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
$66.22 MSRP: $109.45
You Save: $43.23 (40%)
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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
ADD TO CART
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
$70.74 MSRP: $140.55
You Save: $69.81 (50%)
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
$70.74 MSRP: $140.55
You Save: $69.81 (50%)
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
View related parts
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 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.