What is a misfire malfunction

1. Faulty fuel injector: A clogged or faulty fuel injector can cause insufficient fuel supply to the engine, resulting in a misfire.
2. Ignition system problems: A faulty ignition coil, ignition control module, or distributor can cause a misfire in the engine.
3. Vacuum leaks: A vacuum leak in the engine can cause an imbalance in the air-fuel mixture, leading to a misfire.
4. Faulty EGR valve: A malfunctioning EGR (Exhaust Gas Recirculation) valve can cause a misfire by altering the air-fuel mixture in the engine.
5. Low compression: Low compression in one or more cylinders can cause a misfire.

To diagnose the specific cause of the misfire in your car, you should take it to a qualified mechanic who can perform a diagnostic test to pinpoint the issue. They may use a scan tool to check for any stored error codes in the car's computer or perform a cylinder compression test to check for any issues with the engine's compression. O

no information generic answer --one one and can cause misfire if not flowing correct amount of fuel

Plug wires

Numerous things can cause misfires. Most common are worn or fouled spark plugs, word, chafed, or improperly routed spark plug wires. Additionally, low cylinder compression can cause misfiring, as can a malfunctioning cam or crankshaft position sensor.

Multiple misfires can be caused by a few different things , intake manifold vacuum leaks , low fuel pressure , basic things like plug wires an spark plugs needing to be changed if hasn't been done already . How many miles on the vehicle ? If over 100,000 K timing chain an gear wear can also cause this . The powertrain control module (PCM) uses information from the ignition control (IC) module and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. By monitoring the variations in the crankshaft rotation speed for each cylinder the PCM is able to detect individual misfire events. A misfire rate that is high enough can cause the three-way catalytic converter to overheat under certain conditions. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for 3-way catalytic converter overheating are present.
If the misfire is random, check for the following conditions:
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System grounds

Ensure all connections are clean and properly tightened.

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Mass air flow sensor

A mass air flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition. Try operating the vehicle within the Failure Records conditions with the MAF sensor disconnected. If the lean or misfiring condition is not present with the MAF sensor disconnected, replace the Mass Airflow Sensor Replacement .

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Damaged accessory drive belt or driven accessory

A damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC.

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Air induction system

Vacuum leaks that cause intake air to bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or malfunctioning crankcase ventilation valve, or for vacuum leaks at the throttle body, exhaust gas recirculation (EGR) valve, and intake manifold mounting surfaces.

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Fuel pressure

Perform a fuel system pressure test. A malfunctioning fuel pump, a plugged filter, or a malfunctioning fuel system pressure regulator will contribute to a lean condition. Refer to Fuel System Diagnosis .

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Fuel injectors

Refer to Fuel Injector Solenoid Coil Test .

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Water contamination in the fuel system can cause a single cylinder to misfire as well as cause a random misfire, refer to Alcohol/Contaminants-in-Fuel Diagnosis .

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EGR system

Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

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Extended idle

Excessive Open Loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. This condition is not permanent. To determine if this condition is causing the DTC P0300 to set, review the Freeze Frame/Failure Records for DTC P0300. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC to set. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80?°C (176?°F), the condition described above is very likely the cause of the DTC to set. The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 g/s.

The P0316 DTC code is a generic code that applies to all vehicles. This code means the powertrain control module (PCM) has detected a misfire shortly after startup, specifically within the first 1,000 revolutions. This code may also be triggered with another of the other misfire codes which are P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309, P0310, P0311, P0312. If you have another misfire trouble code also, you should diagnose and repair that code(s) first. Symptoms Symptoms of a P0316 DTC may include: MIL (Malfunction indicator lamp) illumination Rough engine start or idle Potential Causes Potential causes of this misfire code may include: Damaged or defective Crankshaft Position Sensor (CKP) CKP sensor wiring or connector fault Poor fuel quality Ran out of fuel Ignition system malfunction Fuel system malfunction: injector or fuel pump Mechanical engine problem Damaged PCM Possible Solutions First off, you'll want to repair any other misfire DTC codes if present prior to diagnosing this code. If you own a Ford vehicle and you have a P0316 along with one of the other misfire codes, you should check for appropriate TSBs (technical service bulletins), as there are some TSBs that in part involve reprogramming the PCM. Doing that requires specialized equipment. Some Ford vehicles even needed a new cylinder head as a result of the valve. Regardless, if you have a Ford with multiple misfire codes including this one, check for TSBs. If the P0316 is the only code, then it's time to do a bit more diagnosing of the crankshaft and camshaft position sensors, and their associated connectors and wiring. A tip we've found is "Since this code indicates a start up misfire, pay attention to items which may expand or contract when cold (if the code sets when the engine is cold), or hot (if the code sets on a hot restart)." Realistically, the freeze frame data from the PCM will be helpful in tracking down the problem. As will a good DVOM (digital volt-ohm meter), so you can perform tests on the wiring and the sensors.

Read more at: http://www.obd-codes.com/p0316
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wiring faults to coil/s --coil/s --HT leads ---Spark plugs --low fuel pressure --injector wiring--injectors -- faulty injector tips are some of the causes for misfiring. Run the fault codes to check where the fault may lie.

A cylinder misfire means that the fuel / air mixture is not completely igniting / burning -- this could be an intermittent misfire or a misfire on each revolution of the engine.

There are many possible causes for this, among them ::

- bad plug wires
- malfunctioning coil
- fouled spark plug
- clogged fuel injector
- burned valves
- malfunctioning valve lifters
- etc., etc...

I believe this addresses your question -- if not, pls let me know.


Charlie

CODE PO301 - CYLINDER NUMBER 1 MISFIRE DETECTED. POSSIBLE CAUSE- BAD COIL - SPARK PLUG - INTAKE MANIFOLD VACUUM LEAK - DIRTY OR FAULTY FUEL INJECTOR. CODE P1142 - DID NOT SEE. CODE P1545 - THROTTLE VALVE ACTUATOR MALFUNCTION.POSSIBLE CAUSE THROTTLE VALVE CONTROL MODULE FAULTY - THROTTLE VALVE IS DAMAGE OR DIRTY - THROTTLE VALVE MUST BE IN THE CLOSE POSITION - ACCELERATOR PEDAL OUT OF ADJUSTMENT. THROTTLE POSITION ACTUATOR IS SHORTING TO GROUND OR POWER.

P0750 has to do with the Shift solenoid A its a circuit malfunction. Could be related to or caused by the wiring, shift solenoid, or ECM/TCM.

P0755 is also a shift solenoid B issue Circuit malfunction. Possible causes are wiring, shift solenoid, ECM/TCM.

P0765 is also a fhist solenoid D issue Circuit malfunction. Possible causes are in wiring, shift solenoid or ECM/TCM.

Misfire could be result of not shifting right and making vehicle seem as if there is a misfire but only a suggestion. But either way sounds as if you need to consult with a shop that can run tests with computer on transmission issues first.