Is LED testlight really req'd??

[974drexp]

I am still having my no start issues although now they seems to be here to stay not intermitant.

It seems as I don't have spark. I removed two plugs and grounded them and when cranking, there was no spark.

I tested the coil and the resistance values are within spec and there is constant power getting to the coil. To test if there is a signal coming from the computer, it states in the Haynes manual that I should only use an LED test light to not damage the PCM. Why? Just because it will be lower wattage?

Andrew

 

[ExplorerDMB]

LED test lights are great, but I wouldn't even use one on a computer. I would use a DMM (Digital Multi-Meter) because a test light is basicaly grounding the circuit. A computer will see this and throw a code or possibly get damaged. Granted LED test lights don't pull a lot of current, but computers are very delicate and with computers being so precise, I wouldn't trust it. I would use a DMM for sure with some back probes. Just my opinion.

-Drew