Skip the auto shop - Our mechanics make house calls

Q: Misfiring. Changed the fuel pump and the plugs

asked by on

My car is misfiring. I changed the fuel pump and the plugs it is still misfiring. they diagnosed it with the computer still nada... I am so perplexed... What can I do?

My car has 144689 miles.
My car has a manual transmission.

Hi there. It depends on what type of digital scanner you’re using, but most professional scanners will be able to see the misfiring cylinder on the scope while the engine is running. This will typically also indicate which electrical sensor or ignition system component is causing the engine misfire. Without being there to examine your vehicle, it’s difficult to give you some potential ideas, but you might want to inspect the ignition coil or distributor cap to see if it’s cracked. You may also want to contact a professional mechanic to complete an engine is misfiring inspection on site.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Get a quote

What others are asking

Q: My car idles sometimes and there's a problem with the spark plug and coil all the time

Hello. Idle issues can be caused by a few different things. A few common causes are faulty coils, or an issue with the idle air control valve. The ignition coils are the components that generate the engine's spark. It may...

Q: My car has a rough idle and misfires once its warmed up

Hi, and thanks for contacting YourMechanic. First of all, the mass air flow (MAF) sensor requires its screen; the air registering through the sensor is monitored with the elements in the screen. By removing the screen, you actually destroyed the...

Q: Engine making weird noises.

Seeking a mechanics advice when car issues come up is always a good idea. Especially when it comes to engine noises. Since I don't know what kind of noise you are hearing, I will try to explain what is important...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.