Obd2 code p0304

This diagnostic trouble code (DTC) is a generic powertrain code , which means that it applies to OBD-II equipped vehicles. If the engine speed fluctuates enough to cause the Crankshaft Position ( CKP ) sensor signal to vary, the Engine Control Module ( ECM ) can determine that a misfire is occurring.

Turn the ignition off, disconnect the fuel injector harness connector of the misfiring cylinder. When a misfire is detected for a particular cylinder, the PCM will shut down the injector control control circuit for that cylinder. The Misfire monitor diagnostic is based on variation in crankshaft velocity. The PCM determines this information using the crankshaft position sensor and camshaft position sensor.

A misfiring cylinder slows down momentarily,. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code.

Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persists more tests needs to be done to diagnose problem, see Possible Causes. The PCM has detected a misfire from cylinder number 4. The PCM uses crankshaft position, camshaft position, and engine RPM to calculate fuel delivery and ignition timing. Set conditions, t he variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm load. I checked all vacuum hoses okay, checked MAF sensor, okay. I did some search on the forum and it seems that most of the time the culprit is the ignition coil.

But when we take a closer look at the many things that can cause a misfire code it takes shape into a simple system that requires everything to be balanced for maximum. These are stored in response to a problem found in the car by the system. CEL reset miles ago and has not yet turned on again. Vehicle is starting and running smoothly, no stumbling or hesitation and no unusual smoke out the tailpipe. Also I cleared the engine codes with my scanner and without cranking the engine the.

I have eliminated the ignition components by switching the plug wire and coil pack. Thanks in advance for your help and response, this car came in with a slight miss and over heating. We ran a block test and found a blown head gasket. The engine will run fine for minutes then misfire for minutes then run fine again for minutes, then misfire again.

If misfire follows spark plug to different cylinder, replace spark plug. I have noticed by accident that there is a crack in the exhaust manifold right under where cylinder is, and air gets out from it. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. I tried a few basic things like swapping the plugs and the coil pack on top and the boot from number which had no effect.

It may be that you are using a generic OBD -II reader and it can not properly read a BMW proprietary code (as opposed to the DOT mandated generic OBD -II codes ). When this happens, the code reader will typically give a false code number. Ignition system Fuel injectors Fuel pressure Running out of fuel EVAP canister purge valve Evaporative emission system Low compression Base engine problems Controle Module damaged Special Notes. This feature search for engine misfire in a specific cylinder. The check engine light went off for about days then came back on.

These codes are from PowerTrain series (P0XXX, P2XXX, P34XX), Body Series (B0XXX), Chassis series (C0XXX), Network series (U0XXX, U2XXX, U3XXX). We believe in function and style. The timing position of the camshaft is controlled by a cam phaser that is part of the camshaft drive gear or sprocket. Will report back 277C - P114A Information saved in Fault code. Table of generic OBD-and EOBD codes.

My service engine light will come on an off periodically with the truck running a little rough. If the misfire is still there with wires from the good cylinders try switching the boots or whatever your truck uses. Reset the ECU but MIL came back after 1miles.

Tried two more times and came back twice. Car seems to run well and light will come and go. Light and codes have returned. I guess a smoke test is in my. Interchanged the coil pack with another cylinder and cleared the code but the code returned the same which one would think eliminates the coil pack as the problem.

In this manual you will find code listings, symptoms, illustrations and corrective procedures. Cylinder Misfire Detected. Diagnostic Trouble Code Chart. BDModule Trouble Code Comprehensive List Gas and Diesel PC.

M - TCM - BCM - DDM - IPC - EBCM (ABS) - CANBUS Messaging. The first letter indicates the type of code : P = Powertrain. U = Network Communication. The remaining 4-digit number specifies the problem within that system. Below you will find a list of the most commonly used codes.

Boxster OBD -II Fault Code Listing. OBD Code is cleared but check engine light will not RESET? Engine Mechanical: Misfire Troubleshooting The mechanical health of the engine is one of the most overlooked causes of a misfire. Recalling that all engine cylinders need air, fuel and spark. Air’ part of the equation.

Volkswagen Eurovan OBDII Readers OBDCode Tool Scanner This is what your family and friends would admire to get in every time it’s moving out of the parking bay. The 16” front wheel vehicle is undeniably the best family size vehicle for weekend outdoor activities. This page lists OBD -II generic powertrain trouble codes , a. Well, these are the most common codes. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-days. Please note this troubleshooting manual covers the engine codes only and not the truck chassis.

If something goes wrong, a technician (or you if you have a $code reader) can plug into your car, and will get a numeric code telling them what is amiss.