If your car isn’t performing like it usually does, it could be the victim of an engine misfire.
When a vehicle doesn’t have the correct amount of air and fuel, it can result in a misfire.
Some misfire symptoms include a car running rough or struggling to accelerate. You might notice the check engine light turn on, too.
Many culprits can lie behind engine misfires.
To name a few possibilities, there could be something wrong with a valve, a sensor problem, or parts that have become worn out.
The reason may not be discovered through a visual inspection. Sometimes, a little detective work is needed to find the cause.
What caused an engine misfire on a Mini Cooper?
A Mini Cooper was brought into our auto repair shop because the check engine light turned on and it felt as though it was misfiring.
When one of our technicians checked the spark plug on cylinder 3, it was wet with gas.

An engine misfire was found on cylinders 1 and 3, and we moved the ignition coils from cylinder 3 to cylinder 4 and from cylinder 1 to cylinder 2. The misfire went to cylinder 4 and stayed on cylinder 3. The spark plug on cylinder 3 was wet again.
We performed a compression test on all four cylinders, and they were around 170 pounds per square inch (PSI).
Using a camera to look into the cylinders, we saw that cylinders 3 and 4 were wet. The fuel injector wasn’t spraying properly, which was causing the misfire.
To solve the problem, we replaced the spark plugs, ignition coils and fuel injectors.
How do you fix a misfire?
If you think your car is misfiring, you will want to bring it to a trustworthy mechanic or autoshop for diagnostic testing.
How we fix misfires depends on the diagnostic. You have several components that can cause a car to misfire.
Codes are a starting point and will determine what we do to diagnose the vehicle.
A variety of tools may be used during this process, including scan tools and cameras.
If the problem is internal, cameras allow us to take a look at the pistons.
With multimeters, we can check for poor voltage to and from the computer and to and from the secondary ignition. This tool is also used to look into the fuel injectors.
Occasionally, we will use a node light that lights up when the ignition coil is working.
On rare occasions, we might need to focus on the mechanical side and look at the timing.
Is it OK to drive with a misfire?
No, you should not drive a vehicle that has an engine misfiring.
If the problem is ignored, it may lead to additional repairs and unsafe driving situations.
Engine misfires could cause damage to the internals of the motor and the catalytic converter.
You also run the risk of your car stalling. Poor performance on the highway can be dangerous for drivers, their passengers, and others on the road.
When you’re not sure if it’s OK to drive a vehicle, pull over and contact an autoshop to see what they recommend.
HomeTowne Auto Repair & Tire is an authorized Michelin and BFGoodrich tire dealer located near Lake Ridge, Virginia. Automotive repair services are performed on all makes and models, including oil changes, brakes, alignments, inspections, and computer engine diagnostics.














