Spark Plug Replacement Guide for the 1977-1981 Peugeot 604
Keep your classic Peugeot 604 running smoothly with the right set of new spark plugs.
- Failing spark plugs can cause rough idling, poor acceleration, and reduced fuel economy.
- For a classic car like the 604, high-quality aftermarket brands like NGK or Denso are excellent choices and can offer longer life.
- Replacing spark plugs is an easy and inexpensive DIY job that can be done in under an hour.
- Always check the spark plug gap before installation to ensure it matches your vehicle's specifications.
Symptoms of Failing Spark Plugs in a Peugeot 604
Worn-out spark plugs can cause several noticeable issues. If your 604 is experiencing rough idling, hesitation during acceleration, or a general loss of power, old plugs could be the culprit. You might also notice the engine is harder to start, misfires, or your fuel economy gets worse. Sometimes, a check engine light may come on, but this is less common on vehicles from this era. These symptoms occur because a worn plug can't create a hot enough spark to burn the fuel mixture efficiently.
Don't Ignore Misfires
Consistently running your engine with a misfire can allow unburnt fuel to enter the exhaust system. This can lead to other problems and poor performance. Addressing failing spark plugs early is a simple and inexpensive way to protect your engine.
Choosing the Right Aftermarket Spark Plugs
For a classic European car like the Peugeot 604, you have several good aftermarket spark plug options. The original plugs were likely from brands like Champion or Bosch. However, modern technology means high-quality aftermarket plugs from brands like NGK and Denso can offer excellent, reliable performance, sometimes even better than the originals.
Brand Quality Tiers
- Premium Brands ($10 - $18+): NGK and Denso are top-tier choices, often using advanced materials like iridium or platinum. These materials resist wear much better than traditional copper plugs, meaning they last longer and provide a more consistent spark over their lifespan. For a 604 owner, this means fewer tune-ups and reliable ignition.
- Standard/OEM-Equivalent Brands ($4 - $10): Champion, a likely original brand for French cars of this era, is a solid, dependable choice. Autolite and Motorcraft also offer compatible plugs that provide good performance for a reasonable price. These are often copper-core plugs, which work very well but may need to be replaced more frequently than premium plugs, following the car's original service intervals.
- Budget Brands (Under $4): Brands like Skyward offer a low-cost alternative. While functional, they may not provide the same longevity or consistent performance as more established brands. For a classic vehicle, investing a few extra dollars in a well-known brand is usually a wise decision.
Pro Tip: Consider an Upgrade
Upgrading from standard copper plugs to modern iridium or platinum plugs can be beneficial for a classic car that isn't driven daily. These plugs resist fouling better and last much longer, which is ideal for vehicles that may sit for periods.
Estimated Costs for Spark Plug Replacement
| Item | Estimated Cost |
|---|---|
| Aftermarket Spark Plugs (Set of 6) | $20 - $110 |
| Shop Labor | $75 - $150 |
| Total Estimated Cost | $95 - $260 |
Frequently Asked Questions
Do I need to check the gap on new spark plugs?
Yes, it is always a good practice to check the spark plug gap with a feeler gauge before installation. While many plugs come pre-gapped, shipping and handling can sometimes alter the setting. The correct gap is crucial for optimal engine performance.
How often should I replace the spark plugs on my Peugeot 604?
For standard copper plugs, a good interval is every 12,000 to 15,000 miles, or every few years if you don't drive the car much. If you use premium iridium or platinum plugs, you can extend that interval significantly, often to 30,000 miles or more.
Are there any recalls for the 1977-1981 Peugeot 604 ignition system?
No specific recalls related to spark plugs were found for the 1977-1981 Peugeot 604 in the NHTSA database. Given the vehicle's age, any such campaigns would have ended long ago.
Is it difficult to replace the spark plugs myself?
No, replacing spark plugs on the Peugeot 604's PRV V6 engine is a straightforward task for a DIY mechanic. 🎬 Watch this video for a general guide on Peugeot spark plug replacement. Access to the plugs is generally good. You will need a ratchet, a spark plug socket, and a torque wrench to do the job correctly.
Helpful Videos
Technical Specifications
OEM Part Numbers: 5962.05 5962.09 5962.14 5962.15 5962.72 5962.87
Engine: 2.7L/2.8L PRV V6 Quantity Required: 6 Spark Plug Socket Size: 16mm or 5/8"
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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.