How to check and adjust the Idle Air Control Valve for idle speed control on Mercury Grand Marquis?

The BPA-ISC valve controls idle speed by regulating Idle Air 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 Air Control Valve

Idle Control Valve

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11 Idle Air Control Valves found

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Mercury Grand Marquis Idle Speed Control
Part Number: 1S7Z-9F715-CA
$152.65 MSRP: $247.27
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Product Specifications
- Other Name: Valve Assembly - Throttle Air Bypass; 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 Idle Speed Control
Part Number: F5PZ-9F715-AA
$95.44 MSRP: $154.60
You Save: $59.16 (39%)
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Product Specifications
- Other Name: Valve Assembly - Throttle Air Bypass; 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
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Mercury Grand Marquis Throttle Valve Assembly
Part Number: F2AZ-9F715-A
$95.44 MSRP: $154.60
You Save: $59.16 (39%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Assembly - 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
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Mercury Grand Marquis Throttle Valve Assembly
Part Number: E9AZ-9F715-A
$68.63 MSRP: $109.45
You Save: $40.82 (38%)
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 Throttle Air By-Pass Valve Assembly
Part Number: 2W7Z-9F715-BA
$100.89 MSRP: $160.91
You Save: $60.02 (38%)
Product Specifications
- Other Name: Valve Assembly - Throttle Air By-Pass; 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
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Mercury Grand Marquis Throttle Air By-Pass Valve Assembly
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
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Mercury Grand Marquis Throttle Air By-Pass Valve Assembly
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
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Mercury Grand Marquis Throttle Air By-Pass Valve Assembly
Part Number: F6AZ-9F715-EB
Product Specifications
- Other Name: Valve Assy - Throttle Air By-Pass; 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
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Mercury Grand Marquis Throttle Valve Assembly
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
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Mercury Grand Marquis Air Bypass Valve Assembly
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 By Pass Valve
Part Number: E8DZ9B289B
Product Specifications
- Other Name: Valve Assembly - 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

Mercury Grand Marquis Idle Air Control Valve

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Mercury Grand Marquis Idle Air Control Valve Parts Questions & Experts Answers

Idle Speed Control
F5PZ-9F715-AA
Q:
How to check and adjust the Idle Air Control Valve for idle speed control on Mercury Grand Marquis?
Posted by Thierry M.
A:
The BPA-ISC valve controls idle speed by regulating Idle Air 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.
Answered by Ford Parts Specialist John / Oct 10, 2025