Seasonal Fuel Blends And Misfires (VIDEO) -

Seasonal Fuel Blends And Misfires (VIDEO)

Here's what happens when your fuel does not match the weather. This video is sponsored by Standard Motor Products.

Have you seen an uptick in misfire codes or engines running rough at your shop in April or October? The cause of the misfires is the temperature fuel evaporates, otherwise known as the volatility.

Summer blends are designed to evaporate at higher temperatures to prevent evaporative emissions. During winter, they change the mix to be more volatile at lower temperatures for improved cold starts and lower start-up emissions. Gasoline distributors will change the formulations typically in late September and early April. But, it is difficult to predict the weather.

The fuel’s volatility can directly impact how the flame front propagates inside the cylinder under certain conditions like cold starts and high loads at specific engine speeds. One of the most common symptoms described is misfires when the vehicle is traveling at freeway speeds when the engine is between 2,000 and 3,000 rpm.

In this video, we look at what happens when the fuel does not match the weather. 

This video is sponsored by Standard Motor Products.

You May Also Like

Understanding Fuel Trims

The fuel trims are what govern what’s going on inside the engine. This video is sponsored by Auto Value and Bumper to Bumper.

Let's take a trip. It's 1974. You're in Denver, Colorado. You're in your car that has a carburetor, and you're getting ready to go over those rocky mountains to go to California. You've noticed that you're halfway up the mountain, the engine's starting to struggle. You go a little bit further. You notice that you start misfiring and the plugs are fouled. So what's going on here? Well, essentially with this, you have the blue, which represents oxygen, and the red represents fuel, and this is the perfect ratio. But you're taking away this oxygen, and when you take away the oxygen, you should take away the fuel. Carburetor can't do that because it has fixed jets, and the metering stays constant no matter what altitude you're at. This is why certain shops in Colorado specialized in carburetor tuning. Let's fast forward 50 years, and you're in a modern vehicle.

How-to Complete Emissions Monitors Faster

This video will focus on how a product like CAT COMPLETE can improve the chances of completing the monitors faster. This video is sponsored by Rislone.

How Important is Regenerative Braking For EVs?

Regenerative braking helps to increase the overall efficiency and range of the EV, increasing the range of an EV by up to 20%.

Get to Know Performance Ride Technology

PRT is a global OE supplier with more than 5,000 products available in the United States.

PRT Heavy Duty Highlights Shocks for CV Applications

Learn to install PRT Heavy Duty’s gas-charged shocks for enhanced driving stability in trucks and buses.

Other Posts

Fuel Tanks and Pumps

The behavior of the fuel wells, pumps & sending units are often misdiagnosed, leading to fuel pumps being replaced.

SMP Announces New Oil Filter Housing Kits

The kits feature multiple design improvements to prevent leaks, according to SMP.

Standard Motor Products Expands PAC-Kit Program

They are prepackaged A/C kits assembled and shipped in one package with everything customers need to perform a successful A/C repair.

Nylon Fuel Line Repair Techniques

Can you repair fuel lines yourself? Yes, if you make quality your number one priority when making decisions.