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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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.
Click on the link. Voltage for fuse 18 comes from, pcm power relay. Terminal 30, load side of relay is fuse protected and hot all the time. If you unplug that relay and use jumper wire between terminal 30 and 87, fuse 18 should go hot. That should mean, the control side of relay has a problem, The control side needs voltage and ground.
The PCM - engine computer has drivers or transistors inside that control the coil's . Three wire's to the coil . One dark green with orange trace is power , should have B+ voltage . The black with gray trace is control side from PCM . for # 1 coil . Testing with a test light . Videos on youtube .
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 engine light on ? Code's ? What engine ? 2.3 l 4cylinder or 3.ol v-6 This vehicle has coil on plug ignition system , not coil packs ! a coil per cylinder . If new coils an still has no spark , has no B+ voltage to the coil or the PCM isn't controlling them . Without testing i'd only be guessing as to the problem .If the repair shop you had it to can only say it had to be the coils , I'd find another shop to take it to ! Autolite Coil on Plug Ignition troubleshooting
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.