exhaust system they do not increase/ decrease back pressure
they do not put stuff back in the motor to damage the engine as the exhaust gas flow blows the bits out the exhaust pipe
gutting the cat converter is a waste of money as it is needed for the ECM to set the correct air/fuel mixture for optimum economy and performance
It works like this, the ECM sets a mixture that is burnt in the combustion process--the first sensor ( heated oxygen sensor reads the exhaust gas emissions and reports to the ECM which then adjusts the mixture to preset parameters or fuel trim The cat converter burns the emissions and the final oxygen sensor (O2) reads the end result and reports to the ECM as a final fuel trim
the cat converter is placed as close to the engine as possible so that they get hot enough to burn ( and they do burn at a very high temperature) so putting one further back in the system would be a total waste of money as it would eventually carbon up and restrict gas flow
so this is how it stands
1-- failing cats do not damage engines-- but will affect the back pressure by blocking the exhaust pipe
2--- cats are essential part of the economy/power process
3--- the car is designed for maximum power and performance with the cat in the right place ( not further along the system
4-- a cars exhaust system is designed and tested by qualified engineers in controlled conditions to get optimum back pressure requirements for the fuel trim set in the ECM
5 ---listening to "mates" about modifying the system will cause you problems with vehicle inspectors and that will be a cost on your wasted money
7-- here is a tip about back pressure
back pressure is used to get the low pressure area caused by the expulsion of the hot gas out of the end of the pipe to return to the exhaust valve so that when the valve opens there is a vacuum that sucks the burnt gas out of the cylinder and sucks more fuel mixture in --- read books on exhaust pipe and header tuning and you will get the message

Aug 17, 2016 | Nissan Cars & Trucks

3 Answers

Does a Catalytic converter effect idle and emissions?


yes it does effect emissions and the decisions from o2 sensors are relayed to the computer which can change idle

May 14, 2014 | 2006 Ford Fusion

1 Answer

California emission


where did you buy the cat converter from. most parts stores have documentation with the part stating if it is CA emissions. if you know the manufacturer and part number you can always go to their website. it should tell you there

May 24, 2013 | Chevrolet Malibu Cars & Trucks

1 Answer

Sometimes hard to start, then when driving the car will lurch and wants to die


its your catalytic converter (colloquially, "cat" or "catcon") is a vehicle emissions control device which converts toxic byproducts of combustion in the exhaust of an internal combustion engine to less toxic substances by way of catalysed chemical reactions. The specific reactions vary with the type of catalyst installed. Most present-day vehicles that run on gasoline are fitted with a "three way" converter, so named because it converts the three main pollutants in automobile exhaust: an oxidizing reaction converts carbon monoxide (CO) and unburned hydrocarbons (HC) to CO2 and water vapour, and a reduction reaction converts oxides of nitrogen (NOx) to produce CO2, nitrogen (N2), and water (H2O).[1] The first widespread introduction of catalytic converters was in the United States market, where 1975 model year gasoline-powered automobiles were so equipped to comply with tightening U.S. Environmental Protection Agency regulations on automobile exhaust emissions.[2][3][4][5] These were "two-way" converters which combined carbon monoxide (CO) and unburned hydrocarbons (HC) to produce carbon dioxide (CO2) and water (H2O). Two-way catalytic converters of this type are now considered obsolete, having been supplanted except on lean burn engines[citation needed] by "three-way" converters which also reduce oxides of nitrogen (NOx).[2]
Catalytic converters are still most commonly used in exhaust systems in automobiles, but are also used on generator sets, forklifts, mining equipment, trucks, buses, locomotives, motorcycles, airplanes and other engine-fitted devices. They are also used on some wood stoves to control emissions.[6] This is usually in response to government regulation, either through direct environmental regulation or through health and safety regulations.
Catalytic oxidization is also used, but for the purpose of safe, flameless generation of heat rather than destruction of pollutants, in catalytic heaters.

Oct 15, 2012 | 1995 Buick LeSabre

1 Answer

I failed the NOX portion of the emissions test app.standard is 4.00 i ran a 6.32 . I had a cat conv. put on two years ago. I just noticed my temp. gauge not moving at all could this be the problem? Do you...


Engine not at operating temperature--Cold Converter,Thermostat Stuck Open
Malfunctioning Mixture Control--O2 Sensor reading lean all the time.
Coolant Temp Sensor high resistance or open circuit
Bad Converter

EGR Valve--most likely cause

Nov 11, 2010 | 1993 Isuzu Trooper

2 Answers

P0420 code on my 2003 chevy s10


please go to the provide link for diagnosis of this code,but the bottom line here is the catalytic converter may be worn out

http://www.p0420.com/

Aug 06, 2010 | 2003 Chevrolet S-10

2 Answers

What does a catalytic converter do.


remove HC,CO and oxidies of nitrogen (NOx ).

Mar 24, 2010 | 1991 Honda Accord

4 Answers

Check Engine Light!


Yes your cat will cause it to come on...
There is a sensor before the cat that measures the emissions from your headers, then there's another sensor after your cat that measures the emissions after it passes through your cat. a faulty cat will cause the sensor to register differently triggering the light. Driving with a broken cat can cause serious damage to your engine as it also alters the backpressure

Sep 04, 2009 | 2003 Chevrolet Blazer

1 Answer

Check engine light due to Catalytic converter


Without knowing the specific code, I will assume it relates to an inefficient catalytic converter. At this mileage it could very well mean that the catalytic converter is failing to do it's job and needs to be replaced. The computer sets this code when it sees a signal from the rear O2 sensor start to change in time with the front O2 sensor. It should not. If the cat is working, The rear O2 sensor should have a stable output as the cat is supposed to be removing all the oxygen from the exhaust. Sometimes this code will set if the spark plugs or the engine's state of tune has deteriorated and is producing more emission than the cat can handle, the rear O2 sees the overflow and assumes the cat is bad.
At your present mileage, I would strongly suggest changing the spark plugs if they have not been done in the last 20,000 mi. Have the light reset and drive it to see if the code returns. If it does, replace the catalytic converter. I suspect that you do need a cat, but I view the spark plugs as maintenance, and I wouldn't want to put a brand new cat in without the assurance that my old plugs were not going to damage the new one.
Hope this helps,
Dave

May 18, 2009 | 1996 Isuzu Trooper

1 Answer

Bmw 3 series 318ti 2002 exhaust emission valves deteriated how much to repair


You will get a reduced catalyst efficiency reading after the cat has started failing. Be careful of using an aftermarket cat. BMW cat converters are made for longer life, which is why they are so expensive. I would look online to see if any dealers are selling on ebay. The factory cat comes with the front exhaust portion and is not very hard to install. It is all bolt on.

Jun 25, 2008 | 1999 BMW 318 ti

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