What is the general description and component replacement process for Exhaust Gas Recirculation systems and EGR Valve on Mercury Mariner?

Exhaust gas recirculation (EGR) systems in late-model vehicles serve two key purposes, lowering oxides of nitrogen (NOx) emissions and preventing significant engine knock or detonation. Again, by injecting into the intake manifold a low proportion of the exhaust, combustion temperatures are reduced since exhaust contains gases which do not burn. These combustion temperatures are higher than 2500 F and result in high NOx formation; they, in conjunction with HC and sunlight, cause photochemical smog. EGR systems are generally claimed to run with minimal problems and the failures are reported to occur when the EGR valve is closed or fully open. There may not be visible sign of a closed valve but it may cause engine detonation or overheating whenever it is under load and on the other hand, an open valve may cause rough engine operation and stalling. In component replacement, the procedure include lifting of the vehicle and removing of some connecting part such as EGR pipe and the valve in addition, the identities of all old gasket and deposits before fitting. One has to be extremely careful whenever the EGR pipe is removed from the valve, and always ensure that the pipe is changed together with the threads with any sign of deterioration. After reassembly there is need to make sure that the PCM relearns for its idle as well as for the fuel trim strategy.

Genuine Mercury Mariner EGR Valve

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8 EGR Valves found

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Mercury Mariner Exhaust Gas Recirculation Valve
Part Number: 9E5Z-9D475-A
$161.04 MSRP: $265.45
You Save: $104.41 (40%)
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Product Specifications
- Other Name: Valve - Exhaust Gas Recirculation; EGR Valve
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Mercury Mariner | 4 Cyl 2.5L PFI Gas/Electric | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Exhaust Gas Recirculation Valve
Part Number: 7L8Z-9D475-AA
$195.96 MSRP: $338.18
You Save: $142.22 (43%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve - Exhaust Gas Recirculation; EGR Valve
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2007-2008 Mercury Mariner | 4 Cyl 2.3L | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Valve Assembly
Part Number: E8AZ-9H465-B
$47.42 MSRP: $69.33
You Save: $21.91 (32%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Assy
- Replaced by: 6L3Z-9H465-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2006 Mercury Mariner | 4 Cyl 2.3L Hybrid Gas/Electric DOHC | CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Valve Assembly
Part Number: E8AZ-9H465-A
$26.51 MSRP: $37.77
You Save: $11.26 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Assy
- Replaced by: 6L3Z-9H465-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2006 Mercury Mariner | 4 Cyl 2.3L Hybrid Gas/Electric DOHC | CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Exhaust Gas Valve
Part Number: 1S7Z-9D475-AA
$80.25 MSRP: $130.00
You Save: $49.75 (39%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve - Exhaust Gas Recirculation
- Manufacturer Note: For coolant hose use 3S4Z-18472-AB., PZEV
- Replaced by: 1S7Z-9D475-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2011 Mercury Mariner | 4 Cyl 2.3L, 4 Cyl 2.3L Hybrid Gas/Electric DOHC, 4 Cyl 2.5L Duratec (110kW/150PS) | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
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Mercury Mariner Exhaust Gas Valve
Part Number: 9L8Z-9D475-A
$106.85 MSRP: $173.09
You Save: $66.24 (39%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve - Exhaust Gas Recirculation
- Replaced by: 9L8Z-9D475-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Mercury Mariner | 6 Cyl 3.0L OHC Duratec | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Exhaust Gas Recirculation Valve
Part Number: XR1Z-9D475-AB
$79.69 MSRP: $127.09
You Save: $47.40 (38%)
Product Specifications
- Other Name: Valve - Exhaust Gas Recirculation
- Replaced by: XR1Z-9D475-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2008 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
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Mercury Mariner Valve Assembly
Part Number: 6M6Z-9E441-A
Product Specifications
- Other Name: Valve Assy; Vacuum Solenoid
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | 4 Cyl 2.3L Hybrid Gas/Electric DOHC | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive

Mercury Mariner EGR Valve

The EGR Valve on the Mercury Mariner moderates exhaust gas flow back into the intake system, allowing for cooler combustion temperatures. This process hampers the formation of harmful NOx gas. Early models of the Mercury Mariner were equipped with a vacuum-controlled EGR Valve with a diaphragm that opened when manifold vacuum met the right threshold, with a positive or negative backpressure style valve that opened with exhaust pressure for steadier metering. As engine management technology improved, the later editions of the Mercury Mariner adopted electronic units that are either pulse-width modulated or fully digital linear, in which an internal motor and position sensor allow the computer to fine-tune flow and eliminate external switches for better response. In addition, the EGR Valve has newer feedback sensors. Each EGR Valve assembly is located between the exhaust and intake passages, regardless of version. It opens only under cruise or light acceleration and remains closed at idle, cold start, and wide-open throttle to prevent stumble or loss of power. Every design aims to fill a portion of the cylinders with inert gas, thereby lowering peak flame temperature and reducing knock. All Mercury Mariners should comply with emission rules, while a healthy EGR Valve prevents warning lights.

We provide a wide range of Mercury Mariner EGR Valve at the optimal prices. If you need Mercury Mariner EGR Valve, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your doorstep with a fast delivery service.

Mercury Mariner EGR Valve Parts Questions & Experts Answers

Exhaust Gas Valve
9L8Z-9D475-A
Q: What is the general description and component replacement process for Exhaust Gas Recirculation systems and EGR Valve on Mercury Mariner?
A:
Exhaust gas recirculation (EGR) systems in late-model vehicles serve two key purposes, lowering oxides of nitrogen (NOx) emissions and preventing significant engine knock or detonation. Again, by injecting into the intake manifold a low proportion of the exhaust, combustion temperatures are reduced since exhaust contains gases which do not burn. These combustion temperatures are higher than 2500 F and result in high NOx formation; they, in conjunction with HC and sunlight, cause photochemical smog. EGR systems are generally claimed to run with minimal problems and the failures are reported to occur when the EGR valve is closed or fully open. There may not be visible sign of a closed valve but it may cause engine detonation or overheating whenever it is under load and on the other hand, an open valve may cause rough engine operation and stalling. In component replacement, the procedure include lifting of the vehicle and removing of some connecting part such as EGR pipe and the valve in addition, the identities of all old gasket and deposits before fitting. One has to be extremely careful whenever the EGR pipe is removed from the valve, and always ensure that the pipe is changed together with the threads with any sign of deterioration. After reassembly there is need to make sure that the PCM relearns for its idle as well as for the fuel trim strategy.

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