Car Engine Backfire When Decelerating | All About Auto

search all about auto

Textual description of firstImageUrl

Car Engine Backfire When Decelerating

Car Trouble Symptoms:

During deceleration or while the car is slowing down the engine backfires.

Car Problem Diagnosis:
The car that backfires during deceleration is an indication that there is a possible problem on the emission control device or commonly known as the air injection system. Usually, the problem of the air injection system is the result of a failing diverter. The function of the air injection system is to pumps fresh air into the exhaust manifold so that any unburned gasses will completely be burned before it gets out the exhaust the tailpipe.

During deceleration the engine air/fuel mixture is rich that is why lots of unburned gasses go out the exhaust manifold. If all of these unburned gasses are exposed to fresh air a mini explosion will happen. Now, the diverter valve is the one that diverts the fresh air away from the exhaust manifold when the car decelerates, now if the diverter valve is failing the engine will backfire.

Possible Cause of Engine Backfire When Decelerating
Problem with the air injection system
The Truth About Cars
Image credit

What to do?
Bring your car to a reputable auto repair shop then ask the mechanic to inspect the air injection system to confirm the problem on the diverter valve. This is just a possible cause of the problem. There might be other cause of which can only be determined by actual inspection of the car. However, before proceeding with the repair check first with another mechanic, a second opinion is better before deciding in any repair works.

Suggested Articles:

What Causes Ticking Noise in Engine While Running

No comments:

Leave a Comment

“By sharing this information, you will help us expand the people we help.

Featured Post

Causes of Engine Knocking

An engine knocking occurs if the air-fuel mixture is not correct, this will result in the burning of fuel at a different portion in...

all about auto