Ignitor coil test, interesting results....

[mzdfc3s]

so this is an update to my ongoing problem with lean a/f reading approaching wot and open loop control. i decided that since i wasnt getting anywhere on here and the cpu wont through a cell that ill have to check everything manually. got the multimeter out and tested injectors-ok, maf-ok, then got to the ignition. both coil packs-no reading at all?? #1 high tension lead read 3.12 Kohm(this should read from 5-12 Kohm), and #3 high tension lead read 0. WTF????? how does this car still start, and run ok to a point (wot) with these readings? or do they just mean that they are functioning, but not where they need to be?? but this goes back to when i posted a few weeks ago and someone did suggest that the coils were bad, maybe this is it???????

 

[ZenProtege]

how exactly did you test the coils?

 

[mzdfc3s]

how exactly did you test the coils?

as instructed by the shopmanual- hooked the multimeter up to the outputs on each coil. say coil one charges cyl 1 & 3, manual says to ceck resistance connecting from the high tension lead to the boot that goes down into the cylinder head to connect to the spark plug.

 

[Brian MP5T]

It should be 1,4 and 2,3...

 

[mzdfc3s]

It should be 1,4 and 2,3...

well, it was just for reference.nothing specific, but you get the idea.and i retract what i said about the high tension leads, i had them backwards and wasn't getting an accurate reading, they are both ok, but checked, re-cheacked, and double checked the coils and cant get them to read resistance at all. i even checked continuity on them and the multimeter that i had sends a 2 Kohm load through the circuit and measures the amount that doesnt come back on the other side, and both packs read 2 Kohm.which tells me that there is a short somewhere in the coils, still just a guess....im really not too knowledgable on ignitions....

 

[Brian MP5T]

Both 1,4 and 2,3 fire each revolution. It's the valve timing that sets which is what "stroke"

Just FYI.. that's why there is only one trigger wire for each coil.

 

[ZenProtege]

Try measuring the resistance without probing through the plug wires. Just measure the resistance through the coil by itself through where the plug boot connects. See if you can get a reading that way. Then compare the reading of the two coils. If they have a much different ohm reading from eachother that's a good indication one is faulty. I would check the wires too. I think it's suppose to be around 7k or 9k ohms of resistence per foot of wire.

 

[mzdfc3s]

Try measuring the resistance without probing through the plug wires. Just measure the resistance through the coil by itself through where the plug boot connects. See if you can get a reading that way. Then compare the reading of the two coils. If they have a much different ohm reading from eachother that's a good indication one is faulty. I would check the wires too. I think it's suppose to be around 7k or 9k ohms of resistence per foot of wire.

yeah i checked em that way too. wires read fine, one was 3.5 or so and the other about 9. and they are both within there ranges because each one is different. i cant get either coil to read and that really doesnt make any sense? the continuity test shows that there must be a major short inside them somewhere but if that were the case i dont see how they would work at all? maybe they are just burned out and start to arc under certain conditions...i really dont know what is going on??

 

[iracemine]

If you read the manual it says to test 1 and 4 together, and then 2 and 3 together. What the hell is 4? I got 7.8 between 1 and 3 and then 8.3 between 2 and 3 so I think I am ok, but just wondering???