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Questions tagged [emissions]

The various chemicals emitted in exhaust gasses from an internal combustion engine. The usual gasses which are measured through emissions testing are Nitrogen Oxide (NO2), Carbon Monoxide (CO2), and HydroCarbons (HC).

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CO and Lambda fail after cleaner, air filter and throttle body clean

Went for an MOT, first test failed on high CO AND HC but normal lambda. Got new air filter, cleaned EGR and throttle body and added a cat cleaner into petrol tank. Second MOT failed due to high CO (...
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Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
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Anti Pollution Faulty

I have a 2006 Citroen C2 VTS ... At first it did not start and I exchanged the coil pack and the car was fine. Took it out for a test drive a few blocks down the road it cuts out. I switch it off and ...
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Catalytic Converter & o2 sensors

My truck..04 Dodge 1500..has 2 cats and 4 sensors. Each has 1 sensor before and 1 after. If I cut out the cat and leave the sensors. Will the computer still code or will it run ok?
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Are there any expected problems when I manipulate the air temperature sensor to show a cooler termperature?

I have a modern motorcycle with fuel injection. It runs lean and especially under 4,000 RPM that is annoying because the engine runs rough. It seem this is a well known problem with modern engines ...
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2004 toyota camry.Failed emission test with Lambda reading of 1.06.appreciate any advise on how to rectify

My 2004 Toyota Camry failed an emission test with a reading of Lambda 1.06 Would appreciate any advice on how to rectify. Austin Rep. of Ireland
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My truck failed emissions because they couldn't find the EGR

I just took my 2011 GMC Silverado 2500 w/Duramax in for an emissions test in Utah County. They do more than just emissions test. They look to make sure all the elements of the emissions system are in ...
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76 views

Emissions - High CO Reading

My 2004 Volkswagon Polo has just failed its emissions test. It has failed on the CO only, everything else is okay. The results are as follows: Engine/Oil Temperature: 92℃ (720 RPM) Low Idle ...
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Emissions reading on a 1993 Toyota Corona/Carina E 3SFE 2.0

Are these values normal for a 1993 car? If not, please tell me what should be fixed or replaced. I believe it's running rich based on the lambda value.
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Low idle after adding gasoline

This has happened twice now. My 2000 toyota sienna runs fine until I went to add gasoline. Upon startup, my idle was immediately much lower. I can rev throttle and it sounds smoothly until I release ...
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2k views

What can cause “check gas cap” warnings other than a loose gas cap?

I have a 2006 Saturn Ion, and a few months ago I started getting a warning about my gas cap. Specifically, as I was driving the dash display would beep and say "Check Gas Cap." I bought a new cap to ...
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2012 Mazda 5: P0422 Code

My 2012 Mazda 5 Grand Touring has been having the following problem. Sometimes it takes an extended amount of time to start and other times it will crank normally, but then sputter and stall. When ...
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Cannot hold constant RPM on Neutral with accelerator pedal

Having Chrysler Town & Country 2008 with 4.0L gasoline engine. Is it normal that i'm not able to keep engine at 2k RPM for 10 seconds? After some seconds, it just climbs itself up to 3k, but i'm ...
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Hi CO Emissions - Kial Soul+ 2.0L

My 2012 Kia Soul+ (53,700 miles) failed the emissions test for high HC and high CO at high RPMs (2500). After a new air filter, spark plugs, a professional injector and throttle body cleaning, the ...
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92 Toyota P'up Smog Test Fix?

My'92 Toyota P'up runs great, has had thorough annual maintenance since purchased new, & odometer is now at 166,500 miles. My last smog check indicated that the M1: 15 MPH "HC" (PPM) MEAS was 95, ...
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Check engine light : code p0455. Idling below 1,000 rpms losing Acceleration power at times and engine dies randomly

Car is a 2009 Chevy impala. Engine code p0455 is the only code my car shows. I have already had a vent solenoid replaced. It was the one by the gas tank that was about a year ago now. No issues ...
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What is exhaust gas recirculation?

From what I understand, EGR is used to reduce the temperature of combustion without increasing the amount of fuel injected to reduce NOx emission. This is done by reducing the oxygen percentage ...
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Does anyone know the OEM for the 2006 Infiniti qx56 oxygen sensors

I've got the part numbers and some cross references for the 2006 Infiniti QX56 oxygen sensors, but I would like to buy from the OEM. Bosch? Denso? infiniti front left/right 226937S000 bosch 17204 5 ...
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104 views

What could be causing High HC GPM, CO GPM, prevent the RPM from going over 4000, and creating an odd exhaust sound?

I have a Toyota Camry 94, it failed its emission test today with 2.62 HC GPM(Limit is 1.2) , 56.87 CO GPM (Limit is 15). The car also won't rev over 4000 RPM and acts as if it has a governor on when ...
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Car shakes upon startup, dies. Other times gas pedal does not respond

I'm pretty uneducated when it comes cars but im hoping you guys can help me. I have a 99 Ford Ranger that upon startup (not every time) shakes extremely hard and then dies. Other times when driving I ...
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High CO Emissions

My Yaris is due for an MOT this month. The last MOT report says that CO is right on the limit, everything else is normal HC, Lambda etc., as shown below. The CO has been creeping up every year, and ...
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Emissions check engine light on a Honda Civic

Would a dirty air filter trigger a check engine light "Check Emission System". It is intermittent and seems to come on while driving on the highway when the ambient temp is below 0 C. Any ideas or ...
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Engine grease fell into combustion chamber

I was changing a spark plug out on a 2000 Ford Expedition with a 5.4L Triton, with the coils on the plugs (COP), and I'm worried about how dirty it was. I was being as careful as possible, but I know ...
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6k views

Check emission system displayed on dashboard display

For the last week it has been extremely cold where I live (varies between -27 to -33 degrees Celcius). Is it possible for a fuel cap check valve to freeze open? Last night leaving work the display ...
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Won't pass emissions, Bad ECU?

So, Last year my 94 Acura Integra AT passed emissions by the skin of its teeth, this year it won't pass, I have noticed in past year and half that dropped from around 30mpg to about 15mpg. Some times ...
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Is it possible for me to see oxygen, caused by valve overlap, in the exhaust gases?

Recently I put my car on the 4 gas analyser, and it gave me these results at idle: CO2: 10.64 % CO: 4.98 % O2: 1.94 % HC: 148 ppm Lambda value: 0.93/13.7AFR I have to mention that it concerns ...
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GM P0420 Code - Eliminating Possible Causes in Chevy G10

I have a 1996 Chevy G10 van with 14X,XXX miles on it. It has the 5.0 engine. I do not have a scanner myself, but, according to a shop, the van was throwing code P0420. According to my research, this ...
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Are riding mowers required to have emissions controls in the US?

I know that regular push mowers are not required to have any sort of emissions controls, so mowing is pretty terrible environmentally. Riding mowers are bigger, and burn more gas, so without any sort ...
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560 views

What formula is used when deriving AFR/lambda value from emissions?

When you get your vehicle hooked up to a gas analser, you'll see the 4 or 5 kinds of emissions you're interested in, and a lambda or AFR value derived from those emission values. I was wondering how ...
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524 views

2006 Hyundai Sonata GLS emissions fail

I own a 2006 Hyundai Sonata GLS 3.3L v6 and recently gave it for some repair work after which the car failed emissions test.The shop told me that the oxygen sensor and Catalyst Monitor are not ready ...
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Illusive evap code - Hard to find the issue

98 Honda Civic Ex. For a while now my car will throw a p1456 evap code but sometimes it doesn't and the system completes the test. I'll randomly hook up my obd2 scanner and it'll either have a ...
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Why are there differences in 2 Smog Check VIRs?

I had 2 Smog Check Vehicle Inspection Reports within a week performed at different stations. I see differences in both the "Inspection Reason" and the "Software Version/EIS Number" plus the "Exhaust" ...
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Why did my smog check cost so much?

I have a 1991 Cadillac Eldorado and had to go to a Star Certified test station for a DMV-required biennial smog check. The technician gave me the price up front and I said that was a lot. He said the ...
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58 views

2010 Ford Fusion CARB certification

I have a 2010 Ford Fusion that I will be bringing from Texas to California. Will I need to do any modifications to be CARB certified?
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Why do tow truck drivers never turn off their engines? [closed]

I was at an outdoor wedding recently and I could hear a truck idling behind the hedges so I went to investigate. It was an AAA tow truck and the driver was filling out paperwork. I explained that a ...
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Results surprising said lab reporter of emission testing on Toyota Qualis Diesel 4 wheeler on AVL DiTest MDS 205

I got emissions of Toyota Qualis Diesel car tested with the AVL DiTest MDS 205, the result sheet had following columns rpm, temp, secs, CO(%vol.), CO corrected, CO2(% vol.), HC(ppm),HC corrected(ppm),...
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Why have to concentrate on exhaust gas instead of inlet mixture in Indian Bikes for emission control [closed]

I am having Apache RTR 180 (carburetor version) . Having a question towards Bharat Stage (BS) (Emission Norms) against bikes. Recently went through BS specification. To achieve this, we are going ...
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10k views

Emissions - High CO reading only

My 1999 Honda CRV has just failed it's UK MOT test on emissions. Results are below: 1st test: CO 0.73 (FAIL - max is 0.30) HC 78 (PASS - max is 200) Lambda 1.008 (PASS - between 0.970 & ...
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668 views

Effect of smoke ingestion on fuel injected car engine?

My father asks, can smoke in the air from wild fires cause a fuel injected engine to choke? (He seems to think this was once true for carbureted engines - was it?) My personal guess is that we can ...
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228 views

Why don't we have slow diesel engines? [closed]

I became very curious about this. Petrol engines run at higher RPMs to generate the required torque. Also, petrol burns well in a short amount of time. Diesel engines generate high torque at low ...
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1answer
581 views

Emissions Test / U0121 CEL Disimissed Itself

I own a 2005 Mazda 3 (SP 2.3 Manual) and I took the car to get the annual emissions test. During the OBD part of the test, my CEL came on, and the test listed a code of U0121. As far as I can tell ...
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What could cause high HC and CO, but low NO and CO2 in a smog test

Despite my confidence in having a (relatively) new catalytic converter and a new O2 sensor, my lovely 1994 BMW 325i Convertible got flagged as a "Gross Polluter." The test results are summarized below:...
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1k views

Would an ethanol engine require a catalytic converter?

Would an engine designed for 100% ethanol require a catalytic converter? From what I've read ethanol creates little to no carbon monoxide or hydrocarbons, and very low amounts of NOx. Not sure how ...
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What is the purpose of secondary air injection?

What is the purpose of secondary air injection in a gasoline engine? It seems to be an old technology, according to Wikipedia it was introduced in 1966. Does secondary air injection have any value in ...
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When will a new emission driving cycle be implemented?

For emssion tests, they have used the NEDC driving cyle here in Europe for quite a while now. I'm not sure about America and Asia, but i believe they use similar driving cycles. After the emission ...
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PCV Valve hose question

What is a PCV Valve Hose made of? Can any rubber hose replace it? Like the rubber hoses used for gas lines in lawnmowers? Does it need to be made of some type of plastic? From what I understand, the ...
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2k views

P0171 and P0174 in 2008 Range Rover HSE

I have a 2008 Range Rover HSE with 147,000 miles. I got a check engine light and the PID indicated catalytic converters in bank 2 were bad. I replaced the cats and then started getting P0171 and ...
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6k views

Will eliminating factory catalytic converter have effect on emission testing?

I'm not exactly a car guy or know much about cars, but I would love to get some performance headers installed. The problem is that the headers that I found for my car state the following "Eliminates ...
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1answer
896 views

How are EVAP system leaks detected by the ECU?

I am curious which sensor(s) detects an EVAP leak and throw error codes, for example: P0442 - EVAP System Leak Detected (small leak) P0455 - EVAP System Leak Detected (large leak) My car is a 2003 ...
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What are vehicle emission limitations in Bavaria? [closed]

I currently work in USA but I'm going to relocate to Münich, Bavaria. The thing is I want to transport my 2001 Ford Mustang to Germany. My only concern (other than costs of course) is that European ...