Boost Your MPG: Simple Distributor Point Adjustment (A Guide for Classic Car Enthusiasts)

Improving your car's gas mileage can feel like a constant battle, especially when dealing with older vehicles. While modern cars boast sophisticated fuel injection systems, classic cars often rely on the simpler, yet equally crucial, distributor. A properly adjusted distributor, specifically its points, can significantly impact your MPG. This article delves into the intricacies of distributor point adjustment, explaining its importance and providing a step-by-step guide. Remember, this guide is primarily for classic cars equipped with point-type ignition systems. Modern vehicles with electronic ignition systems will not benefit from this procedure.

Why is Distributor Point Adjustment Crucial for MPG?

The distributor points are critical components of your car's ignition system. They act as a switch, opening and closing to send high voltage to the spark plugs at precisely the right moment. Incorrectly adjusted points will lead to weak or mistimed sparks. This can cause incomplete combustion, resulting in wasted fuel and reduced MPG. Think of it as trying to start a campfire with damp kindling – you'll need much more fuel to get it going, and it might not even burn efficiently.

What are the Signs of Incorrect Distributor Point Adjustment?

Before you even begin adjusting your distributor points, it’s essential to identify if it’s actually necessary. Several symptoms indicate a misadjustment:

• Poor Fuel Economy: This is the most obvious sign. If your MPG has inexplicably dropped, faulty points might be the culprit.
• Rough Idling: The engine struggles to maintain a consistent idle speed, often fluctuating or stalling.
• Hesitation or Misfiring: The engine hesitates during acceleration or experiences misfires, leading to a loss of power.
• Difficult Starting: The engine takes longer than usual to start, especially in cold weather.

How to Check and Adjust Your Distributor Points: A Step-by-Step Guide

Disclaimer: Working with your car's ignition system involves high voltage electricity. Exercise caution and disconnect the negative battery terminal before proceeding. If you are uncomfortable performing this task, consult a qualified mechanic.

Tools Required:

• Dwell meter: This is the most accurate tool for point gap measurement.
• Feeler gauge: Used in conjunction with a dwell meter to check and set the point gap.
• Screwdriver (usually Phillips): To adjust the point setting screw.
• Wrench (size varies depending on your vehicle): To adjust the distributor's position.
• Owner's manual: Consult your car's manual for specific specifications.

Steps:

1. Locate the distributor: This is usually located on the engine, near the spark plugs.
2. Disconnect the negative battery terminal.
3. Access the distributor cap: Carefully remove the distributor cap.
4. Locate the points: These are two small metal contacts within the distributor.
5. Check the point gap: Use a feeler gauge and your owner's manual to check the recommended gap (usually between 0.016" and 0.020"). If the gap is incorrect, proceed to adjustment.
6. Adjust the points: Using the adjustment screw (usually located on the side of the distributor), carefully open or close the gap until the feeler gauge fits snugly.
7. Check with a dwell meter: A dwell meter provides a more accurate reading than just a feeler gauge. The dwell should match the specifications in your owner's manual.
8. Reassemble: Replace the distributor cap and reconnect the negative battery terminal.

What if the Problem Persists After Adjustment?

Even after careful adjustment, problems may remain. This might suggest other issues:

• Worn distributor points: The points might be too worn to function properly, requiring replacement.
• Condenser problems: The condenser works alongside the points and may also be faulty.
• Ignition coil issues: A failing ignition coil can also cause similar symptoms.
• Spark plug issues: Worn or fouled spark plugs can negatively affect engine performance.

How Often Should I Adjust My Distributor Points?

The frequency of adjustment depends on your driving habits and the overall condition of your ignition system. As a rule of thumb, you should check your distributor points at least once a year or every 10,000 miles. However, more frequent checks may be necessary if you experience any of the symptoms mentioned earlier.

This guide provides a basic understanding of distributor point adjustment. Remember, always consult your owner's manual for specific specifications and recommendations relevant to your vehicle. Proper maintenance of your ignition system is crucial for optimal engine performance and fuel efficiency. By mastering this simple adjustment, you can contribute significantly to boosting your classic car's MPG and prolonging its lifespan.