Choosing the Right Spark Plugs for Your 1980-1983 Dodge Mirada
Get the right spark and restore performance in your classic Mirada's Slant-6 or V8 engine.
- For stock ignition systems, use standard copper-core spark plugs from brands like NGK or Champion for best results.
- Always check and set the spark plug gap to 0.035 inches before installation.
- This is an easy DIY job that requires only basic tools and about an hour of your time.
- While Champion was the original plug, many modern owners prefer NGK for improved reliability and smoother idle.
Symptoms of Failing Spark Plugs in a Dodge Mirada
Old spark plugs can cause problems that you'll notice while driving. Because these cars use a distributor-based ignition system, symptoms can sometimes be similar to a bad distributor cap, rotor, or plug wires. If you're replacing plugs, it's a good time to inspect the other parts, too.
- Rough Idle or Misfiring: The engine may shake or stumble at idle or during acceleration. Some owners report a "wandering miss" that can sometimes be traced back to worn plugs or an incorrect fuel mixture.
- Difficulty Starting: A weak spark makes it harder for the engine to fire up, especially when cold.
- Reduced Power and Acceleration: You might feel like your Mirada is sluggish or slower than it used to be. Incomplete combustion robs the engine of power.
- Worse Fuel Economy: When the engine doesn't burn fuel efficiently, it has to use more of it, causing you to fill up more often.
- Engine Flooding: If a plug fails to spark, unburnt fuel can accumulate in the cylinder. You might smell gasoline when trying to start the car.
Choosing the Right Aftermarket Spark Plug
For a classic car like the Mirada, you don't always need the most expensive, high-tech spark plug. The original ignition system was designed for standard copper plugs. Here’s a breakdown of available brands based on owner feedback and general quality.
Brand Quality Tiers
- Tier 1: Highly Recommended
- NGK: Across Mopar forums, NGK is the most frequently recommended replacement brand for owners who want reliability and smooth performance. Many who have had issues with other brands find that NGK plugs solve their misfire or rough idle problems. The NGK V-Power line is a popular choice for these vintage engines.
- Tier 2: OEM-Style & Good Alternatives
- Champion: Champion was the original equipment (OEM) supplier for many Mopar vehicles in this era. Some owners insist on using them to keep the car original, and many have no problems. However, others report issues with quality control and fouling right out of the box, switching to NGK instead. If you choose Champion, buy from a reputable source.
Autolite: A solid, widely available alternative that many owners use with good results. They are comparable in performance and price to standard Champion plugs. - Tier 3: Performance Upgrade
- MSD: If you have upgraded your Mirada's ignition system with an MSD box or a hotter coil, MSD spark plugs are designed to work with that setup for maximum performance. For a stock engine, they are not necessary.
- Tier 4: Standard & Budget Options
- Bosch, Denso, Skyward: These brands offer functional, budget-friendly spark plugs. While they will work, they are not as commonly discussed or recommended in classic Mopar communities as NGK or Champion. They are a fine choice for a daily driver where cost is a primary concern.
Pro Tip: Copper, Platinum, or Iridium?
For a stock 1980-1983 Mirada, standard copper core spark plugs are the best choice. The ignition systems in these cars were not designed for the higher electrical demands of platinum or iridium plugs. While modern plugs last longer, they can sometimes cause a weaker spark or other issues in vintage ignition systems. Stick with copper for the most reliable performance unless you've upgraded your entire ignition system.
Cost of Replacing Dodge Mirada Spark Plugs (1980-1983)
| Part or Service | Estimated Cost |
|---|---|
| Aftermarket Spark Plugs (per plug) | $3.23 - $16.88 |
| Shop Labor | $50 - $120 |
| Total Job Cost (DIY) | $20 - $135 (for 6 or 8 plugs) |
| Total Job Cost (At a Shop) | $70 - $255 |
Cost estimates are for reference only and may vary by location and parts availability.
Frequently Asked Questions (FAQ)
What is the correct spark plug gap for my Dodge Mirada?
The most commonly cited spark plug gap for a stock Mirada is 0.035 inches. Some sources may list up to 0.044 inches. Always verify the gap with a feeler gauge or gapping tool before installation; do not assume they are correct out of the box. An incorrect gap can cause misfires and poor performance.
How often should I change the spark plugs?
For standard copper spark plugs used in these vehicles, a good interval is every 10,000 to 20,000 miles or every 2-3 years. Since these cars are often not daily drivers, time can be as important as mileage. Regular changes keep the engine running smoothly.
Is it hard to change the spark plugs myself?
No, this is a very easy job for a DIY mechanic. The engines in the Mirada offer plenty of room to access all the spark plugs with basic hand tools like a ratchet, extension, and a spark plug socket. Just be sure to work on a cool engine and clean the area around the plugs before removing them to prevent debris from falling into the cylinders.
Are there any recalls for Dodge Mirada spark plugs?
No, there are no recalls or common Technical Service Bulletins (TSBs) from Dodge or the NHTSA related to spark plugs for the 1980-1983 Mirada. Any issues you encounter will be due to normal wear and tear.
Technical Specifications
Engine Options: 3.7L (225ci) Slant-6, 5.2L (318ci) V8, 5.9L (360ci) V8. Spark Plug Type: Conventional copper core with a tapered seat. Spark Plug Gap: 0.035 inches for stock ignition systems. Common Part Number (V8): Champion N12YC.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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