Chevrolet G20 Spark Plug Guide: 1980-1987
Keep your classic G20 van running smoothly with the right set of spark plugs for its engine.
- For best results, use standard copper spark plugs from a reputable brand like ACDelco or NGK.
- Accessing the spark plugs requires removing the interior engine cover ('doghouse') and can be difficult for the rear cylinders.
- Always verify and set the spark plug gap before installation; a common gap is 0.045 inches, but check your vehicle's sticker.
- Due to the age of the vehicle, problems like rough running and misfires are common signs that the spark plugs need replacement.
Signs of Failing Spark Plugs in Your G20
The simple copper-core spark plugs used in 1980s Chevy vans have a limited lifespan. When they start to wear out, you'll notice it in how your van drives. Look out for these common symptoms:
- Rough Idling: Your van might shake or vibrate more than usual when stopped.
- Trouble Starting: The engine may take longer to crank over before it starts, or it might not start at all.
- Engine Misfires: You might feel a hesitation or stumble from the engine, especially when accelerating. This can sometimes trigger a Check Engine Light on later models.
- Poor Fuel Economy: If you're filling up the gas tank more often, worn spark plugs could be the cause.
- Loss of Power: A G20 that feels sluggish or struggles to get up to speed may need new spark plugs. 🎬 Watch: 7 common symptoms of bad spark plugs and replacement costs
Choosing the Right Aftermarket Spark Plugs
For a vehicle like the 1980-1987 G20, you don't need to hunt down original GM parts. The aftermarket offers excellent, reliable options that often meet or exceed original quality. ACDelco was the original equipment manufacturer (OEM), and their standard copper plugs are still a perfect choice for these vans. Here’s how the available brands stack up:
Brand Quality Tiers
OEM & Premium Aftermarket (Best Choice):
- ACDelco: As the original supplier, their standard copper plugs (like the R45TS) are a direct-fit, reliable choice that will restore original performance.
- NGK: A highly respected brand known for quality and durability. Their standard copper (V-Power) and platinum plugs are excellent options for a smooth-running engine.
- Denso: Another top-tier Japanese brand that makes quality plugs, often praised for reliability.
Standard Aftermarket (Good Value):
- Autolite: A solid, dependable choice that offers good performance for the price. Their standard copper and platinum plugs are popular.
- Champion: A classic American brand that has been making plugs for these engines for decades. Their standard copper plugs are a budget-friendly, effective option.
- Bosch: While a huge name in auto parts, their standard copper plugs are a better fit for these vintage engines than some of their more complex, multi-electrode designs.
Performance & Economy Tiers:
- MSD & Accel: These brands are geared towards high-performance and racing applications. While available, they are likely overkill for a stock G20 engine and come at a higher price.
- Skyward: This is likely a budget or store-brand option. While they may function, sticking with a well-known manufacturer like ACDelco, NGK, or Champion is a safer bet for long-term reliability.
Copper vs. Platinum/Iridium
Your G20's ignition system was designed for traditional copper spark plugs. They offer great performance and are very affordable. Platinum or iridium plugs can last longer but don't always provide a noticeable performance benefit in these older engines and can sometimes cause issues if the ignition system isn't designed for them. For best results and value, a quality copper plug from a brand like ACDelco or NGK is recommended.
Aftermarket Spark Plug Cost for 1980-1987 Chevrolet G20
| Tier | Price Range (Per Plug) | Price Range (Set of 8) |
|---|---|---|
| Economy (Skyward, store brands) | $3.53 - $5.00 | $28 - $40 |
| Standard Copper (ACDelco, Champion, Autolite) | $4.00 - $7.00 | $32 - $56 |
| Premium/Performance (NGK, Denso, MSD) | $6.00 - $12.00+ | $48 - $97+ |
*Prices are estimates based on the provided inventory range and are subject to change. They do not include taxes or shipping fees.
A Note on Installation Access
Replacing spark plugs on a G20 van can be challenging due to tight engine access. The engine is typically accessed by removing a cover (the "doghouse") from inside the cabin. Some plugs, especially those at the rear of the engine, can be difficult to reach. Having a variety of socket extensions and a swivel adapter is highly recommended.
🎬 See this step-by-step spark plug replacement on an '86 G20Frequently Asked Questions
What is the correct spark plug gap for my G20?
The correct spark plug gap depends on your specific engine and year. For many V8 models with HEI (High Energy Ignition) systems, a gap of 0.045 inches is common. However, some sources may recommend 0.035 inches. Always check the emissions sticker under the hood of your van first, as it often lists the correct gap. Even if plugs are "pre-gapped," it's crucial to check and adjust each one with a feeler gauge before installation.
🎬 Watch a full walkthrough of Champion spark plug and wire replacementHow often should I change the spark plugs?
For standard copper spark plugs in a 1980-1987 G20, a good rule of thumb is to replace them every 20,000 to 30,000 miles. This will help maintain peak performance and fuel efficiency. If you use longer-life platinum or iridium plugs, you can extend this interval, but copper plugs provide the best performance for the value in these engines.
Do I need special tools to change my spark plugs?
You will need a ratchet, a spark plug socket (usually 5/8"), various extensions, and a swivel joint to reach all the plugs. A spark plug gap gauge is essential for setting the gap correctly. Applying a small amount of dielectric grease to the inside of the spark plug wire boot can make future removal easier.
Are there any recalls for G20 spark plugs?
There are no specific recalls or Technical Service Bulletins (TSBs) from the NHTSA related to spark plugs for the 1980-1987 Chevrolet G20. Any issues you encounter will likely be due to normal wear and tear on these aging components.
Helpful Videos
Technical Specifications
OEM Part Numbers: R45TS CR43TS R44LTS6
Engine Type: V6 or V8 (e.g., 4.3L, 5.0L, 5.7L) Plug Type: Tapered Seat Common Gap: 0.045" (verify on vehicle sticker) Common Hex Size: 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.
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