Why My Engine Misfire After Using Seafoam?

Imagine working on your car and, you know your car is old and has massive carbon build-up in the engine and decided to use seafoam as an additive you used to clean up your engine.  and tried to start your car and it won’t start and check engine light arises, just horrifying, then the question arises- Why does my engine misfire after using seafoam? We got the answer for you to have look at. If you spray it too forcefully, seafoam may disintegrate and block your car’s vacuum system. As a result, more blockages may form. Aside from sludge, your vehicle’s engine may include a lot of dirt, debris, dirt, and other material.

What Sea Foam Does To An Engine?

It Helps to remove petroleum residues that are too viscous to disintegrate and hence prevent draining You may remove and clean loud lifters and chain tensioners using it with gas and diesel oil crankcases. And helps to clear off the engine internals.

What Caused Engine Misfire?

Misfires can occur for a variety of causes, the most prevalent of which are inappropriate installation, defective spark plug wire installation, carbon tracking, a lack of oxygen distribution, improper ignition coils, or vacuum leaks.

To check the problem we can use the OBD tool, just plug it in your OBD port located beneath the dashboard and run it if it shows codes like- P0300 or P0306 consider looking for a mechanic or replacing oxygen or plugs

How To Fix My Engine Misfire After Using Seafoam?

Engine misfire can be caused due to several reasons which can be your- spark plugs, wires, connectors, and several other factors which include

Carbon buildup on top of the pistons and/or intake valves might be causing the odd misfire. As a result, you might wish to attempt decarbonizing the engine. This is possible using a can of SeaFoam Motor Treatment.

  1. Bring the engine up to working temperature before turning it off.
  2. Start the engine and increase the idle speed to around 2,000 RPM.
  3.  Slowly open the pliers and pull some SeaFoam into the engine. When the engine speed begins to fall, clamp the hose again and let it rise again. Repeat until all of the SeaFoam has been removed from the can, then immediately turn off the motor.
  4. Wait for approximately a half-hour before restarting the engine and increasing the idle speed to around 2,000 RPMs until the smoke clears.
  5.  There will be a lot of smoke pouring out of the tailpipe the entire time you’re doing this. But that’s simply the SeaFoam at work.
  6.   Try that and see if it removes the misfire code.

Checking Other Problems Which Causing Engine Misfire

If the above method does not fix the issue try other methods which can be caused due to Plug Failure or Sensor Failures.

Step 1: Checking O2 Sensor


A malfunction with the part might cause a problem with your fuel system. The oxygen sensor and the mass airflow sensor will not function. In this instance, it will provide inaccurate data to your engine’s computer. Causing misfire.

Step 2: Checking Engine Plugs

Most of the time the engine misfire is caused due to faulty plugs after using seafoam the plugs get clogged or can generate enough spark. To ignite the engine and let the cylinder move, We will suggest you replace or interchange the plugs and try to start the car.

Replacing The Parts Causing Engine Misfire

Replacing the parts isn’t the hardest part in case of engine misfires after using seafoam, you just need simple tools and some time to workaround. Let’s fix the problems by-

Replacing O2 Sensor-

Replacing the O2 Sensor is fairly easy located under the car near the exhaust system connected with a wiring harness and simple clips to remove

Step 1: Raise The Car-

Jackup your vehicle using jacks safely to get enough space to remove the faulty sensor.

Step 2: Locating and Removing The Sensor

It’s the easy part to locate the oxygen sensor followed by its wiring harness. If you are having difficulty reaching it consider removing the tires and using the appropriate wrench or tools to snap off the sensor before removing the sensor unplug your battery terminals and remove the O2 wiring first.

Step 3: Replacing The Sensor

After removing the sensor try to measure its size with the new replacement so you’ll know the exact measurement and will know it’s fitting for your car. Just take it with the wrench and snap it back at the place where it belonged before putting the sensor clean the area and hole which wouldn’t interfere with the sensor and connect the wiring.

Step 4: Checking The New Replacement

After replacing the sensor plug in the OBD tool and remove all the fault codes and start your car and let it warm if the check engine light goes down. You are good to go if it stays still, Head to the next procedure.

Replacing Engine Plugs-

Engine Plugs are one of the vital parts for the functioning of the engine by creating sparks and starting the combustion inside the cylinder if it gets faulty it may cause problems like a misfire. To replace faulty plugs the steps are-

Step 1: Cleaning and Inspecting The Engine Bay

Before removing any wiring, first, remove the terminals from the battery and remove any dust or grease from the engine which may cause problems later

Step 2: Remove the Ignition Coil

Pull up the locking tab to disconnect the ignition coil electrical connector. Rock the connection away from the coil.
Pull out the complete coil and boot assembly.

Step 3: Removing The Plugs

Blow away any debris or grime that has accumulated on or around the plug since it was placed.
Place the spark plug socket of the appropriate size over the plug.
To dislodge the plug, use a sparkplug remover socket and turn it counter-clockwise.

Step 4: Installing New Plugs

Use a torque wrench and the spark plug torque standards provided by the manufacturer. Inadequate torque might cause a plug to blast out of the cylinder head, taking the threads with it.

Step 5: Installing Coils And Inspecting

Before replacing the coil, apply a small layer of dielectric grease around the inside of the spark plug boot. Replace the ignition coil, hold-down bolt, and electrical connector for the coil.

After all the steps clear all the codes and start the car and the check engine light must have gone and VOILA your car is good as it was


Does Using SeaFoam Affect Your Car?

It is made of petroleum and is compatible with both gasoline and diesel engines. Because Sea Foam does not include the many detergents and chemicals that others do, its engine will remain safe over time while not suffering from damaged surfaces.

Why Is White Foam Coming Out From The Exhaust?

When SeaFoam is utilized in high concentrations in a clogged-up automotive fuel system, it produces a lot of white smoke as well as a lot of carbon mess.


Seafoam is an additive and does not affect your car the carbon which has been up inside for a long time causes problems like engine misfire after using seafoam. If any problem occurs we have given you a detailed overview to look at.

Happy Driving


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