Posted by jimg.allentown on March 03, 2020 at 14:20:41 from (24.115.193.250):
In Reply to: chevy s10 posted by dale2 on March 03, 2020 at 07:47:32:
Forget about the crank position sensor. If it fails, the engine will not run. It cannot possibly affect only 2 cylinders without affecting the other 2.
Among the possibilities:
possible a bad ignition module. Assuming that it has a driver for EACH coil in the coil pack.
Possible bad driver in the PCM.
Here is how it works. The PCM reads the crank position sensor for a reference to cylinder #1. Then, the timing signal is synthesized and the signal is sent to the ignition module. The ignition module amplifies the timing signal and triggers each coil pack when it is time for that cylinder to fire. Some engines also use the cam position sensor to determine if the cylinders are at compression stroke or exhaust stroke. They also use the cam sensor to time the injectors firing.
since you have switches the coil packs, the problem would seem to be either the ignition module or the PCM or a broken or shorted wire between the PCM, the ignition module or the coils.
I repeat, it is NOT POSSIBLE for the crank position sensor to only affect 2 cylinders.
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