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Old 05-09-2021, 08:48 PM   #18
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 45,058
 

2003 L-Series 3.0L Sedan
Default Re: Just died 5 times at stop lights...

Spark on one or both coils means the pcm is working. The pcm works only if the crank sensor works. No crank sensor = no pcm operation = no fuel pump, no spark on any coil and no injector pulses making the pcm a door stop. Any spark means the crank sensor is working period. You can verify both coils working by removing all four plug wires after noting firing order. If one coil died, your engine would run but only on two cylinders and very roughly.

In this problem, you should determine whether this is a fuel or spark issue. So far, you verified spark, albeit one coil. You can test the coil by itself or both coils at once. Either way, spark should be seen on both coils to eliminate the crank sensor as the problem. I think you're not moving on to check for a fuel problem as it seems clear to me that spark or crank sensor aren't the problems.
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