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}Mercury Grand Marquis Ignition Coils
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WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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Summary:
- A faulty ignition coil is a common cause of engine problems.
- Common symptoms of a bad Mercury Grand Marquis ignition coil include difficulty starting your vehicle, Check Engine Light is on, coughing noises from the engine, and more.
- Common causes of ignition failure might include: excessive heat and vibration, voltage overload, internal arcing, shorts, and faulty spark plugs.
- Testing can be done manually, using an ohmmeter, using a spark tester, or using an OBD-II scan tool.
- The cost of a Mercury Grand Marquis ignition coil will depend on the design and type installed on your vehicle’s specific model year. OE replacement ignition coils will generally cost you anywhere between $7 to $861.
The Mercury Grand Marquis was known for its premium styling and smooth driving. As an older and discontinued model, your car may suffer from performance issues over time. Engine problems are commonly attributed to either the spark plug or the engine coil. In this article, we’ll take a closer look at Mercury Grand Marquis ignition coil problems, symptoms, and replacement.
Mercury Grand Marquis ignition coil problems & symptoms
- Check Engine Light is on
- Car won’t start
- Car is backfiring
- Sputtering noises from the engine
- Car isn’t idling smoothly
- Vehicle stalling
- Reduced fuel economy
Common ignition failure causes
- Excessive heat and vibration
- Voltage overload
- Internal arcing
- Shorts in the ignition coil
- Faulty spark plugs
How to diagnose ignition coil failure
Ignition coil failure causes a slew of issues that negatively impact the drivability of your vehicle. Here are several ways to test a faulty ignition coil:
How to test an ignition coil using an ohmmeter
- Review the coil test specifications in your car’s manual.
- Bench test an ignition coil using a digital 10 megaohm impedance ohmmeter.
- Connect the two test leads to the primary terminals (+ and -) of the coils. A working ignition coil should produce readings between 0.4 to 2 ohms.
- Connect the two test leads to the positive (+) terminal and the high voltage output terminal. Normal values range from 6,000 to 15,000 ohms.
How to test an ignition coil using a spark tester
- Make sure that the engine is turned off.
- Disconnect the ignition coil from the spark plug.
- Connect one test lead to the top of the spark plug, and the other to the ignition coil output.
- Once the tester is secure, start the engine.
- A working ignition coil will cause the tester to produce a flash of light, while a bad one will not.
How to test an ignition coil manually (coil-on-plug type)
If the Check Engine Light is illuminated, you should pull the trouble codes from your engine computer using an OBD-II scanner for an accurate diagnosis. Some examples of trouble codes related to cylinder misfire are P0300 through P0312.
If you don’t have a scan tool, you can check which cylinder is having issues by manually checking each cylinder.
- Start the engine.
- Open the hood and check the engine bay.
- Disconnect the coils one at a time.
- If removing a specific ignition coil doesn’t change the sound and vibration coming from your engine, it’s likely that it has failed.
- To double-check, swap the faulty coil into another cylinder that you know is working fine. Repeat the steps above to see if the issue follows the bad ignition coil.
As always, consulting a trusted mechanic is the best way to accurately diagnose and repair your vehicle. If you don’t have any of the tools or the experience required to do the steps above, you should immediately enlist the help of a professional.
How much does a Mercury Grand Marquis ignition coil cost?
The cost of a Mercury Grand Marquis ignition coil will depend on the design and type installed on your vehicle’s specific model year. OE replacement ignition coils will generally cost you anywhere between $8 to $861. These are available for purchase individually and you may choose between a universal or direct fit replacement for your car.
Tip for replacing ignition coils
There were four generations of the Mercury Grand Marquis before its discontinuation. Each generation had parts and accessories of varying designs and fit. CarParts.com can help you find the right replacement ignition coil for your car using our website’s built-in vehicle selector. Simply select your Grand Marquis’ model year to narrow down the search results to all compatible parts.
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