How to check and replace ignition coils in different types of ignition systems for the Mercury Grand Marquis?

For the distributor type ignition system (Duraspark II and TFI-IV), start by checking the primary and secondary coil resistance. With the ignition off, disconnect the wires from the coil and connect an ohmmeter across the coil primary terminals. If the resistance is not within the specified range, replace the coil. Next, measure the resistance from the positive primary terminal to the case of the ignition coil. If the resistance is less or more than the specified range, replace the coil. To replace the coil, disconnect the battery cable, detach the wires from the primary terminals, unplug the coil secondary lead, remove the bracket bolts, and detach the coil. Installation is the reverse of removal. For the electronic distributorless ignition (EDIS) system, start by checking the primary and secondary coil resistance. With the ignition off, disconnect the electrical connector(s) from the coil and connect an ohmmeter across the coil primary terminals. If the resistance is not the same for all four tests, replace the coil. Next, connect an ohmmeter between the secondary terminals of each coil pack. If the resistance is not within the specified range, replace the coil. To replace the coil, disconnect the negative cable from the battery, disconnect the ignition coil electrical connectors from each individual coil pack, disconnect the ignition wires, remove the bolts securing the ignition coil, and install the new coil following the reverse of the removal procedure. For the integrated electronic ignition system (COP), follow the diagnosis outlined in section 6. When it has been determined that a coil needs replacement, unplug the coil, remove the retaining bolt, remove the coil, inspect the spark plug, check the coil harness connector terminals, and then replace the coil and reconnect the harness.

Genuine Mercury Grand Marquis Ignition Coil

Ignition Coil Resistor

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Make

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

7 Ignition Coils found

View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: 3W7Z-12029-AA
$57.20 MSRP: $94.55
You Save: $37.35 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coil Assy - Ignition; Coil, Ignition Coil
- Replaces: 1L2Z-12029-AA, 8W7Z-12029-A, DG-540
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2001-2011 Mercury Grand Marquis | 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI | 4-Speed Automatic Transmission 4R75E Livonia, 4AT 4R70W, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: 1L2Z-12029-AA
$57.20 MSRP: $94.55
You Save: $37.35 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coil Assy - Ignition
- Replaced by: 3W7Z-12029-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2001-2006 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: F7PZ-12029-AA
$39.56 MSRP: $63.09
You Save: $23.53 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coil Assy - Ignition; Coil, Ignition Coil
- Replaces: F5FZ-12029-A, F32Z-12029-A, F5ZZ-12029-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1987-1991 Mercury Grand Marquis | 8 Cyl 5.0L, 8 Cyl 5.8L | 4AT AOD
View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: F5FZ-12029-A
$39.56 MSRP: $63.09
You Save: $23.53 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: COIL ASY - IGNITION
- Replaced by: F7PZ-12029-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1987-1991 Mercury Grand Marquis | 8 Cyl 5.0L, 8 Cyl 5.8L | 4AT AOD
View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: F5LY-12029-A
$71.28 MSRP: $117.82
You Save: $46.54 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coil Assy - Ignition
- Manufacturer Note: EDIS coil
- Replaced by: 7U2Z-12029-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1994-1997 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT, 4AT 4R70W, 4AT AODE
View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: 2C6Z-12029-AA
$39.63 MSRP: $78.73
You Save: $39.10 (50%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coil Assy - Ignition
- Replaced by: 4L7Z-12029-AB
- 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
View related parts
Mercury Grand Marquis Coil Assembly - Ignition
Part Number: F1VY-12029-A
$71.28 MSRP: $117.82
You Save: $46.54 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Coil Assy - Ignition
- Manufacturer Note: Id # F1VU 12029 A1A, F1VU 12029 A2A
- Replaced by: 7U2Z-12029-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1992-1993 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT, 4AT AOD, 4AT AODE

Mercury Grand Marquis Ignition Coil

The primary function of the Ignition Coil found in Mercury Grand Marquis automobiles is to take the battery voltage and step it up to the high voltage that is required to spark the combustible mix in the spark plugs. Such coils have primary and secondary winding of insulated copper wire on an iron core which stores energy in their magnetic field to produce the required spark. In the past years, ignition coils have come in various types, where there was the traditional system that came with mechanical contact breakers, and the contemporary system that has an electronic control mechanism together with power transistors. In new models, most commonly each cylinder has its own ignition coil, thus high tension leads and distributors are not used. They include the coil-on-plug and wasted spark concerning this, wasted spark system sparks two cylinders at the same time while it is believed that one is wasted. Problems with an ignition coil will cause engine ping or stumble, worse fuel efficiency and crippled power, making proper maintenance and checks crucial for the optimal performance of the vehicle.

We provide a wide range of Mercury Grand Marquis Ignition Coil at the best prices possible. If you need Mercury Grand Marquis Ignition Coil, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your door step with a fast delivery service.

Mercury Grand Marquis Ignition Coil Parts Questions & Experts Answers

Coil Assembly - Ignition
3W7Z-12029-AA
Q: How to check and replace ignition coils in different types of ignition systems for the Mercury Grand Marquis?
A: For the distributor type ignition system (Duraspark II and TFI-IV), start by checking the primary and secondary coil resistance. With the ignition off, disconnect the wires from the coil and connect an ohmmeter across the coil primary terminals. If the resistance is not within the specified range, replace the coil. Next, measure the resistance from the positive primary terminal to the case of the ignition coil. If the resistance is less or more than the specified range, replace the coil. To replace the coil, disconnect the Battery Cable, detach the wires from the primary terminals, unplug the coil secondary lead, remove the bracket bolts, and detach the coil. Installation is the reverse of removal. For the electronic distributorless ignition (EDIS) system, start by checking the primary and secondary coil resistance. With the ignition off, disconnect the electrical connector(s) from the coil and connect an ohmmeter across the coil primary terminals. If the resistance is not the same for all four tests, replace the coil. Next, connect an ohmmeter between the secondary terminals of each coil pack. If the resistance is not within the specified range, replace the coil. To replace the coil, disconnect the negative cable from the battery, disconnect the ignition coil electrical connectors from each individual coil pack, disconnect the ignition wires, remove the bolts securing the ignition coil, and install the new coil following the reverse of the removal procedure. For the integrated electronic ignition system (COP), follow the diagnosis outlined in section 6. When it has been determined that a coil needs replacement, unplug the coil, remove the retaining bolt, remove the coil, inspect the spark plug, check the coil harness connector terminals, and then replace the coil and reconnect the harness.