Choosing the Right Spark Plugs for Your 1966-1972 Fargo D210 Pickup
Get the right spark and keep your classic Fargo running strong with the correct new aftermarket plugs.
- Your Fargo D210 is mechanically similar to a Dodge D200, making parts easier to find.
- Standard copper-core spark plugs from brands like Autolite or Champion are the best choice for the original ignition system.
- Symptoms of bad plugs include rough idle, misfiring, hard starts, and poor gas mileage.
- Changing spark plugs is a simple, DIY-friendly task that you can do with basic tools.
Understanding Your Fargo D210
First, it's important to know that your 1966-1972 Fargo D210 is nearly identical to the Dodge D200 pickup of the same era. Fargo was a brand used by Chrysler mainly for the Canadian market, so most mechanical parts, including engine components, are interchangeable with their Dodge counterparts. This is good news, as it makes finding information and parts much easier. These trucks were typically equipped with either the famously durable Slant-6 engine or a dependable LA-series V8, like the 318.
Symptoms of Failing Spark Plugs
The tough, straightforward engines in these trucks will give you clear signs when the spark plugs are due for a change. If you notice your truck isn't running like it used to, worn or fouled spark plugs are a common and inexpensive place to start your diagnosis.
- Rough Idle: The engine may shake or run unevenly when you're stopped.
- Hard Starting: It might take more cranks than usual for the engine to fire up.
- Engine Misfires: You may feel a stumble or hesitation from the engine, especially when you accelerate.
- Poor Fuel Economy: Inefficient plugs can't burn fuel properly, meaning more trips to the gas station.
- Reduced Power: Your truck may feel sluggish or weak when you press the gas pedal.
Don't Ignore a Misfire
While these trucks are built to last, continuing to drive with a consistent misfire can cause other problems. A bad spark plug is a common cause, but it could also point to issues with the spark plug wires, distributor cap, or ignition points. Addressing it early is key.
Choosing the Right Aftermarket Spark Plug
For a stock 1966-1972 Fargo D210, you don't need expensive, fancy spark plugs. The ignition systems in these trucks were designed for traditional copper-core plugs, and they still work best. Both Autolite and Champion are well-known brands that were common choices for these Mopar trucks back in the day.
Brand Reputations:
- Autolite: Many classic Mopar owners find Autolite plugs to be very reliable and a great value. The Autolite 85 is a frequently mentioned part number for classic Mopar V8s.
- Champion: Champion was often the original equipment brand for Chrysler vehicles. While some owners are loyal to Champion, others have reported inconsistent quality in modern production runs and prefer other brands.
Pro Tip: Stick with Copper
Are expensive iridium or platinum plugs worth it for your old truck? For a stock engine, probably not. The ignition systems in these classic pickups are not high-energy systems and were engineered for standard copper plugs. Save your money and stick with what the truck was designed for.
Aftermarket Spark Plug Cost
| Tier | Brand Examples | Price Range (per plug) | Notes |
|---|---|---|---|
| Standard Aftermarket | Autolite, Champion | $3.50 - $9.31 | This is the recommended tier. These are standard copper-core plugs that are correct for the vehicle's original ignition system. |
Frequently Asked Questions (FAQ)
How often should I change the spark plugs?
For standard copper plugs in these engines, a good rule of thumb is to replace them every 10,000 to 15,000 miles, or every couple of years. This keeps the engine running at its best.
What is the correct spark plug gap?
The spark plug gap is crucial for a good spark. For most V8 engines of this era, the specification is typically 0.035 inches. However, always check the service manual or a reliable parts catalog for your specific engine. Never assume a new spark plug is gapped correctly out of the box.
Can I change the spark plugs myself?
Yes, absolutely. Changing spark plugs on a 1966-1972 Fargo D210 is a very easy job for a beginner. The plugs are usually easy to access on both the Slant-6 and V8 engines. You'll just need a basic ratchet, a spark plug socket, and a gapping tool.
What is a spark plug non-fouler and do I need one?
A non-fouler is an adapter that moves the spark plug farther out of the cylinder. It's a temporary fix used on an engine that burns oil to prevent the plug from getting fouled. If your engine is healthy, you do not need a non-fouler.
Technical Specifications
Engine options for this period primarily included the 225 cu in Slant-6 and the 318 cu in LA V8. Spark plug gap is typically 0.035 inches for V8 models. Always verify the correct plug and gap for your specific engine.
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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.