A professional mechanic would start by downloading all OBD - II trouble codes, as this would lead them to a bank (or side of the motor) where
the faulty injector is faulty.
There are several possible sources that trigger these two codes including a faulty fuel pressure regulator, weak fuel pump, clogged fuel filter, faulty powertrain control module, vacuum leak,
faulty injector (s), faulty oxygen sensor (s) and a faulty mass air...
A faulty injector will allow a lot more fuel through, usually accompanied with black smoke from the exhaust.
My Nissan Sylphy with a 2L Neo Direction Injection engine was running rich due to 2
faulty injectors (leaking) and I replaced all 4 injectors three months ago.
Not exact matches
CARS.COM The problem: The engine may malfunction due to
faulty fuel
injectors.
This covers several possibilities like leaky fuel
injectors, fuel leaks in the fuel lines,
faulty fuel pump check valve or
faulty fuel pump accumulator.
That is right, If the engine is not starting due to no ignition (maybe flooded or
faulty ignition), but the
injectors or carb is fueling, then the fuel will be getting blown out of the exhaust ports.
The P0420 code seems to indicate a few different possible points of failure including
faulty fuel
injectors, I'm just unsure what my best mode of attack would be (short of taking it in to a mechanic — unless this is necessary).
Possible causes are an incorrect fuel mixture, incorrect timing, corroded spark plugs, a
faulty oxygen sensor, sticking float,
faulty fuel
injector or a malfunctioning check valve.
I also used a mechanics stethescope to listen to the front fuel
injectors as I read that these lean codes could be caused by a
faulty or clogged fuel
injector.
The fuel
injector to the cylinder could simply be
faulty or there...
Other causes of hard starting are a
faulty engine coolant temperature switch (sensor), worn spark plugs, inadequate fuel delivery or pressure (e.g., clogged fuel filter), dirty fuel
injectors, contaminated or old gasoline, poor engine compression, and so forth.
Hi There, There are a number of things that may cause the car to hesitate when accelerating such as low fuel pressure, a dirty or
faulty mass air flow sensor, clogged or dirty fuel
injectors, a
faulty throttle position sensor...
There are many causes of hard starting but illustrative ones are a
faulty engine coolant temperature switch (sensor), worn spark plugs, inadequate fuel delivery or pressure (e.g., clogged fuel filter), dirty fuel
injectors, contaminated or old gasoline, malfunctioning idle air control valve, poor engine compression, and so forth.
Some of the components that could be dirty or
faulty include the fuel
injectors, the throttle body (https://www.yourmechanic.com/article/how-to-clean-a-throttle-body-by-timothy-charlet), or the EGR system.
In some cases, the delayed throttle response you're talking about is caused by a
faulty electronic throttle control or excessive carbon deposits on fuel system components like the throttle body, fuel
injectors and mass air flow sensor.
A rough idle (https://www.yourmechanic.com/services/car-idle-is-rough-inspection) may be caused by things such as low fuel pressure, low voltage to the fuel
injectors, dirty fuel
injectors, a vacuum leak, a
faulty...
Stalling at idle could be due to a
faulty mass airflow sensor,
faulty camshaft or crankshaft position sensors, worn spark plugs, wires or defective ignition coil (s), inadequate fuel delivery or pressure (clogged fuel filter,
injectors,
faulty fuel pump or pump circuit), contaminated or old gasoline, defective throttle position sensor,
faulty idle air control valve, leaks in the EGR system, intake vacuum leaks, and so forth.
There are many causes of hard starting but illustrative ones are a
faulty engine coolant temperature switch (sensor), malfunctioning idle air control (IAC) valve, vacuum and EGR leaks, inadequate fuel delivery or pressure (clogged fuel filter, dirty fuel
injectors), and contaminated or old gasoline.
It sounds like you may have a fuel supply problem in getting the proper amount of fuel to the fuel
injectors which may be caused by a bad fuel pump or potentially
faulty fuel
injectors.
Some common causes of too much fuel being delivered in a situation like that you describe are: a
faulty coolant temperature sensor (the temperature signal is a part determinant of
injector pulse width); leaking fuel
injector (s) allowing too much fuel...
Fuel related misfires can be caused by many different things such as low fuel pressure,
faulty or dirty fuel
injectors, a
faulty O2 sensor, a dirty or failing mass air - flow sensor, a
faulty or dirty idle air control valve or a vacuum or intake leak.
The potential causes of Diagnostic Trouble Code P0420 include a damaged muffler or leaks in the muffler, damaged exhaust manifold or leaks in the exhaust manifold, damaged exhaust pipe or exhaust pipe leaks, misfiring in the engine, oil contamination in catalytic converter, a
faulty catalytic converter, a
faulty engine coolant temperature sensor,
faulty front oxygen sensor,
faulty rear oxygen sensor, damaged oxygen sensor wiring, oxygen sensor wiring that is not properly connected, damaged oxygen sensor connectors, a fuel
injector that is leaking, fuel pressure that is high, and other causes.
Hello, It sounds like you may have a
faulty fuel
injector at cylinder # 1, a
faulty crank sensor or potentially a vacuum leak.
When a car is hard to start when it is warmed up or hot, it's typically due to a fuel system issue; ranging from a mass air flow sensor that is
faulty, clogged fuel
injectors or a throttle...
There are a number of things that may cause the car to hesitate (https://www.yourmechanic.com/services/engine-hesitates-during-acceleration-inspection) when accelerating such as low fuel pressure, a dirty or
faulty mass air flow sensor, clogged or dirty fuel
injectors, a
faulty throttle position sensor or...
The lack of response to the accelerator pedal has quite a few potential causes that would have to be sorted out in a diagnostic including, just as a few examples, plugged fuel
injectors,
faulty oxygen sensors, fuel pump and / or filter, vacuum leaks including that caused by a
faulty EGR system, ignition system malfunctions, bad valve timing if the timing belt or chain is worn or skipped, blocked exhaust (e.g., catalytic converter fails or becomes clogged), a
faulty airflow sensor or throttle position sensor, and so forth.
Leaking fuel
injectors could cause this problem, high fuel pressure, or a
faulty coolant temperature sensor signal...
Loss of power on acceleration can be due to plugged fuel
injectors,
faulty oxygen sensors, fuel pump and / or filter, vacuum leaks including that caused by a
faulty EGR system, ignition system malfunctions, bad valve timing if the timing belt or...
Stalling at idle could be due to a
faulty mass airflow sensor,
faulty camshaft or crankshaft position sensors, worn spark plugs, wires or defective ignition coil (s), inadequate fuel delivery or pressure (clogged fuel filter,
injectors,
faulty fuel pump or pump...
The lack of response to the accelerator pedal has quite a few potential causes that would have to be sorted out in a diagnostic including, just as a few examples, plugged fuel
injectors,
faulty oxygen sensors, fuel pump and / or filter,...
Examples of vacuum leaks include: leaking intake manifold gasket, broken PCV valve or PCV hose, disconnected vacuum line, cracked vacuum line, ripped intake snorkel -
faulty fuel
injector - damaged engine computer (PCM)- low fuel pressure - leaking head gasket - low compression in the affected cylinder - valves that are out of adjustment - bad mass airflow sensor (random misfire).