Chevy 350 Distributor Wiring Diagram

Posted on

Wiring a Chevy 350 distributor is an important part of ensuring your engine runs smoothly. The distributor is responsible for providing the spark that ignites the fuel and air mixture in the combustion chamber, so it’s essential to ensure that it is properly wired to prevent any misfires. This article will explain the procedure for wiring a Chevy 350 distributor, as well as provide information on the firing order for the engine, symptoms of a bad distributor cap, troubleshooting, and instructions for setting the initial timing.

Firing Order

Before you start wiring the Chevy 350 distributor, it is important to understand the firing order for the engine. The firing order for a Chevy 350 tells you the sequence that the spark plugs will fire. This helps to ensure that the cylinder heads get the correct dose of fuel and air mixture. The firing order for a Chevy 350 is 1-8-4-3-6-5-7-2. The distributor cap should also have this firing order printed on it.

Wiring the Distributor

Once you’ve confirmed the firing order, it’s time to start wiring the Chevy 350 distributor. The first step is to disconnect the negative battery cable from the battery. This will ensure that there is no power running through the system while you are working. Then, remove the distributor cap and rotor, if necessary. Next, locate the two wire harnesses on the side of the distributor. These harnesses will have two wires each – one black and one red. The red wire should be connected to the positive terminal on the coil, and the black wire should be connected to the negative terminal.

Once the wires are connected, you need to connect the spark plug wires to the distributor cap. You should pay attention to the firing order when connecting the spark plug wires, as it should match the firing order printed on the cap. Once all of the spark plug wires are connected, replace the rotor and cap onto the distributor. Finally, turn the ignition key to the “on” position and remove the distributor cap. Use a timing light to check that the timing is correct, and adjust it if necessary.

Symptoms of a Bad Distributor Cap

There are a few symptoms that can indicate a bad distributor cap on a Chevy 350. One of the most common signs is misfiring, which happens when the spark is not getting through to the spark plugs. This can cause your engine to run rough and can lead to a decrease in fuel economy. If your engine is running rough or emitting strange smells, it could be due to a faulty distributor cap. It’s also important to check the distributor cap for any signs of cracking, as a cracked cap can cause a number of problems.

Troubleshooting

If you suspect that your distributor cap is faulty, the first thing to do is to check for any signs of cracking or damage. If there is no apparent damage, the next step is to test the cap. You can do this by using an ohmmeter to measure the resistance between the terminals on the cap. A good cap should have a resistance of around 0.2 ohms. If the resistance is too high or too low, then the cap may need to be replaced.

Function of a Distributor

The distributor in a Chevy 350 engine is responsible for directing the spark from the coil to the spark plug. The distributor works in conjunction with the engine's ignition system to ensure that the spark plug fires in the correct sequence. Without the distributor, the ignition system would be unable to function properly, and the engine would not be able to run.

Checking and Adjusting Timing

Once the distributor is wired correctly, it's important to check and adjust the timing on the Chevy 350 engine. The timing refers to the point in the engine cycle at which the spark plug fires. To check the timing, you will need to use a timing light. Connect the timing light to the spark plug wires and then attach the other end to the battery. Start the engine and aim the timing light at the timing marks on the crankshaft. If the timing is not correct, you can adjust it by turning the distributor cap slightly.

Spark Plug Gap

The gap for the spark plugs in a Chevy 350 should be set to 0.035 inches. This gap is necessary to ensure that the spark plugs receive the correct amount of voltage, which will result in better engine performance. It's also important to make sure that the spark plugs are not gapped too wide, as this can cause misfiring. Setting the gap too narrow can also lead to misfiring, so it's important to get the right gap.

HEI Distributor Installation

If you're looking to increase the performance of your Chevy 350 engine, you may want to consider installing an HEI distributor. This type of distributor is designed to provide an improved spark and increased fuel efficiency. To install an HEI distributor, first disconnect the negative battery cable from the battery. Then, remove the old distributor and install the new one. Connect the HEI module to the distributor and then reconnect the negative battery cable.

Setting the Initial Timing

To ensure that your Chevy 350 engine is running at optimal levels, it's important to set the initial timing. To do this, first disconnect the negative battery cable from the battery. Then, disconnect the spark plug wires from the distributor cap and rotate the distributor until the timing mark is aligned with the timing mark on the crankshaft. Once the marks are aligned, replace the distributor cap and reconnect the spark plug wires. Reconnect the negative battery cable and start the engine to check that the timing is correct.

Wiring a Chevy 350 distributor is an essential part of maintaining your engine. Understanding the firing order and wiring procedure is integral to ensuring that your engine runs smoothly and efficiently. Additionally, understanding the symptoms of a bad distributor cap and how to troubleshoot and set the initial timing can help to prevent any potential problems with your engine. With these tips, you can ensure that your Chevy 350 is running at its best.


Minimum Wiring Required To Start Help

Minimum Wiring Required To Start Help Chevy Tri Five Forum

Gm Hei Ignition Distributor Wiring

Gm Hei Ignition Distributor Wiring Diagrams And Guide

Q A Chevy 350 Hei Distributor Wiring

Q A Chevy 350 Hei Distributor Wiring Diagram Ford Gm

Proper Distributor Ground Wire

Proper Distributor Ground Wire Connection Help The 1947 Present Chevrolet Gmc Truck Message Board Network

Chevy 350 Motor Distributor Cap Diagram

Chevy 350 Motor Distributor Cap Diagram For Firing Order

Hei Install Question Wiring The

Hei Install Question Wiring The 1947 Present Chevrolet Gmc Truck Message Board Network

Black Hei Distributor 45k Coil Wires

Small Cap Chevy Inline 6 Cylinder 235 Black Hei Distributor 45k Coil Wires Swapmeetparts

Gm Hei Ignition Distributor Wiring

Gm Hei Ignition Distributor Wiring Diagrams And Guide

Chevy 350 Engine Wiring Diagram Q A

Chevy 350 Engine Wiring Diagram Q A For Ignition System

Chevy 350 4pin Hei Wiring Questions

Chevy 350 4pin Hei Wiring Questions Tech Support Forum