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Does a Catalytic converter effect idle and emissions?

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  • Ford Master
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Yes it is part of emissions ---if clogging will choke motor and can cause stalling to a no start --also the cat converter has o2 sensors before and after which read the exhaust gasses and adjust the vehicles performance as well as other sensors but check with ford dealer cat converters have a different [their is a difference with the warranty] longer than standard warranty dont know what your warranty is [extended -under 100,000 miles,etc] but call and check with a dealer about your cat converter .

Posted on May 14, 2014

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    _-__-___-_ May 14, 2014

    in and of it self, it (CAT) does not effect idle, unless it leaks air. The cat does not control the front oxygen sensors , unless cracked "breached" you question opens up, all possible failure modes of just the cat, my answer is just the cat, not the exhaust pipes, not the gaskets ,just the cat, if the cat is not cracked, the car will run perfeclty infact you can gut a cat , inside and it will run prefectly (on very old cars this can kill the EGR) but not this car.. (emissions is a total other answer and easy) Are you just curious , or does your engine run bad? if it runs bad why not post the symptoms and ask for help and not guess. The idle can be bad for a vast number if reasons. and is not effect to list all 50 ways, we works symptoms and do tests to stay on track and not waste time, or parts.

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  • Ford Master
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The CAT is 100% for emissions and nothing else, beside catching tall weeds on fire and making stinky smells. .
why not post symptom and stop guessing>?
The modern three way CAT reduces, 3 types of toxic gases.
thus the name. (ill not list them an bore you)

IDLE, yes and no.! (fact)
yes, if the cat got red hot and melted, yes, it clogs the exhaust up and engine idle drops and or stalls. that 06 for CEL lamp flashing
means, you are burning up that $1000 CAT. RTM the operators guide tells you that and what to do.........
No, a good cat NEVER effects idle ever.

my wild guess, is your idle has issues.
like:
1: idles too low. not 800 spec. hot.
2: idles to high.
3: idle regulation is non existent.
4: or is a cold idle issue, I sure can't guess can I.

The ECU controls idle at all times, if it can't that is #1 top clue.
why not post the symptoms... why not?

Posted on May 14, 2014

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  • Ford Master
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Yes it does effect emissions and the decisions from o2 sensors are relayed to the computer which can change idle

Posted on May 14, 2014

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Location of code p1137 on 01 alero


catalytic converter .
In order to control emissions, a catalytic converter converts any harmful exhaust emissions into harmless water vapor and carbon dioxide.
The powertrain control module (PCM) has the capability to monitor this process by using a rear-heated oxygen sensor (HO2S 2). The HO2S 2 , located in the exhaust stream past the catalytic converter, produces an output signal which indicates the storage capacity of the catalyst. This in turn indicates the catalysts ability to convert the exhaust emissions effectively. If the catalyst is functioning properly, the HO2S 2 signal will be far less active than the signal produced by the front oxygen sensor (O2S 1).

Feb 12, 2017 | 2001 Oldsmobile Alero

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What is the effect of fouled or failing catalytic converters?


Mainly increased emissions and a failure at the smog test. There isn't much effect on drivability.
.

Dec 09, 2016 | Cars & Trucks

1 Answer

2003 ford focus catalytic converter location


SECTION 309-00: Exhaust System 2003 Focus Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 01/24/2003 Exhaust System adobe.gif Printable View (214 KB) Vehicles with 2.0L Zetec-E enginee0008758.gif
Item Part Number Description 1 - Bracket 2 - Gasket 3 - Catalytic converter 4 - Bracket 5 - Gasket 6 - Front muffler 7 - Rear muffler 8 - Hanger 9 - Flexible pipe

Vehicles with 2.0L SPI enginee0010349.gif
Item Part Number Description 1 - Gasket 2 - Catalytic converter 3 - Bracket 4 - Gasket 5 - Front muffler 6 - Rear muffler 7 - Hanger 8 - Bracket 9 - Flexible pipe

Vehicles with 2.3L PZEV Enginea0072697.gif
Item Part Number Description 1 5G232 Catalytic converter 2 5K222 Mounting bracket 3 5K282 Head shield 4 9451 Gasket 5 5A262 Insulator 6 5E292 Converter and muffler assembly 7 9448 Gasket 8 5G203 Flex Pipe NOTE: The exhaust systems shown in this section are production systems.
The exhaust systems are of a two-piece construction for production and five-piece construction for service.
Catalytic Converter
The catalytic converter fitted to the Focus range resembles a small muffler. Because of the high temperatures at which the catalytic converter operates, the vehicle body areas around the catalytic converter are protected by heat shields. The catalytic converter controls three emissions; Hydro carbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx).
Catalyst deactivation due to poisoning
Sulphur (S) in the fuel can cause deactivation of the catalyst.
Lead (Pb) in fuel can cause a severe deactivation at levels above 5 mg per liter of fuel. It is therefore essential that vehicles with catalytic converters always operate on unleaded fuel.
Zinc (Zn) and phosphorus (P) present in some oils, can cause deactivation if oil consumption is high.
The effect of sulphur is felt most if it is released from the catalytic converter as hydrogen sulphide (H2S). This has an unpleasant odor similar to rotten eggs. Changing the fuel manufacturer may help in reducing this phenomena.
To minimize H2S emissions, it is essential that the idle CO level is within specification and that the engine emission system is functioning correctly. For additional information, refer to Section 303-08A or Section 303-08B.
ani_caut.gif CAUTION: If temperatures exceeding 900°C are achieved the catalyst substrates will start to deteriorate. It is important that the cause is defined and rectified if subsequent melts are to be prevented.
Catalyst melts are normally accompanied by loss of power due to excessive back pressure. For additional information, refer to Section 303-07A or Section 303-07B.
High substrate temperatures are caused by the ignition or the fuel systems. For additional information, refer to Section 303-07A or Section 303-07B.
Misfires at high engine speed may result in an almost instantaneous melt.

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Mar 07, 2011 | 2003 Ford Focus

1 Answer

I have a 2001 jeep grand cherokee withe the 4.7 l v8 and im getting a code that reads main catalys bellow threshold upstream bank 2 it idles ok except rpm needle bounces a little


Your catalytic converter is not doing it's job efficiently enough and it is setting off your sensor. This problem is emissions problem and usually has no effect on the operation of your vehicle( unless the converter clogs) As long as you don't live somewhere they do emissions test you don't really have to worry about it. However if you want to fix it you can take converter off and run a straight pipe or to do it "right" you could go pay way to much to get a new converter put on.

Jan 26, 2011 | 2001 Jeep Grand Cherokee

1 Answer

1989 f150 302 V8 fuel injected emissions problem. Installed new engine from Ford, blew SKY HIGH on low and high idle emissions. Emission numbers were 10-20x max legal limit (over 3000). Replaced the...


the O2 sensor works on one volt .5 is around the running voltage, i would refit the air hose as it will run the converter hotter at idle.

Apr 26, 2017 | 1989 Ford F 150

1 Answer

How do you know if your cat converter is going bad? Can you test for it?


There are two ways a converter can fail:
  • It can become clogged.
  • It can become poisoned.
There really is no "inspection port" for the consumer or mechanic to see an actual clog in a converter. Often, the only way to tell if a catalytic converter is malfunctioning (plugged) is to remove it and check the change in engine performance. When a clogged converter is suspected, some mechanics temporarily remove the O2 sensor from the exhaust pipe ahead of the catalytic converter and look for a change in performance.
A catalytic converter relies on receiving the proper mix of exhaust gases at the proper temperature. Any additives or malfunctions that cause the mixture or the temperature of the exhaust gases to change reduce the effectiveness and life of the catalytic converter. Leaded gasoline and the over-use of certain fuel additives can shorten the life of a catalytic converter.
A catalytic converter can also fail because of:
  • Bad exhaust valves on the engine
  • Fouled plugs causing unburned fuel to overheat the converter
­Sometimes you can tell that a converter is clogged because you don't go any faster when you push the gas pedal. Also, there usually is a noticeable drop in gas mileage associated with a clogged catalytic converter. A partially clogged converter often acts like an engine governor, limiting the actual RPMs to a fast idle. A totally clogged converter causes the engine to quit after a few minutes because of all the increased exhaust back pressure.
The catalytic converter, like the rest of the emissions system, typically has a warranty length that exceeds the term of the warranty for the rest of a typical U.S. automobile.
Here is a safety reminder: Do not park your car over tall grass or piles of dry leaves. Your car's perfectly running catalytic converter gets very hot -- enough to start fires! You can keep it running well by keeping the ignition system in top shape, to prevent any unburnt fuel from entering the catalytic converter.

Dec 11, 2010 | 1989 Dodge Dakota 2WD

2 Answers

Need a pic or diagram of location of Bank 2 sensor location on a 2004 Acura TL 3.2


Oxygen Sensor-I don't have a location of the Bank 2 sensor, so you'll have to guess on it by determining how many sensors you have by inspecting the exhaust system from the exhaust manifold down to the catalytic converter and past the catalytic converter which is downstream. Anything before the catalytic converter is upstream.
Do you have a code that describes which O2 sensor is not responding correctly?

Test/Replace
  • The sensor is threaded into the exhaust manifold.
  • It can be difficult to remove unless a special anti-seize compound is coated onto its threads.
  • Torque the sensor to 30 foot-pounds using a special socket.
  • A sensor that is too loose or a cracked exhaust manifold can result in a lean signal to the computer.
  • Check the vents in the thimble of a replacement O2 sensor.
  • There should be the same number of holes and they should face clockwise or counterclockwise like the ones on the original sensor.
  • Installing the wrong sensor can result in slower cross counts.

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Operation
Although the oxygen sensor is termed a sensor, in actuality it is a galvanic battery. The oxygen sensor compares the potential difference between the ambient oxygen content around the exhaust and the oxygen content present in the exhaust stream. When the exhaust sample is lean, there is more oxygen in the exhaust as compared to the atmosphere. When the exhaust sample is rich, there is less oxygen content in the exhaust as compared to the atmosphere. The greater the difference between ambient oxygen and exhaust oxygen content, the greater the voltage produced.
For the oxygen sensor(s) to operate properly, it has to reach an operating temperature of approximately 600°F before a consistent voltage potential can be generated.
The Engine Management System (EMS) determines the state of readiness of the oxygen sensors by supplying a bias voltage of approximately 400 - 500mVDC to the oxygen sensor. As the sensor begins to warm up, the voltage produced increases due to rich exhaust mixtures commanded by the EMS. When the EMS senses a return voltage greater than the bias voltage, the computer will command the fuel mixture lean. When the output voltage from the sensor drops below bias voltage levels, the computer will command a rich mixture again. When the EMS determines that the O2 sensor has responded properly and within a predetermined amount of time, it will begin using the sensor as an input to adjust fuel trim.
Many Oxygen sensors used in OBD 2 engine management systems incorporate heaters. These heaters raise the sensors up to operating temperature quickly. The sooner the oxygen sensor gets to operating temperature, the sooner the EMS can maintain closer control over emissions, economy and performance. The oxygen sensor provides the computer with necessary information to maintain favorable operating conditions for the catalytic converter. The role of the catalytic converter is to store oxygen for the reduction of HC, CO and NOx emissions. The oxygen sensor input is used by the EMS to protect the catalytic converter by cycling the air/fuel mixture rich and lean. This provides adequate oxygen for storage while maintaining cool enough operating temperatures to prevent catalyst damage.
In addition to controlling the converters operating conditions for emissions control, the computer uses the oxygen sensors to tailor fuel trim providing a balance between fuel economy and performance.
Abnormal sensor activity has a profound effect on pulse-width and fuel trim strategies. Sensor values that indicate lean conditions will cause the computer to command changes in short term fuel strategies. Conditions such as secondary misfires create excessive HC levels. This also produces high oxygen levels in the exhaust. The oxygen sensor will sense only the increased oxygen content and input to the computer will be below bias voltage levels. The computer will respond by commanding additional fuel.
OBD 2 vehicles use oxygen sensors downstream of the converter(s) to monitor the efficiency of the catalyst. When the catalyst performs properly, available oxygen is used resulting in low levels oxygen in the exhaust sample. While downstream oxygen sensors are constructed the same as upstream oxygen sensors, the values that they generate are different. With relatively richer mixtures present around the downstream oxygen sensor, voltage inputs to the computer will be above the 450mV bias voltage. If the catalyst is operating effectively, the downstream oxygen sensor will cycle when the catalyst is flooded with oxygen. Typical values from the downstream oxygen sensor(s) are between 550- 900mV at idle.
While the downstream oxygen sensor is used to monitor catalyst efficiency, the upstream sensor has a pronounced effect on performance. Lean oxygen sensor values will result in an increase in pulse-width, excessive emissions, surging, hesitation, and potentially catalyst damage. Additional fuel can cause the catalyst temperatures to rise due to an afterburner effect in the converter. The oxygen sensor is the only post combustion input to the EMS. Other malfunctioning systems affect its operation.
Improper rich indications will cause lean operating conditions that may result in loss of power, hesitation, surging, poor idle quality and possibly converter damage. Sensors that do not switch properly, or are lazy do not provide accurate information to allow the computer to properly maintain the air/fuel mixture. Faulty heaters do not allow the sensors to reach operating temperature fast enough and the vehicle may remain in open loop for longer periods of time. Malfunctioning heaters also allow the sensors to cool down during periods of extended idle.
A faulty oxygen sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
Related Symptoms
  • Surging at idle
  • Unstable idle
  • Running rough off idle
  • Hesitation
  • Stumble
  • Chuggle
  • Poor fuel economy
  • Spark knock
  • Stalling on acceleration
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Oct 15, 2010 | 2004 Acura TL

1 Answer

2007 kia cylinder 3 miss fire and rough idle


I'd say most likely you're catalytic converter and or the EGR valve may need repaired or fixed. THe EGR recycles some exhaust in order to recombust fuel. The catalytic converter reduces toxicity of emissions. Car dealers can diagnose these thing for around $100-200.

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Check exhaust emission control system and catalytic converter.
These items have been integrated into a highly effective system which controls exhaust emissions while maintaining good driveability and fuel economy.

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