Q: Engine is misfiring and Check Engine Light is on - 2002 Toyota Tacoma

asked by on October 21, 2016

Vehicle engine occasionally starts missing and check engine light starts flashing.It will last for about approximately 5 min. I have had it checked by computer when it is running right and it says misfire on number 3 cylinder. I replaced coil,oxygen sensor,fuel filter,and plug tube set.The vehicle still has the same problem. Changed spark plugs also.

My car has 278000 miles.
My car has an automatic transmission.

Engine is misfiring Inspection $79.99 - $99.99 Get a Quote
Check Engine Light is on Inspection $79.99 - $99.99 Get a Quote

Hello. A flashing Check Engine Light is a sign that the computer has detected an issue that could potentially damage the vehicle’s emissions components. I would recommend scanning the trouble codes when the light is flashing in order to determine if there is a serious issue.

If there is a misfire on cylinder 3, and you have replaced those components, a few other things I would look into are the fuel injector for cylinder 3, the mass airflow sensor, the fuel pressure, and for any possible vacuum leaks.

I recommend having a certified mechanic, such as one from YourMechanic, perform an inspection to determine why the engine is misfiring and why the Check Engine Light is on.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Battery light

Hi There, It sounds like you may have a charging problem that may be a result of a faulty alternator or voltage regulator. You may have a failing voltage regulator that could be allowing the alternator to supply too much...

Very loud pop when turning sharp left leaking transmission or power steering fluid where steering column meet rack

Hi there. If everything else has already been installed from the donor vehicle then it sounds like the high pressure hose is all that you need to install. The hardest part of doing this is the routing. One thing you...

I have a 2010 Toyota Highlander and it’s making a rattling sound under the hood. It’s louder when idle. What could this be?

Louder at idle is a concern. At idle, oil pressure is at its lowest which particularly impacts the valve train. If the issue is not "within" the engine, other possibilities are the circuit of accessories that are driven by the...

Misfire P0304 and shaking

This may be related to fuel injectors not receiving the correct current or a faulty or dirty idle air control valve. As you know, the fuel injectors receive a certain electrical pulse that allows them to spray the correct amount...

Clear coat is all messed up, what happened?

Hello! Thank you for writing in about this problem. This is a fairly common issue with this generation of the Tacoma model. Most of it likely comes down to poor paint prep, thin coating, or contamination when the vehicle was...

I have 2009 Toyota Highlander, LIMITED.

Since you recently did some work on the driveshaft, I would first suspect there was a problem as a result of the installation process. Before you begin taking the wheel off for inspection, I would connect a scanner to retrieve...

Heater core malfunction

When the vehicle begins to overheat after cooling system repairs were done, it is usually due to air stuck in the cooling system. Normally after cooling system repairs, the coolant system is bled of all air, or "Burped". This is...

Car stalling at stops

It sounds like the idle speed is below specifications. I recommend having a trained technician, such as one from YourMechanic, retrieve any stored codes found within the computer and have them perform diagnostics based on the malfunctions that the computer...

Where do I find the engine number in a 2012 Toyota RAV4?

While your vehicle identification number includes a lot of information, it doesn’t provide much about the engine, other than the size that originally came with the car. The engine number tells a lot more. This information is located on the...

Related articles

P0775 OBD-II Trouble Code: Pressure Control Solenoid B Malfunction
P0775 means there is insufficient fluid pressure within a solenoid operating the automatic transmission due to leaks, low or dirty fluid.
P2774 OBD-II Trouble Code: 4WD Low Switch Circuit High
P2774 means a problem in the actuator switch circuit for 4WD. Problems may include faulty sensors, solenoids, switches and defective wiring harness.
P0553 OBD-II Trouble Code: Power Steering Pressure Sensor Circuit High Input
P0553 code means there is an issue with the power steering pressure sensor often caused by leaks or loose connections.