OMH testing secondary coil winding question.

twoie · Post by **twoie** » March 15th, 2007, 9:01 pm

I believe my coil has left me. But before installing mod I'm trying to verify it is indeed taken a crap. On page G-027 there is a pic, but I can't tell what the right hand (not the one labeled A) lead is pointing to. Is this pointing to the rotor?

Thanks

twoie

PATDIESEL · Post by **PATDIESEL** » March 16th, 2007, 10:46 am

huh, the V6s didn't come with an external coil so I'm guessing you have done an external coil mod?...

ariesdude · Post by **ariesdude** » March 16th, 2007, 12:43 pm

If you are talking about the second picture on G-027 - no its not pointing to the rotor. Its the high voltage post that sticks out into the distributor cap. Once you take the cap out you will see that post (with a small metal hat) sticking out above all else.

twoie · Post by **twoie** » March 16th, 2007, 12:43 pm

Pat thanks for responding. I Haven't put the external coil on yet. I was trying to verify this is what I need by following the online shop man. On page G-027 it shows testing the primary and secondary coil winding. I was just a little ( still am ) confused as to what they are pointing to on the right hand side of the pic.

twoie

twoie · Post by **twoie** » March 16th, 2007, 12:48 pm

airesdude Thanks I posted a reply before I seeing your response. Clears it up

By doing the test seems my coil is testing out of range and is prob the reason for missfires and poor fuel economy. When I pulled the cap off the "packing" just fell apart. Can I just use RTV or should I get the seal ( packing ) from Mazda

twoie

PATDIESEL · Post by **PATDIESEL** » March 16th, 2007, 10:39 pm

I don't understand what "packing" you are talking about. Are you meaning to say the rubber seal around the disty cap?

I have had a hard time testing the coils on K series distys. Seems that I cannot get a good reading whether they are bad or good coils. So it Might not be the coil, but I don't know what else to suggest unless you know someone with a good K8 disty that wouldn't mind letting you try their disty on your car to see if it solves the issue. GL

ariesdude · Post by **ariesdude** » March 17th, 2007, 1:27 am

Did you test it with the disty still attached to the engine? Take it out completely and test it. I agree with pat - its a good idea to get a known good disty - it will definitely help you localize the problem. One common problem with our distys is a bad ignition module - search for HEI mod.

hgallegos915 · Post by **hgallegos915** » March 17th, 2007, 2:47 am

He means the "coil pack" aka the "coil" thats inside the disty? maybe hes asking how to get it tested?

PATDIESEL · Post by **PATDIESEL** » March 17th, 2007, 3:39 pm

Yeah, I understood that. The coil was difficult for me to test, but I don't see how having it in the car would effect anything. It was disconnected (not a back probe of the wires), so it should have behaved like the manual sais. Anyway, my first suggestion still stands, find a known good one and see if that is your problem.

twoie · Post by **twoie** » March 17th, 2007, 5:57 pm

Yes I mean the rubber seal. The man. calls it "packing". Can I just use RTV in it's place?

PATDIESEL · Post by **PATDIESEL** » March 17th, 2007, 9:08 pm

You do not want to RTV the cap to the disty, but some sort of seal is a good idea since it keeps debris and water out of the cap.

ariesdude · Post by **ariesdude** » March 18th, 2007, 4:51 am

PATDIESEL wrote:Yeah, I understood that. The coil was difficult for me to test, but I don't see how having it in the car would effect anything. It was disconnected (not a back probe of the wires), so it should have behaved like the manual sais. Anyway, my first suggestion still stands, find a known good one and see if that is your problem.

I was just guessing that if its in the car surrounded by the bulk of engine metal there might be reading fluctuations - especially with the ohmeter using milliamps & few volts to measure resistance. Normal operation shouldnt be a problem because it deals with kilovolts for the spark.

twoie · Post by **twoie** » March 19th, 2007, 12:37 pm

thanks for the replys. Since I don't know anyone with an MX-3 and omh testing the disty in or out of the car still produces the same readings I started adding the coil part of the HEI mod.
I guess the rubber seal for the disty cap will be a dealer item.

twoie