Choosing the Right Spark Plugs for Your 1984-1986 Renault Encore
Keep your classic Renault running smoothly with the correct new aftermarket spark plugs.
- Always replace spark plugs as a complete set of four to ensure balanced engine performance.
- Verify the spark plug gap is set to 0.032 inches before installation, regardless of the brand.
- For longevity and consistent performance, consider premium iridium plugs from brands like NGK, Denso, or Bosch.
- Failing spark plugs can cause rough idle, poor acceleration, and reduced fuel economy.
Symptoms of Failing Spark Plugs in a Renault Encore
When your spark plugs are worn out, they can't create a strong enough spark to burn the fuel properly. This can cause several noticeable problems. You might feel the engine shake or vibrate at idle, a condition known as a rough idle. Other common signs include difficulty starting the engine, reduced power when accelerating, and worse gas mileage than usual. If the problem is ignored, it can sometimes lead to a flashing check engine light, indicating an engine misfire.
Choosing the Right Aftermarket Spark Plugs
Since original equipment (OEM) spark plugs from Renault are no longer available for a vehicle of this age, you will be choosing from aftermarket brands. The good news is that many reputable manufacturers produce high-quality plugs that meet or exceed the original specifications for your Encore.
Your choice often comes down to the material of the spark plug's electrode, which affects performance and lifespan.
- Copper/Nickel Plugs: These are the most basic and affordable type, similar to what your Encore likely used from the factory. Brands like Champion and Autolite offer reliable copper plugs that provide good performance. They work perfectly well but have the shortest lifespan and should be checked and replaced more frequently.
- Platinum & Iridium Plugs: Plugs from brands like NGK, Denso, and Bosch often use precious metals like platinum or iridium. These materials are much harder and more durable than copper, allowing the plugs to last significantly longer. They also provide a more consistent and stable spark, which can help with smooth idling and fuel efficiency. For a classic car that may not be driven daily, these can be a great "fit and forget" option for many years.
Pro Tip: Check the Gap
No matter which brand you choose, you must make sure the spark plug gap is correct. The gap is the tiny space between the center and ground electrodes. For both the 1.4L and 1.7L engines in the 1984-1986 Renault Encore, the recommended spark plug gap is 0.032 inches. Most plugs come pre-gapped, but it's always wise to double-check with a feeler gauge before installation.
Aftermarket Brand Quality Assessment
For an older European vehicle like the Renault Encore, sticking with established brands is your best bet.
- Top Tier (NGK, Denso): These Japanese brands are widely regarded as the industry leaders for reliability and performance. They are a preferred choice for many European and Japanese vehicles and offer excellent longevity, especially their iridium options.
- Excellent (Bosch): As a German company, Bosch has a long history of making quality parts for European cars. A Bosch plug is often a direct equivalent to the original factory part and is a very safe and reliable choice.
- Standard (Autolite, Champion): These American brands offer dependable, budget-friendly options. Champion is listed as an OE-type equivalent for the Encore, making their standard copper plug a suitable stock replacement. While they may not last as long as iridium plugs, they perform well and are widely available.
Known Issues, Recalls, or TSBs
There are no recalls or Technical Service Bulletins (TSBs) from the National Highway Traffic Safety Administration (NHTSA) related to the spark plugs or ignition system for the 1984-1986 Renault Encore. A major recall was issued for the heater core in these vehicles (Recall 541), but it is unrelated to engine performance.
Cost for New Spark Plugs (1984-1986 Renault Encore)
| Part Type | Price Range (Set of 4) |
|---|---|
| New Aftermarket (Copper) | $14 - $25 |
| New Aftermarket (Iridium/Platinum) | $30 - $65 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions
Do I need special tools to change my Encore's spark plugs?
You will need a basic ratchet set, a spark plug socket (typically 5/8 inch), and a socket extension. A spark plug wrench is specifically designed for this job. A feeler gauge or gapping tool is also highly recommended to verify the plug gap is set to 0.032 inches.
Should I replace all four spark plugs at once?
Yes. Spark plugs wear out at a similar rate. Replacing all of them at the same time ensures balanced engine performance and saves you from having to do the job again in the near future. It is standard maintenance practice to replace them as a set.
Is it worth paying more for iridium spark plugs?
For most owners, yes. While the upfront cost is higher, iridium plugs can last up to three or four times longer than basic copper plugs. This means less frequent maintenance. They also provide a more consistent spark over their lifespan, which helps maintain optimal engine performance and fuel economy.
What happens if I don't change my spark plugs?
Continuing to drive with worn-out spark plugs will lead to worsening symptoms like rough running, poor acceleration, and lower gas mileage. In a worst-case scenario, persistent engine misfires can cause unburnt fuel to enter the exhaust system, potentially damaging the catalytic converter, which is a much more expensive repair.
Technical Specifications
Spark Plug Gap: 0.032 inches (for both 1.4L & 1.7L engines).
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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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