Why Does Snowblower Surge When Not Under Load

The last thing we want to come across is a snowblower surging when not under any load. 

Dealing with a snowblower that's surging when idle can be pretty frustrating, especially for someone new to using it. That's why I am here to tell you everything about "why does snowblower surge when not under load." 

So, without further ado, let's get started! 

Why Does Snowblower Surge When Not Under Load

Before telling you the reasons behind the surging in an idle snowblower, I would like to note that the problem isn't common in new machines. So, if you have just purchased the snowblower a couple of days or weeks back, try contacting the company for assistance if you face this issue. 

Another thing to note is that before you begin taking apart your snowblower, thoroughly go through its manual. Most brands mention basic troubleshooting options to run your appliance as smoothly as possible. The manual also lets you know how to take apart the snowblower and find the idle jet. 

Now, let's learn what might be causing the surging in an idle machine. 

1. Blocked Carburetor Idle Jet

A blocked carburetor idle jet is the most common reason for a snowblower surging when not under load or idle. It can easily get fully or partially blocked by dirt which can cause your machine to surge. 

If you didn't know already, like many other engines, a snowblower is fitted with a part called a carburetor. This small part has the job of mixing gas and air as well as supplying it to the engine. When the air to gas ratio, aka air-fuel ratio (AFR), is at fault, an engine won't run properly. The surging typically happens when the engine lacks the supply of gas. 

Besides, the carburetor has two circuits. The main one supplies the engine with gas when it's under load, that is when it's moving snow. While the idle circuit helps the engine not to die when it's idle or not under load. When the idle jet is clogged up, the engine doesn't idle properly, resulting in surging. 

The good news is that it's pretty easy to give your idle jet a thorough cleaning. And if you keep doing it once a year, your snowblower shouldn't surge when idle. 

Here's the simple cleaning process: 

• Find out the idle jet port, which is usually in the front of the carburetor
• Take out the idle adjustment screw 
• Remove the jet  
• Use a fine wire to clean and unclog the jet 
• Use a carb cleaner to clean the passage of the idle jet 
• Reattach the jet
• Test your snowblower for any surging 

Some snowblower models may have a carburetor bowl feed jet. To stop the surging, it needs to be cleaned. 

2. Carburetor Needs Replacement

If you have tried cleaning the idle jet of your carburetor and it's still surging, then replacement might be the next best option. But, first, I would like you to try adjusting the screw to see if that helps. I recommend changing the carburetor of any snowblower that's more than ten years old or has an extremely dirty carb. 

The health of your carburetor may also deteriorate if it gets gummed up by leftover fuel. That's why it's essential to keep up with your oil changes to prevent gumming, and you should make sure to use a fuel stabilizer. 

3. Contaminated Gas

On looking further into the problem of surging when idle, I found that an overlooked reason is the use of contaminated or bad gas. It can be due to the presence of water or if the gas has gone bad altogether. To fix this, you'll need to dump out the gas and make sure that the tank is clean before refilling. 

I have also noticed that surging can occur when the gas cap is damaged. In this case, all you need to do is replace the gas cap. 

Final Words

That's everything I had to tell you about why your snowblower may surge when not under load or idle. Remember to read the user manual for further instructions on taking care of surging or cleaning the carburetor idle jet. 

As mentioned before, if you have a new snowblower that is still under warranty, it's best to contact the company before taking apart the idle jet. Refrain from using the machine until they reach out to you so that the expert has an easy time finding the cause of surging. 

Until next time, goodbye, and take care!