What can cause a backfire through the intake?

Since the intake valve needs to provide the engine with a proper balance of fuel and air, a backfire occurs when that balance fails. In this case, having less fuel than air in the mixture will cause the small explosion.

What causes a generator to backfire through the carburetor?

What Causes Backfire Through the Carburetor 1 Lean Fuel-to-Air Conditions. Running an engine with a lean fuel-to-air ratio causes a slow combustion in the combustion chamber. 2 Timing issue. When it comes to a timing issue with backfire through the carburetor, an early spark is definitely the problem in this case. 3 Stuck Intake Valve. …

What does it mean when a generator dies under load?

As an Amazon Associate this website earns from qualifying purchases. When a generator starts and idles just fine, but then dies under load, it usually indicates a fuel delivery issue. My neighbor ran into this issue recently. Let’s make sure that you know what to do if it happens to you.

Why does my Onan generator keep backfiring?

It ran great. Then it chugged for a split secoond a couple times, then about 10 seconds later it backfired then died. Now it fires up no prob with the usual pop or two right after startup, but as soon as I turn on the AC unit (or any other heavy load) it bogs and backfires bigtime.

What to do if your generator is backfiring?

To find out if you have an issue with your valves you’re going to have to remove the valve cover at the minimum to check the rocker arm/tappet area and make sure that all the springs are compressed, the clearances are what they should be, and that nothing is bent or damaged.

Why does my Generator Backfire at the intake stroke?

When it comes to a timing issue with backfire through the carburetor, an early spark is definitely the problem in this case. Ideally, during the intake stroke, your piston descends down and pulls in an air-fuel mixture and then the valve is supposed to shut as the piston starts its path back up for the compression stroke.

What causes a generator to have an afterfire?

A very common cause of afterfires is also a rich air-fuel mixture entering the combustion chamber from the carburetor. If you have too much fuel in relation to the amount of air that goes into a combustion chamber, then the lack of oxygen won’t be enough to ignite all of the fuel that’s in there.