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Once hated and touted as “power robbers,” we’ve learned over the years how emission-control systems not only protect our environment, but also how they contribute to the overall performance, economy and longevity of today’s engines as an integral part of the combustion process.
Emission-control components are high on the list of parts you sell, because they affect vehicle operation, and if they’re not working properly, they result in the dreaded “Check Engine” light. There are many ways that the various emission systems on a vehicle tie together, but a look at the main players can help you develop a base understanding of how the overall system works.
Positive Crankcase Ventilation
Any internal-combustion engine produces blowby gasses, which are gasses from the combustion process that are forced past the piston rings into the crankcase. These gasses must be vented to prevent pressure buildup, which would cause oil to be forced past gaskets and seals. These gasses also combine with the oil vapors in the crankcase to form sludge and dilute the oil with unburned fuel.
From the early days, we knew that blowby gasses had to go, so we got rid of them – right into the atmosphere. At least that’s what we did until the 1960s (hello smog).
To reduce air pollution, auto manufacturers began to utilize positive-crankcase-ventilation (PCV) systems. PCV was a simple system to draw the vapors out of the crankcase using engine vacuum. The vapors and unburned fuel were then drawn back into the cylinders and burned, eliminating them as a source of air pollution.
But there was another benefit to it. Normal system operation pulled fresh air through the crankcase, which removed moisture – extending oil life and reducing sludge. Since PCV is more or less a controlled vacuum leak, the flow rate is important, and even on older vehicles, the fuel systems are calibrated to work in conjunction with it.
PCV systems still are utilized on modern engines, and engine-management systems are able to monitor their operation by checking the flow rate. The efficiency of modern PCV systems not only reduces emissions but also drastically extends oil life. PCV components range from the simple valves on an older vehicle to more complex integrated PCV orifices/oil separators found on or as part of the valve cover on many new engines.
Other PCV-related components include crankcase-ventilation filters and breather hoses. Don’t forget that these components are designed and calibrated to each engine and fuel system, even on older vehicles. Just because it fits doesn’t mean it’s correct, and also beware of aftermarket “catch cans.” Many people think this is a performance upgrade that traps oil vapor and contaminants before they’re drawn into the intake. This is true on some older vehicles, but on most modern engines the PCV system is so refined that it cannot be improved upon. Installing a “catch can” on these engines will most likely only result in a drivability issue.
Exhaust-gas recirculation (EGR) is an emission-control technique designed specifically to reduce the formation of nitrogen oxide (NOx), a very unhealthy and dangerous gas that’s formed during the high temperature and pressure of combustion. It works by recirculating exhaust gas back into the cylinders and cooling the combustion process.
In reality, it doesn’t actually “cool” the combustion process, but by displacing oxygen, it prevents the air/fuel mixture from burning hot enough to form NOx. EGR can offer advantages to the combustion process, and modern engine-management systems are designed to maximize this, with the efficiency of gasoline engines often improved as a result. Not only is it illegal, but disabling any type of EGR control also will result in a loss of performance.
On diesel engines, EGR is again an effective emission-control device, but becomes considerably more complicated. Since diesel fuel ignites with the heat of compression, higher temperatures promote efficiency … but unfortunately also the formation of NOx. To combat this, many modern diesel engines have EGR coolers that allow a larger mass of recirculated exhaust gas into the intake.
But, this reduces the efficiency of the combustion process, which creates excessive soot. To combat this, a diesel-particulate filter (DPF) is installed in the exhaust to capture and store the soot, which must be burned off periodically to regenerate the filter.
Since EGR systems are critical for emissions and performance, they’re closely monitored and controlled by the powertrain control module. Common EGR components include everything from the common EGR valve to pressure sensors, EGR tubes, EGR coolers, control solenoids and pressure sensors.
Exhaust and Catalytic Converters
Catalytic converters need no introduction. Since the 1970s, they’ve been the major emission component that chemically converts the harmful pollutants in the exhaust into harmless gasses. On todays’ vehicles, they work in conjunction with oxygen and/or air/fuel ratio sensors, also well-known emission-control components.
Before the converters (pre-cat), the oxygen sensors report the air/fuel ratio to the engine control module so it can adjust the fuel mixture based on operating conditions and ensure that an improper mixture will not damage the converter itself. After the converter, a post-cat sensor again sends a signal to the engine control module, from which it determines the efficiency of the converter.
The diesel side again can seem more complicated. They too have what appears as a catalytic converter, but on a diesel, they contain not only a catalyst but also the DPF. They’re sometimes referred to as aftertreatment devices, and overall design can differ between vehicle makes. The process that occurs is referred to as selective catalytic reduction (SCR), during which the catalyst works in conjunction with injected diesel-exhaust fluid (DEF) to convert NOx into nitrogen, carbon dioxide and water vapor.
The DPF traps the soot, which is burned off through passive or active regeneration, and in some situations the process must be performed by a service technician. NOx sensors monitor the entire SCR process.
In addition to catalytic converters, exhaust-related emission components include oxygen, air/fuel ratio and NOx sensors; DEF and DEF-related components; and diesel aftertreatment devices.
Evaporative emissions refer to anything that helps keep fuel vapors in the tank and out of the atmosphere. This requires very strict monitoring of the pressure in the tank, and when venting is required, filtering of the fumes. EVAP canisters – sometimes referred to as charcoal canisters – store fuel vapors to prevent them from reaching the atmosphere until they can be drawn in by the engine.
The entire process of evaporative emissions requires multiple components, including the EVAP canister, hoses, lines, canister-purge solenoids, canister-purge valves, canister-vent solenoids and leak-detection pumps. The design of these systems often differs between manufacturer, so it can take some time to get used to all the different components.
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Advance Auto Parts Offering Students a Chance to Win a ‘Fuel Ride to College’ and Free ‘Off-to-Campus’ In-Store ServicesBy Advance Auto Parts
ADVANCE AUTO PARTS OFFERING STUDENTS A CHANCE TO WIN A ‘FUEL RIDE TO COLLEGE’ AND FREE ‘OFF-TO-CAMPUS’ IN-STORE SERVICES
Incoming college freshmen can enter to win a “fuel ride” – four years of free gasoline – after new national survey reveals gas is a significant financial strain for majority of students
RALEIGH, N.C.--(BUSINESS WIRE)-- Advance Auto Parts (NYSE: AAP), a leading automotive aftermarket parts provider, announced today that it will help advance the education of incoming college freshmen, and ease their financial burden, by awarding 10 “fuel rides” in the form of four years of free gasoline to 10 lucky winners of the “Fuel Ride to College” sweepstakes.*
This press release features multimedia. View the full release here:
link hidden, please login to view Along with providing four years of free gas to 10 college students, Advance Auto Parts is offering free in-store services, including free battery testing and installation, wiper blade installation and check engine light scanning. (Photo: Business Wire)
Advance’s “Fuel Ride to College” sweepstakes arrives right on time as prices at the pump tick up. New data from Atomik Research reveals that 67% of college students cite gasoline for their automobile as being an expense that puts the most financial strain on their wallet**, while 76% of parents of incoming freshmen say they are worried about their student’s ability to afford gas.***
Parents also have significant anxiety regarding the safety of their college students when it comes to the automobiles they operate, according to Atomik Research surveys commissioned by Advance. Nearly two-thirds (63%) of parents of incoming college freshmen feel very or extremely anxious about their student’s safety when it comes to maintaining their cars and about three-fourths (73%) of parents have more anxiety about the car safety of their incoming college freshman than they did during the child’s senior year in high school.
Parents’ anxiety is warranted as more than half of college students admit to having ignored dashboard alerts and notifications, including “check engine” and “low battery warning,” according to the survey.
To help ease this anxiety, Advance and its team of friendly automotive experts are offering students and their parents free “off-to-campus” in-store services at Advance stores nationwide, including free battery testing and installation, wiper blade installation and check engine light scanning.
In addition to awarding 10 four-year “Fuel Rides to College,” Advance will also award 20 additional winners a $100 Advance gift card to stock up on essentials to help keep their automobiles in reliable shape this school year. If interested in learning more, visit
link hidden, please login to view through Aug. 18 to review eligibility requirements to enter for a chance to win and to review the sweepstakes rules. “Starting college is exciting for incoming freshmen, but that excitement is accompanied by anxiety and worry for both students and their parents, especially regarding finances and safety,” said Samantha Avivi, Advance’s chief marketing officer. “Through our ‘Fuel Ride to College’ program and complimentary curbside services for motorists, we want to put the brakes on fuel-filled worries for both students and parents, especially when it comes to having a reliable and safe automobile on the road to college, around campus, back home and everywhere in between.”
Additional data from the Atomik surveys validate the value of a “Fuel Ride to College:”
One-third (33%) of students cite that a lack of gas money or the cost of gas has deterred them from going to class, the library or study groups, while 60% of incoming college students’ parents express this exact worry: that the cost of gas will deter their child from going to class or education-related activities. Many college students choose between fueling their body and their automobile: more than one-third (36%) say they have compromised or cut back on groceries to fit gas money into their budget. One-quarter (25%) of college students say they’ve had to cut back or compromise school supplies to fuel their automobiles. Advance has also partnered with auto racing driver and television personality Arie Luyendyk Jr. to encourage incoming freshmen to enter for a chance to win a “Fuel Ride to College” and spread the word about Advance’s commitment to providing parents peace of mind via complimentary in-store services. Check out
link hidden, please login to view or visit an link hidden, please login to view to shop for auto parts and products needed to get vehicles in shape for the school year or to receive a free off-to-campus vehicle checkup. About Advance Auto Parts
Advance Auto Parts, Inc. is a leading automotive aftermarket parts provider that serves both professional installer and do-it-yourself customers. As of April 22, 2023, Advance operated 4,778 stores and 318 Worldpac branches primarily within the United States, with additional locations in Canada, Puerto Rico and the U.S. Virgin Islands. The company also served 1,315 independently owned Carquest branded stores across these locations in addition to Mexico and various Caribbean islands. Additional information about Advance, including employment opportunities, customer services, and online shopping for parts, accessories and other offerings can be found at
link hidden, please login to view. * NO PURCHASE NECESSARY TO ENTER OR WIN. A PURCHASE WILL NOT INCREASE YOUR CHANCES OF WINNING. Open only to legal residents of the 50 United States (D.C.), 17 to 20 years of age. Void where prohibited by law. Sweepstakes begins at 8:00 am ET on 8/7/23 and ends at 11:59 pm ET on 8/18/23. Subject to full Official Rules including prizes and odds,
link hidden, please login to view. Sponsor: Advance Stores Company, Incorporated, 4200 Six Forks Road, Raleigh, NC 27609. ** Atomik Research conducted an online survey of 1,003 college students across the United States between July 10 and 12, 2023. Qualified respondents are students currently enrolled or planning to be enrolled at a college, university, community college or trade school this fall and who own and/or regularly operate a car. The age of participants ranges between 18 and 24. Margin of error of the sample is +/- 3 percentage points with a confidence level of 95%.
*** Atomik Research conducted an online survey of 504 parents of incoming college freshmen across the United States between July 10 and 18, 2023. Qualified respondents are parents of incoming freshmen, who own or regularly operate a car, and are planning to be enrolled at a college, university, community college or trade school this fall. Margin of error of the sample is +/- 4 percentage points with a confidence level of 95%.
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Advance Auto Parts Contacts:
T: (919) 227-5466
E: [email protected]
T: (984) 389-7207
E: [email protected]
Source: Advance Auto Parts
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GB Remanufacturing announced its 2023 spring new-product release.
The release includes gasoline and diesel part numbers and further expands the company’s premium remanufactured fuel-injection program.
“We are very excited to announce our 2023 spring new-product release,” said Joe Evert, director of engineering & operations at GB Remanufacturing commented. “The release includes 25 part numbers that have been meticulously researched, developed and tested to the highest quality standards by our dedicated team at GB Reman.
“With these part-number additions, we look forward to continuing to provide our customers with industry-leading quality, coverage and value.”
GB Remanufacturing’s gasoline release includes both gasoline direct injectors (GDI) and multi-port fuel injectors (MPFI) and adds 24 part numbers to its comprehensive remanufactured gasoline fuel-injection program.
All GDI injectors include pre-installed combustion and fuel inlet seals and the necessary hardware to ensure a complete and trouble-free installation, according to the company.
GB Reman’s complete line of fuel injectors are remanufactured in the United States, tested to OEM specifications and backed by GB Reman’s 24-month unlimited mileage warranty.
GB Reman also offers a comprehensive line of fuel-injection seal kits that include seals and components previously only offered at the dealer. GB Reman seal kits include all the necessary components to reseal the injector and include hard-to-find spacers, O-rings and combustion seals for GDI injectors.
Diesel Fuel Injectors
Within its diesel fuel-injection program, GB Reman has expanded its coverage for the RAM 6.7-liter Cummins cab and chassis with the release of a new premium remanufactured diesel-fuel injector.
The premium fuel injector for the 2013-2018 RAM 6.7-liter cab and chassis features 100% nozzle and solenoid replacement. All control valves are independently tested and replaced as required.
GB Reman’s premium diesel fuel injectors are always remanufactured using OE-quality components. Each unit is 100% flow-tested at multiple operating conditions at full-rated pressure to ensure it meets or exceeds OE specifications, according to the company.
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Hi, i'm new here! Driving Subaru Forester 2010, and my car door fuel is worn-off. It has visible cracks and somewhat being neglected, anyone familiar with this product or has anyone tried this?
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