Chrysler Imperial Spark Plug Wire Set Guide (1981-1983)
Keep your classic Imperial's unique V8 running smoothly with the right set of spark plug wires.
- This guide applies only to the 1981, 1982, and 1983 Chrysler Imperial models with the 5.2L 318 V8 engine.
- Symptoms of bad wires include rough idle, misfires, and poor acceleration.
- Upgrading from stock 7mm wires to an 8mm or 8.5mm aftermarket set from a brand like NGK, Taylor, or MSD is a worthwhile improvement for durability and performance.
- Replacing spark plug wires is a simple DIY task that can be done in under an hour; just be sure to replace them one at a time to maintain the correct firing order.
A Note on Vehicle Years
This guide is for the sixth-generation Chrysler Imperial, which was produced for model years 1981, 1982, and 1983. While the user's request mentioned 1977-1984, the Imperial was not in production during 1977-1980 or in 1984. All 1981-1983 Imperials came with a 5.2L 318 V8 engine.
Symptoms of Failing Spark Plug Wires
The spark plug wires on your Imperial operate in a high-heat environment and degrade over time. When they start to fail, you'll notice. The signs can be subtle at first but will worsen, impacting your car's performance and reliability.
🎬 Watch a mechanic explain common symptoms of ignition failure.- Rough Idle: The engine may shake or vibrate more than usual when the car is stopped because cylinders are not firing consistently.
- Engine Misfires: You might feel a jerking or stumbling sensation during acceleration. This happens when a wire fails to deliver spark, causing a cylinder to miss its power stroke.
- Hesitation During Acceleration: The car may feel sluggish or fail to respond immediately when you press the gas pedal.
- Reduced Fuel Economy: When spark is weak, fuel doesn't burn completely, leading to more frequent trips to the gas station.
- Visible Damage: A visual inspection may reveal cracks, burns, or melting on the wire's outer insulation or boots.
Known Issue: The EFI System
The 1981-1983 Imperials used a unique and often troublesome Electronic Fuel Injection (EFI) system. This system is very sensitive to any issues in the ignition system, including failing spark plug wires. Many of these cars were recalled and converted to a standard carburetor by dealers. Whether your Imperial is original EFI or carbureted, a strong spark from a good set of wires is essential for smooth operation.
Choosing the Right Aftermarket Spark Plug Wires
Since OEM Mopar parts for this specific vehicle can be difficult to find, the aftermarket is your best source. The brands available offer a range from standard replacement to high-performance options. Your choice depends on your budget and how you use your Imperial.
Brand Tiers for Your Imperial
Here’s a breakdown of the available brands to help you decide:
- OEM-Style Replacements (Good): Brands like Denso, NGK, and Standard Wires (Standard Motor Products) offer reliable, direct-fit replacement wires. They are designed to meet or exceed original factory specifications and are an excellent choice for a daily driver or a stock restoration. Forum users often recommend NGK for quality and reliability on Mopar engines. Denso wires are noted for their high-temperature resistance and strong terminal connections.
- Street Performance (Better): Brands like Accel and Taylor Cable are popular for mild performance upgrades. They often feature thicker 8mm or 8.5mm jackets for better heat protection and lower resistance spiral cores for a stronger spark. These are a good middle ground, offering better performance than stock without the high cost of racing wires. Reviews for Taylor wires are generally positive, citing good quality for a reasonable price.
- High-Performance (Best): For owners seeking maximum performance, MSD and Granatelli are top-tier choices. MSD's 8.5mm Super Conductor wires are frequently praised in forums for their extremely low resistance (around 40-50 ohms per foot), which means more spark energy reaches the plug. 🎬 See a resistance comparison between MSD and Accel wires. Granatelli offers zero-ohm wires, claiming maximum spark delivery. These are ideal for modified engines but can be considered overkill for a stock 318 V8.
Cost of a New Spark Plug Wire Set (1981-1983 Imperial)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Set | $40.99 - $141.44 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions
How often should I replace the spark plug wires on my Imperial?
A good rule of thumb is to inspect them with every spark plug change. Most manufacturers recommend replacing spark plug wires every 30,000 to 50,000 miles, or if you notice any of the failure symptoms listed above. Given the age of the vehicle, it's best to replace them if you don't know their age or condition.
Is it difficult to replace the spark plug wires myself?
No, this is a very DIY-friendly job on the 318 V8 engine. Access is generally good. The most important part is to replace one wire at a time to avoid mixing up the firing order. Labeling the wires before you begin is also a great practice.
What is the difference between 7mm, 8mm, and 8.5mm wires?
The measurement refers to the diameter of the wire. A thicker wire (like 8mm or 8.5mm) offers more insulation than a standard 7mm wire. This helps prevent voltage leaks and provides better protection against high engine heat, which is beneficial for the longevity and performance of the wire.
🎬 Learn more about how wire design and diameter affect performance.Can I just replace the one wire that is bad?
While you can, it's not recommended. Spark plug wires degrade at a similar rate. If one has failed due to age, the others are likely not far behind. Replacing them as a complete set ensures consistent performance and reliability.
Helpful Videos
Technical Specifications
Engine: 5.2L (318 CID) V8 Distributor Type: Electronic with female tower/points style cap Number of Wires: 8 + 1 coil wire
We Have This Part in Stock
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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