Choosing the Right Spark Plugs for Your 1987 GMC V1500
Get your classic truck running smoothly with the correct spark plugs for its simple and reliable ignition system.
- For the 1987 V1500, stick with standard copper core spark plugs from brands like AC Delco, NGK, or Autolite for best results.
- Avoid expensive platinum and iridium plugs; they provide no benefit for this truck's ignition system and can cause issues.
- Always manually check and set the spark plug gap to 0.035 inches before installation, as they are not always correct out of the box.
- While replacing plugs, inspect the spark plug wires, distributor cap, and rotor, as these are also common wear items on this vehicle.
Is Your V1500 Showing Signs of Bad Spark Plugs?
On a classic truck like the 1987 GMC V1500, the ignition system is straightforward, but worn spark plugs can still cause noticeable problems. Because these trucks use a simple distributor-based ignition, they are sensitive to plug condition. If your spark plugs are old or fouled, you might experience several issues that degrade your truck's performance.
- Rough Idle: The engine may shake or sound uneven when you're stopped.
- Hesitation During Acceleration: When you press the gas pedal, the truck might stumble or hesitate before picking up speed.
- Reduced Fuel Economy: You'll find yourself visiting the gas station more often as the engine burns fuel less efficiently.
- Difficulty Starting: A weak or inconsistent spark can make the engine harder to start, especially in cold weather.
- Engine Misfires: You might feel a jerking or sputtering sensation while driving, which indicates one or more cylinders aren't firing correctly. 🎬 Troubleshoot stalling and misfire issues on a GMC V1500 This can sometimes be caused by issues with the ignition control module or distributor, but spark plugs are the most common starting point.
Choosing Aftermarket Plugs: Keep It Simple
The ignition system on your 1987 V1500, likely with a 5.0L or 5.7L TBI engine, was designed for traditional copper core spark plugs. While modern engines benefit from expensive iridium or platinum plugs, they offer little to no advantage for your truck and can sometimes cause running issues. Sticking with a quality copper plug is the most reliable and cost-effective choice. Many owners and mechanics agree that the original AC Delco plugs or equivalent copper plugs from reputable aftermarket brands work best.
Aftermarket Spark Plug Brand Tiers for 1987 V1500
| Tier | Brands | Description & Vehicle-Specific Notes |
|---|---|---|
| OEM-Equivalent / Standard (Recommended) | AC Delco, NGK, Autolite, Champion | These brands offer standard copper core plugs that are perfect for the V1500. AC Delco R45TS is a common original part number. NGK and Autolite are highly regarded in forums for providing excellent performance and value. 🎬 See a buying guide for the best Chevy 350 plugs These plugs should be changed every 20,000-30,000 miles. |
| Premium (Use with Caution) | Bosch, Denso | These brands make excellent plugs, but their platinum or iridium offerings are often unnecessary for this engine. Some owners report that TBI engines can be sensitive to platinum plugs, particularly from Bosch. If you choose this tier, stick to their copper plug options if available. |
| Performance / Specialty | Accel, MSD | These brands are geared toward modified engines with high-performance ignition systems. For a stock or lightly modified V1500, these are overkill and a waste of money. Avoid gimmick plugs with multiple electrodes, as they provide no benefit for this engine. |
Pro Tip: Check the Gap! No matter which brand you choose, always check the spark plug gap before installation. For a 1987 V1500 with a V8 engine, the gap is typically 0.035 inches, but always verify with the emissions label under your hood. Do not trust that they are correctly gapped out of the box.
Known Issues, Recalls, and Service Bulletins
There are no specific recalls or technical service bulletins (TSBs) from GMC or the NHTSA related to spark plugs for the 1987 V1500. Any running issues like misfires are typically due to normal wear of ignition components like the plugs, wires, distributor cap, rotor, or ignition control module. Problems are almost always related to age and maintenance rather than a specific design flaw.
Frequently Asked Questions (FAQ)
How often should I change the spark plugs on my 1987 V1500?
For standard copper plugs, which are recommended, a replacement interval of every 20,000 to 30,000 miles is ideal. This keeps your engine running at peak efficiency and helps you spot other potential ignition problems during the tune-up.
🎬 Watch a full tune-up walkthrough for your 1987 truckWhat is the correct spark plug gap for my truck?
The most common gap setting for the V8 engines in these trucks is 0.035 inches. However, you should always confirm this by checking the Vehicle Emission Control Information label under the hood, as it is the most accurate source for your specific vehicle.
Should I use anti-seize on the new spark plug threads?
This is a topic of debate. Some mechanics apply a very small amount to the threads to prevent them from getting stuck in the iron cylinder heads. Others argue that modern plugs have a coating that prevents this, and anti-seize can cause you to over-torque the plug. If you do use it, apply it sparingly and be careful not to get any on the electrode.
Is it worth buying expensive iridium or platinum spark plugs?
No. The ignition system in the 1987 V1500 was not designed for them. You will spend more money for no performance gain, and in some cases, you may even experience a rougher idle or misfires. Stick with the simple, affordable, and effective copper plugs.
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Technical Specifications
OEM Part Numbers: R45TS
Engine: 5.0L V8, 5.7L V8 Recommended Plug Type: Copper Core Common OEM Part: AC Delco R45TS Common Aftermarket Cross-References: Autolite 26, Champion 25, NGK BPR4FS Thread Size: 14mm Socket Size: 5/8 inch Recommended Gap: 0.035 inches
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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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- 🛍️ Shop This Part
- Is Your V1500 Showing Signs of Bad Spark Plugs?
- Choosing Aftermarket Plugs: Keep It Simple
- Aftermarket Spark Plug Brand Tiers for 1987 V1500
- Known Issues, Recalls, and Service Bulletins
- How often should I change the spark plugs on my 1987 V1500?
- What is the correct spark plug gap for my truck?
- Should I use anti-seize on the new spark plug threads?
- Is it worth buying expensive iridium or platinum spark plugs?
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