Replaced wiring harnss/underhood. Rplaced pcm. replaced coil pak. I still have nothing . After replacing all those componets the car cranked and ran great for about 5 seconds . nothing since , no fire . What do you suggest ?
Make sure the cam sensor is plugged in properly, located on the drivers side on the side of the head, if is is I would check make sure the cam is turing, if is is it could possably be the timeing is out on the belt
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Check the ASD relay in under hood fuse/ relay box. ASD stands for automatic shut down relay. Powers up pcm ,fuel injectors and ignition system an O2sensor heaters .crank over the car an check for power at O2sensor heater fuse in the underhood fuse box ,no power means bad relay !
Do you know for a fact cylinders one two and four are firing ?
The codes are for circuit problems with the coils on those cylinders. The coils get power from the PCM power relay and the engine computer grounds each coil to fire the spark plug. The codes mean the coils are not firing, and since you replaced the coils there may be too much resistance in the circuits coming from the computer.
Random misfires usually happen when the spark jumps from one wire to another out of sequence. The cause can be bad wires or you can have a cracked coil-pak. The coil-pak can be bench checked at some autoparts stores. Another possible problem is the Crankshaft sensor which lets the engine know the position of the crankshaft before firing the sparkplug.
Sometimes you can observe the wires arcing when the engine is running in the dark. You may also be able to mist the engine with water using an old spray bottle. The wires should be well enough insulated to withstand the extra water and if the wires don't they need to be replaced.
The Code for a Random misfire may eventually set to the problem sparkplug wire or plug. Even knowing which side of the engine is causing the misfire can help to narrow down an individual coil-pak or wire.
CHECK IGNITION COIL FUSE.IF FUSE OKAY.YOU REPLACED COIL POWER TRANSISTOR. OTHER POSSIBLE CAUSES YOU NOT GETTING SPARK COULD BE FAULTY CAMSHAFT SENSOR AND CRANKSHAFT SENSOR ALSO FAULTY PCM.BEST TO CODE SCAN CAR BEFORE BUYING NEW PARTS.