Choosing the Right Spark Plugs for Your 1982-1986 Pontiac Tempest
Keep your classic Tempest running strong by selecting the correct spark plugs for its specific engine.
- Stick with standard copper-core spark plugs from brands like AC Delco or NGK for best performance.
- Always verify and set the correct spark plug gap before installation.
- The 1982-1986 Pontiac Tempest is a rebadged Chevrolet Celebrity; parts information is interchangeable.
- While you're replacing the plugs, it's a good time to inspect the spark plug wires, distributor cap, and rotor.
Symptoms of Failing Spark Plugs
Worn or fouled spark plugs can cause a number of noticeable problems in your Tempest. Because these symptoms can also point to other ignition system issues, it's a good idea to inspect your spark plug wires, distributor cap, and rotor at the same time.
- Rough Idling: The engine may shake or vibrate more than usual when stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration.
- Reduced Fuel Economy: Inefficient combustion means you'll be visiting the gas station more often.
- Difficulty Starting: A weak spark makes it harder for the engine to turn over, especially when cold.
- Check Engine Light: On models equipped with one, a misfire can trigger the light.
Choosing the Right Aftermarket Spark Plugs
For a vintage vehicle like the 1982-1986 Tempest, newer doesn't always mean better when it comes to spark plugs. The ignition systems on these cars were designed for standard copper-core spark plugs. While modern platinum and iridium plugs last longer, they can sometimes cause a weak spark or other issues with the original distributor and coil setup. For best results, sticking with a quality copper plug is highly recommended.
Brand Recommendations
Your Tempest came from the factory with AC Delco parts. They remain an excellent choice for replacement.
- Tier 1 (Best Choice): AC Delco Conventional, NGK V-Power. These are high-quality copper-core plugs that work perfectly with the original ignition system. They are inexpensive and provide a strong, reliable spark.
- Tier 2 (Good Value): Autolite, Champion. These brands also offer dependable copper plugs that are a good match for your engine and offer excellent value.
- Tier 3 (Modern Plugs - Use with Caution): NGK G-Power (Platinum), Denso, Bosch Iridium. While these are quality plugs, their fine-wire design requires less voltage to fire, which can sometimes be less effective in older ignition systems designed for copper plugs. They offer no real performance benefit on these engines and are not worth the extra cost.
Pro Tip: Check the Gap!
Never assume a spark plug is gapped correctly out of the box. Always use a feeler gauge or gapping tool to check and adjust the gap to your engine's specific requirements before installation. The correct gap for your 2.5L or 2.8L engine can usually be found on a sticker in the engine bay or in a service manual.
Estimated Costs
| Part Type | Estimated Cost (Per Plug) |
|---|---|
| Aftermarket Copper (AC Delco, NGK) | $2 - $5 |
| Aftermarket Platinum/Iridium | $8 - $15 |
| Shop Labor (for replacement) | $100 - $250 |
Frequently Asked Questions (FAQ)
How often should I change the spark plugs on my Tempest?
For standard copper plugs, a good interval is every 20,000 to 30,000 miles or every 2-3 years. Given the low cost, frequent changes are an easy way to maintain engine health.
Can I use Iridium plugs to get more power or better MPG?
No. On an engine from this era, iridium plugs offer no measurable power or fuel economy benefits. The ignition system is not designed to take advantage of them, and you are better off spending the money on quality copper plugs and changing them more frequently.
What is a 'heat range' and why does it matter?
The heat range determines how hot the tip of the spark plug gets during operation. It's important to use the heat range specified for your engine. A plug that is too 'hot' can cause engine damage, while a plug that is too 'cold' can foul easily. Stick with the OEM-recommended heat range, such as an AC Delco R43TS or R45TS equivalent.
Is replacing the spark plugs a DIY job?
Yes, for many owners it is. The spark plugs on the front of the engine are very easy to access. On the 2.8L V6, the rear three plugs are more difficult and may require a variety of socket extensions and a universal joint to reach. However, with patience, it is a very achievable DIY task.
Technical Specifications
OEM Part Numbers: AC Delco R43TS AC Delco R45TS
Engine-specific spark plugs are required. The most common engines are the 2.5L 4-cylinder and the 2.8L V6. Common aftermarket plugs include NGK V-Power and standard Autolite or Champion copper plugs. The spark plug gap must be manually set before installation; check the under-hood emissions sticker for the exact specification.
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.
- Pontiac Tempest: