miss fire help
10-21-2018, 09:44 PM
#11
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Ok thanks I know it sends a ground signal to the ignition coil which I was speaking about when I said I got no signal from the coil pack on towers 2&6 with the test light. So the crank sensor should be ok or do I have to do some checking there as well? Thanks for your reply.
10-22-2018, 06:57 AM
#12
Mark
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#3 misfire and #2 injector circuit ..
10-22-2018, 09:28 AM
#14
LightningRod
P0353 is electrical 'circuit related' for cylinder 3 (not 'technically' a misfire') just like P0202 is 'circuit related' for cylinder 2 injector. In both cases - the PCM is not seeing electrical continuity before activating the circuit or proper electrical response from activating the PCM output for that circuit.
10-22-2018, 05:06 PM
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P0353 is electrical 'circuit related' for cylinder 3 (not 'technically' a misfire') just like P0202 is 'circuit related' for cylinder 2 injector. In both cases - the PCM is not seeing electrical continuity before activating the circuit or proper electrical response from activating the PCM output for that circuit.
10-22-2018, 11:42 PM
#16
LightningRod
I did not want to suggest that. But regrettably it IS a possibility since you have tried replacing the coil pack. There are not a LOT of possibilities.
Cyl 2 - 6 are two coil posts that fire together, thus they share a common control wire. (you reported 2 & 6 misfire) And the code points toward a circuit (electrical) problem, and not failure of spark in the cylinder failing to cause ignition. Your coil pack has 4 'primary' wire connections. One is common +12 volts (my documentation indicates that is pin 4 - HOT when Key On). Pins 1, 2, & 3 are control wires for the three pairs that fire together in pairs, driving secondary posts 1-5, 2-6, 3-4.
The PCM simply grounds the coil pack control wire (1, 2, or 3) to fire that coil secondary and plugs in pairs. So check the coil pack control wires back to the PCM carefully. Even through the large plug at the PCM / clean it and reconnect it. They should have +12 volts on them with Key On. Actually, if you 'pin *****' one of those control wires, you can jumper it to ground and 'artificially' cause the respective spark plug pair to 'SPARK'. (It will not hurt the PCM, as that is all it does when its running.) That is a test you could do to isolate the problem toward the PCM. Just connect two spare plugs into wires 2 & 6 and ground the plug threads to 12v ground. Then ground the pair's control wire momentarily to ground and verify the plugs both spark.
Cyl 2 - 6 are two coil posts that fire together, thus they share a common control wire. (you reported 2 & 6 misfire) And the code points toward a circuit (electrical) problem, and not failure of spark in the cylinder failing to cause ignition. Your coil pack has 4 'primary' wire connections. One is common +12 volts (my documentation indicates that is pin 4 - HOT when Key On). Pins 1, 2, & 3 are control wires for the three pairs that fire together in pairs, driving secondary posts 1-5, 2-6, 3-4.
The PCM simply grounds the coil pack control wire (1, 2, or 3) to fire that coil secondary and plugs in pairs. So check the coil pack control wires back to the PCM carefully. Even through the large plug at the PCM / clean it and reconnect it. They should have +12 volts on them with Key On. Actually, if you 'pin *****' one of those control wires, you can jumper it to ground and 'artificially' cause the respective spark plug pair to 'SPARK'. (It will not hurt the PCM, as that is all it does when its running.) That is a test you could do to isolate the problem toward the PCM. Just connect two spare plugs into wires 2 & 6 and ground the plug threads to 12v ground. Then ground the pair's control wire momentarily to ground and verify the plugs both spark.
10-23-2018, 07:45 PM
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I did not want to suggest that. But regrettably it IS a possibility since you have tried replacing the coil pack. There are not a LOT of possibilities.
Cyl 2 - 6 are two coil posts that fire together, thus they share a common control wire. (you reported 2 & 6 misfire) And the code points toward a circuit (electrical) problem, and not failure of spark in the cylinder failing to cause ignition. Your coil pack has 4 'primary' wire connections. One is common +12 volts (my documentation indicates that is pin 4 - HOT when Key On). Pins 1, 2, & 3 are control wires for the three pairs that fire together in pairs, driving secondary posts 1-5, 2-6, 3-4.
The PCM simply grounds the coil pack control wire (1, 2, or 3) to fire that coil secondary and plugs in pairs. So check the coil pack control wires back to the PCM carefully. Even through the large plug at the PCM / clean it and reconnect it. They should have +12 volts on them with Key On. Actually, if you 'pin *****' one of those control wires, you can jumper it to ground and 'artificially' cause the respective spark plug pair to 'SPARK'. (It will not hurt the PCM, as that is all it does when its running.) That is a test you could do to isolate the problem toward the PCM. Just connect two spare plugs into wires 2 & 6 and ground the plug threads to 12v ground. Then ground the pair's control wire momentarily to ground and verify the plugs both spark.
Cyl 2 - 6 are two coil posts that fire together, thus they share a common control wire. (you reported 2 & 6 misfire) And the code points toward a circuit (electrical) problem, and not failure of spark in the cylinder failing to cause ignition. Your coil pack has 4 'primary' wire connections. One is common +12 volts (my documentation indicates that is pin 4 - HOT when Key On). Pins 1, 2, & 3 are control wires for the three pairs that fire together in pairs, driving secondary posts 1-5, 2-6, 3-4.
The PCM simply grounds the coil pack control wire (1, 2, or 3) to fire that coil secondary and plugs in pairs. So check the coil pack control wires back to the PCM carefully. Even through the large plug at the PCM / clean it and reconnect it. They should have +12 volts on them with Key On. Actually, if you 'pin *****' one of those control wires, you can jumper it to ground and 'artificially' cause the respective spark plug pair to 'SPARK'. (It will not hurt the PCM, as that is all it does when its running.) That is a test you could do to isolate the problem toward the PCM. Just connect two spare plugs into wires 2 & 6 and ground the plug threads to 12v ground. Then ground the pair's control wire momentarily to ground and verify the plugs both spark.