A Guide to Replacing Spark Plug Wires on Your 1993-1997 Chrysler Concorde
Choosing the right spark plug wire set is crucial for fixing misfires and keeping your Concorde's V6 engine running smoothly.
- You must know if you have the 3.3L or 3.5L V6 engine, as the wire sets are different.
- Before replacing, check the spark plug tubes for oil leaks from the valve cover gaskets, a very common issue on these cars.
- For best results on a stock engine, choose an OEM-quality brand like NGK or Denso.
- Always replace wires one at a time to avoid mixing up the engine's firing order.
Symptoms of Failing Spark Plug Wires
When the original wires on your Concorde start to fail, the signs are usually obvious. Because the wires are essential for igniting the fuel in each cylinder, a bad set can make the car run poorly. Look for these common symptoms:
- Rough Idle: The engine may shake or vibrate more than usual when you're stopped at a light.
- Engine Misfires: You might feel a stumbling, hesitation, or jerking from the engine, especially when you accelerate or go up a hill.
- Poor Acceleration: The car may feel sluggish or slow to respond when you press the gas pedal.
- Reduced Fuel Economy: When the engine isn't burning fuel efficiently due to weak spark, your gas mileage will get worse.
- Check Engine Light: A persistent misfire will often trigger the Check Engine Light. If the light is flashing, it signals a severe misfire that could damage your catalytic converter, and you should not drive the vehicle.
Check for Oil in Spark Plug Tubes
A very common issue on 1993-1997 Concordes is for the valve cover gaskets to leak oil into the spark plug tubes. When you pull the wire boot off the spark plug, you may find it soaked in oil. This oil will ruin the new wire boot and cause misfires even with a new set. If you find oil, you must replace the valve cover gaskets and spark plug tube seals to fix the problem permanently.
Choosing the Right Aftermarket Wire Set
You have two engine options in this generation Concorde: a 3.3L V6 and a 3.5L V6. These engines use different spark plug wire sets. Always confirm your engine size before ordering to ensure you get the correct part. Aftermarket brands for your Concorde can be grouped into three quality tiers.
OEM-Quality Replacement Brands
For most owners, these brands offer the best combination of reliability, fit, and value. They are engineered to meet or exceed the original factory specifications.
- NGK: Widely considered a top-tier choice for ignition parts on many vehicles, including Chrysler models. NGK wires are known for excellent durability and performance.
- Denso: Another highly respected OEM supplier that provides direct-fit wire sets known for their quality and longevity.
- Standard (SMP): Standard Motor Products is a long-standing aftermarket manufacturer that produces reliable, OE-style replacement parts.
Performance Brands
These brands are designed for high-performance applications. While they work perfectly well on a stock engine, they are generally not necessary unless you have made significant engine modifications.
- MSD: Known for high-performance ignition systems, MSD wires offer very low resistance and excellent heat protection. They are often more expensive and considered overkill for a daily driver.
- Granatelli: Another performance-focused brand offering wires designed to maximize spark energy.
Standard & Economy Brands
These brands provide a functional and affordable solution for getting your car back on the road. They are a good choice for budget-conscious repairs.
- Walker Products: A known aftermarket brand offering standard replacement wire sets.
- Crown Automotive: Offers direct-fit replacement sets that serve as a budget-friendly alternative.
Pro Tip: Replace Wires One at a Time
To avoid mixing up the firing order, replace only one spark plug wire at a time. Remove the old wire from the coil pack and the spark plug, then install the new wire of the same length in its place before moving to the next one. This ensures each cylinder gets spark in the correct sequence.
Aftermarket Spark Plug Wire Set Cost for 1993-1997 Chrysler Concorde
| Brand Tier | Typical Price Range | Notes |
|---|---|---|
| Standard / Economy | $35 - $50 | Good for basic transportation and budget repairs. |
| OEM-Quality | $50 - $80 | The recommended choice for reliability and longevity (e.g., NGK, Denso). |
| Performance | $75 - $160+ | Unnecessary for a stock engine but offers high quality (e.g., MSD). |
Frequently Asked Questions
Should I replace my spark plugs at the same time?
Yes, it is highly recommended. Worn spark plugs put extra strain on the ignition system and can cause new wires to fail sooner. Since you already have access, replacing the plugs and wires together ensures a complete ignition tune-up.
How do I know if I have the 3.3L or 3.5L engine?
The easiest way to check is to look at the emissions label under the hood, which will state the engine displacement. You can also find this information on your vehicle's original window sticker or by using a VIN decoder online. The wire sets for the two engines are not interchangeable.
What tools do I need to replace the spark plug wires?
For just the wires, you typically don't need any special tools. Grasp the boot firmly, twist it a half-turn to break the seal, and pull it straight off. If you are also changing the spark plugs, you will need a ratchet, a long extension, and a 5/8" spark plug socket.
Will performance wires add horsepower to my Concorde?
No. On a stock engine, high-performance wires will not create a noticeable increase in horsepower. Their main benefit is durability under high-heat, high-RPM racing conditions. A quality set of OEM-style wires from a brand like NGK will restore performance lost due to old, failing wires just as effectively.
Technical Specifications
OEM Part Numbers: 4728943 4728943AB 4728944
Set of 6 wires with silicone jacketing. Wire lengths and boot angles are specific to the 3.3L or 3.5L V6 engine. Most aftermarket sets use a 7mm or 8mm diameter wire.
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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.
- Chrysler Concorde:
- 🛍️ Shop This Part
- Symptoms of Failing Spark Plug Wires
- Check for Oil in Spark Plug Tubes
- Choosing the Right Aftermarket Wire Set
- OEM-Quality Replacement Brands
- Performance Brands
- Standard & Economy Brands
- Pro Tip: Replace Wires One at a Time
- Aftermarket Spark Plug Wire Set Cost for 1993-1997 Chrysler Concorde
- Frequently Asked Questions
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