How to check and adjust the bypass air valve (BPA-ISC) for idle speed control on Mercury Grand Marquis?

The BPA-ISC valve controls idle speed by regulating idle control valve. Check the voltage signal from the PCM at 10.5 volts with ignition On. Clean the valve and housing if needed. Adjust idle speed for 5.0L engines by adjusting throttle plate screw. For 1988 models, raise engine speed to 1800 rpm before adjusting. For 1989-1992 models, adjust throttle plate stop screw with 0.010-inch feeler gauge. 4.6L engines require professional service. To remove the BPA-ISC valve, unplug connector, remove screws, inspect O-ring, clean surfaces, install new O-ring, tighten screws, and reconnect connector.

Genuine Mercury Grand Marquis Idle Control Valve

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11 Idle Control Valves found

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Mercury Grand Marquis Valve Assembly - Throttle
Part Number: E9AZ-9F715-A
$67.56 MSRP: $109.45
You Save: $41.89 (39%)
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Product Specifications
- Other Name: VALVE ASY - THROTTLE
- Replaced by: E9AZ-9F715-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1990-1991 Mercury Grand Marquis | 8 Cyl 5.0L | 4AT AOD
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Mercury Grand Marquis Valve Assy - Throttle Air By-Pass
Part Number: 1S7Z-9F715-CA
$54.78 MSRP: $90.55
You Save: $35.77 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Idle Speed Control
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2006 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
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Mercury Grand Marquis Valve Assy - Throttle Air By-Pass
Part Number: F5PZ-9F715-AA
$85.03 MSRP: $140.55
You Save: $55.52 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Idle Speed Control
- Replaces: F2AZ-9F715-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1992-1995 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT, 4AT AOD, 4AT AODE
View related parts
Mercury Grand Marquis Valve Assembly - Throttle
Part Number: F2AZ-9F715-A
$85.03 MSRP: $140.55
You Save: $55.52 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: VALVE ASY - THROTTLE
- Replaced by: F5PZ-9F715-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1992-1995 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT, 4AT AOD, 4AT AODE
View related parts
Mercury Grand Marquis Valve Assembly - Throttle Air By-Pass
Part Number: 2W7Z-9F715-BA
$96.90 MSRP: $154.55
You Save: $57.65 (38%)
Product Specifications
- Other Name: Idle Speed Control
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
View related parts
Mercury Grand Marquis Valve Assembly Air Bypass
Part Number: E3TZ9B289G
Product Specifications
- Other Name: Valve Assy - Air By-Pass
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1980-1989 Mercury Grand Marquis | 8 Cyl 4.2L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT, 3AT C4, 3AT C6, 4AT AOD
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Mercury Grand Marquis Valve Assembly - Throttle Air By-Pass
Part Number: F8VZ-9F715-AA
Product Specifications
- Other Name: Valve Assy - Throttle Air By-Pass
- Replaced by: F8VZ-9F715-AB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-1999 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
View related parts
Mercury Grand Marquis Valve Assembly - Throttle Air By-Pass
Part Number: F8VZ-9F715-BA
Product Specifications
- Other Name: Valve Assy - Throttle Air By-Pass
- Replaced by: F8VZ-9F715-BB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2000-2002 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
View related parts
Mercury Grand Marquis Valve Assembly Air Bypass
Part Number: E8DZ9B289B
Product Specifications
- Other Name: Valve Assy - Air By-Pass; By-Pass Valve
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1983-1984 Mercury Grand Marquis | 8 Cyl 5.0L, 8 Cyl 5.8L | 4AT AOD
- 1980-1981 Mercury Grand Marquis | 8 Cyl 4.2L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT, 3AT C4, 3AT C6, 4AT AOD
View related parts
Mercury Grand Marquis Valve Assembly - Throttle
Part Number: E9AZ-9F715-B
Product Specifications
- Other Name: VALVE ASY - THROTTLE
- Replaced by: E9AZ-9F715-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1990-1991 Mercury Grand Marquis | 8 Cyl 5.0L | 4AT AOD
View related parts
Mercury Grand Marquis Valve Assy - Throttle Air By-Pass
Part Number: F6AZ-9F715-EB
Product Specifications
- Other Name: Idle Speed Control
- Replaces: F6AZ-9F715-EA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1996-1997 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W

Mercury Grand Marquis Idle Control Valve

The Idle Control Valve is an important component of Mercury Grand Marquis cars; it continues to control the engine idle speed by allowing the air to bypass the throttle plate. This electrical device is called the Idle Air Control (IAC) actuator and; in cooperation with the Engine Control Unit (ECU), they see to it that the engine does stall despite changes in loads placed on it. The IAC actuator usually uses a linear servo motor that moves a plunger in an effort to regulate the flow of air to the throttle body. These are very robust valves and had these problems which include, the valve can easily get blocked by dirt or dust in the engine room and this can cause erratic idle speeds. Cleaning of the Idle Control Valve thus requires regular conduct in order to enhance the efficiency of this component in the Mercury Grand Marquis vehicles to optimum level across their life cycle.

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Mercury Grand Marquis Idle Control Valve Parts Questions & Experts Answers

Valve Assy - Throttle Air By-Pass
F5PZ-9F715-AA
Q: How to check and adjust the bypass air valve (BPA-ISC) for idle speed control on Mercury Grand Marquis?
A: The BPA-ISC valve controls idle speed by regulating idle control valve. Check the voltage signal from the PCM at 10.5 volts with ignition On. Clean the valve and housing if needed. Adjust idle speed for 5.0L engines by adjusting throttle plate screw. For 1988 models, raise engine speed to 1800 rpm before adjusting. For 1989-1992 models, adjust throttle plate stop screw with 0.010-inch feeler gauge. 4.6L engines require professional service. To remove the BPA-ISC valve, unplug connector, remove screws, inspect O-ring, clean surfaces, install new O-ring, tighten screws, and reconnect connector.