Question about 2005 Suzuki Esteem

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High CO emission levels + Fuel Efficiency?

Dear friends,

I am in New Delhi, India and have a Maruti Esteem 2002 model.

I have got the Pollution Check done and it reports that the CO level is high though within Permissible limits( 0.45 % per volume) . How does one get this fixed.

Part 2 of the question is I get a mileage of 15 KMPL . Is this ok for Delhi traffic conditions of start-stop-start or do I need to do something else too.

Look forward for your suggestions as I do not want to add smoke to the world as also see my earnings smoked out.

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What does it mean when it says co


CO? That means Carbon Monoxide - it's a rather toxic and poisonous gas emitted from the exhaust system.

When they check emissions on cars CO is one of the gases they measure. If the level is too high .. your car fails the emissions test. I believe in the USA the emissions test is known as the 'smog test'?

If you have a problem with excess CO emissions on a car the cause is often an incorrect fuel/air mixture or a faulty sensor called the lambda/oxygen sensor in the exhaust system

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Maruti esteem


check your ignition system and coolant temp sensor

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Check engine lite on with PO421 code


P0421 = Catalyst System Efficiency below Threshold(Bank1) The catalyst's efficiency is demonstrated by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module (PCM) compares the output signals of the front and rear oxygen sensors to determine whether the output of the rear sensor is beginning to match the output of the front oxygen sensor. Air/fuel mixture compensation keeps the frequency of the front oxygen sensor high due to the changes from rich-to-lean combustion. The catalyst causes the rear oxygen sensor to have a lower frequency. As the catalyst wears, the rear oxygen sensor's signal trace begins to match the front oxygen sensor's signal trace. That is because the catalyst becomes saturated with oxygen and cannot use the oxygen to convert hydrocarbon and CO into H???O and CO??? with the same efficiency as when it was new. A completely worn catalyst shows a 100% match between the frequency of the front and rear sensors.

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1 Answer

My 91 explorer wont pass emissions, Co levels too high and hc levels. Are high as well


have your air/fuel (a/f) ratio checked. high CO level means you have a rich a/f mixture.

rich a/f mixture means there is too much fuel compared to air. this is bad for fuel economy.
lean a/f mixture means there is too much air compared to fuel. this needs immediate attention since this might lead to over compression in the combustion chamber, which develops to total internal engine failure.

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I have a old 5 seeter maruti van . when loaded to


The more load you add, the more fuel your engine requires. Check your fuel filter for dirt and replace if not almost new.

Apr 06, 2010 | 1995 Suzuki Esteem

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What is the emission controlls evarorative system


Emission control systems have been incorporated into automobiles to prevent pollution by limiting the amount of partially burned and evaporated gases into the atmosphere. These systems have been efficient in reducing the pollution caused by automobiles to a large extent. Automobiles were first manufactured with exhaust emissions control systems in 1966. Since then technology has undergone several changes that has increased the number of cars which use this technology. The emission released is calculated by quantity released per distance traveled. The types of emissions are tailpipe emissions, life cycle emissions and evaporative fuel emissions.
Catalytic Converter
The catalytic converter was developed in the early 70's when severe air pollution was emanate, but wasn't made mandatory by the US government until 1976. The catalytic converter or "cat" for short is one of your vehicles main emission control devices. The name was derived from the operation the catalytic converter performs, it takes a catalyst and converts the unburned gases to burned gases, "catalytic converter".
EGR Valve
EGR valves are used is to lower KNOX (NO2) gases which occur when the combustion chamber when temperature reaches over 3,500 degrees Fahrenheit. KNOX gases have proven to cause brain damage and have been mandatory on most vehicles since 1976. An EGR (exhaust gas re-circulation) this valve controls exhaust gases to enter the intake manifold and flow into the combustion chamber at certain times in the operation of the vehicle. To test your EGR valve remove the vacuum line that is connected to the valve, apply vacuum using a vacuum pump to the valve while the engine is running. If the engine stalls the EGR system is working, if not, the EGR valve may have failed.
Tailpipe emissions are released as bi-products of spent fuel that is combusted inside the cylinders of the engine. These omitted gases consist of carbon monoxide, hydrocarbons, carbon dioxide and nitrogen oxides. To control tailpipe emissions measures have been taken to increasing engine efficiency. This efficiency involves technologies such as lightweight vehicle design, regenerative braking, decreased rolling resistance, increased ignition voltage, minimizing air resistance and improving power train efficiency.


Lifecycle emissions are products which are released during the manufacturing, maintenance and disposal of the vehicle. The products include volatile solvents such as auto paint and lubricants, manufacturing plant power waste, oil filter and oil changes, heavy metals, tires, landfills, etc. These kinds of emissions are responsible for creating urban smog which consists of heavy molecular gases which pollute our environment.

Temperature change can result in the evaporation of fuel in the tank because of the development of pressure, this is known as gas tank venting. Recently fuel systems have been equipped with a closed system called EVAP, this allows the vapor to be stored in a charcoal canister until it can condense into a liquid and then returned to the fuel tank.

Another emission control system known as the air injection reactor or AIR, oxygen is injected in the exhaust manifold. This system decreases the bi-products of incomplete fuel consumption.


If the emission control system malfunctions the "check engine" light will illuminate. Scan the PCM for trouble codes, repair the problem, then clear codes to re-test system. Most automobile's have an emission system information label under the hood, or consult a repair manual.

The emission system performs regular test while the car is in use called a "test cycle". Tailpipe emission are measured in parts per million or PPM. Presently, the limit for evaporated gases is two grams of HC per hour, which is about one liter per month. At first, the idle test, which was a two-speed test was conducted in the 1980s. Then it was substituted by the dynamometer test in the late 90's, in the accelerated simulated mode or ASM three gases are tested. Various states and countries have developed unique laws about pollution testing of vehicles.

Good luck, and remember rated this help.

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3 Answers

Failed emissions test


Hi Don,

First, thank you for asking me for my input on this. It just so happens, that I used to own a Ford ranger that had the same engine as yours. It was a 1990, but there are few changes to these model years.

Anyway, there is only one reason that your HC levels would be high. Your engine has WAY too much unburned fuel in the exhaust. The same reason applies to high CO levels. Too much fuel and/or not enough air.

Below is a link that you may find very helpful. It explains exactly what we are talking about here and also lists some of the possible causes.

EMISSIONS ANALYSIS

Incidently, when I had the same emissions failure on my truck, replacing the air filter and replacing a failed MAP sensor fixed it. - I did NOT have to replace the catalytic converter. If the numbers are as high as you listed above, you will only destroy a new converter anyway because there is obviously not enough oxygen in your exhaust system for the catalyst to function properly. Those numbers are nearly DOUBLE the allowable maximum. If the engine is running correctly and the catalyst is good, your numbers will be WAY BELOW those maximum numbers.

Please understand that I am NOT telling you to replace your MAP sensor without proper diagnosis. There are many possible causes here. Please click the link above and read the article. It will help you to understand what is going on here.

Jun 03, 2009 | 1989 Ford Ranger

4 Answers

Power steering in Maruti Esteem Car


1) I Want Maruti Esteem All spare parts price & information.
2) Spare parts supplier address.
3) Machine part's detail's.

Aug 01, 2008 | 2005 Suzuki Esteem

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