Skip the auto shop - Our mechanics make house calls

Q: How often show VM dealer need to clean fuel injectors. Still misfiring after fuel injection service

asked by on

Second shop look at diagnostic codes, shows 2nd cylinder misfiring and replaced dirty spark plugs. Still getting check engine light. Since 1st shop did fuel injection service the 2nd shop said only VM dealer can do fuel injector cleaning to stop misfires at slow speed. What do you suggest?

My car has 124000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Misfires can happen for many different reasons beyond just dirty fuel injectors. This may be due to a vacuum leak, but it can also be caused by a weak fuel pump (low fuel pressure) or a faulty fuel pressure regulator. It can also be caused by ignition misfire due to fouled spark plugs, bad spark plug wires, or weak ignition coil, a bad mass air flow sensor, a faulty crank position sensor, a faulty camshaft position sensor and many others. The best approach to identifying a misfire due to the broad spectrum of possibilities is to hook the car up to a scanner to download any fault codes that may be registered in the computer. These will further indicate more specifically what the cause of the misfire may be. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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!
  • Home
  • Questions
  • How often show VM dealer need to clean fuel injectors. Still misfiring after fuel injection service

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: After oil change, engine stutters, warning lights on

Hello. EPC stands for electronic power control, and the light is seen when there is a fault with the throttle body, traction control, throttle pedal, or cruise control systems. It is flashing because the car's computer can not compensate for...

Q: Tuck problem

Your fuel pump is located in the fuel tank. The fuel pump pick up tube generally extends from the pump motor to the bottom of the tank. If the pick up tube is cracked or broken at some point, when...

Q: Puttering noise from 25-35 mph

There are a few common problems with your vehicle. The first is a problem with the EGR system. There is a pipe that cracks at a flex joint and causes a small exhaust leak, but that is normally heard all...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.