Theron

iTrader: (1)

It all started with my 85 GSL hard to start. The person that had it last pulled of the rat nest and the choke, so I thought it was fuel. The car would start sometimes and sound like only the Trailing plugs were working and I would rev it up and slowly you can hear sparking happen and then it would smooth out and work fine when warmed up. Eventually I didn't have any Leading spark at all. only Trailing spark.

I put a test light on the negative side of my Leading coil and it has no pulse (on and off signal) it would just stay on and slightly flicker, and also no spark from the plug. My Trailing will pulse on and off and nice blue spark from the plug.

I've checked my coils, there is no resistence. Pick up coils (the gap is fine), rotor, cap, wires, and plugs I also tried replacing the ignitor with another one and it works the same.

I looked at the dizzy and under the pickup coils were some rust, so I took it out and took it apart, clean it and put it back together. Some thing I forgot to do is mark the rotor, so now the timing is off. I allined the yellow mark on the pulley, but how do I allin the dizzy with the rotor.

My Mazda work shop manual say to allin the tally marks on the dizzy shaft with the mark on the gear.
there is a indention on the shaft by the gear and a outward notch on the main shaft. I tried that and nothing.

do you have any advise?

Theron

iTrader: (1)

If anyone knows anything about this ignition please help

Rx-7Doctor

iTrader: (13)

Here is how the dist marks line up when you drop her in making sure that you have the rotor facing the L1 on the cap.. On the replacement ignitor, did you verify that is a working one?

ProjektSE7EN

I had the same thing happen to me. I have an 85 GS. Removed rats nest and it wouldn't start. Replace the RN when I thought I F'ed up! Tried to start it. Would crank, and deliver fuel. Tested coils by using "spark plug test." End result was that trailing coil had spark, but leading coil wasn't firing. I need the Ignition control module "or whatever it is called" that send a signal to the coil. I need the one that controls the leading coil. PN J-109. Its located on the Distributor closest to radiator. Pic posted below!


Hope this helps!

Rx-7Doctor

iTrader: (13)

Nice picture of the ignitor.. He has already stated that he replaced it. I have asked him if he knew for sure that it was a good one...

Kentetsu

I think you also want to make sure that the timing mark for the leading ignition is lined up with the peg at the front pulley when you do this...

Theron

iTrader: (1)

Hey thanks for the info and for that picture, I thought that was the right way to line it up.

I don't know for sure it the ignitor is good. Would a bad ignitor cause a weak spark or no spark or sometimes spark?? I guess I have to make a little wire harness with a switch, light bulb, and a battery to test it.

Do ignitor's go bad all the time?? I thought that it would be something that doesn't happen.
I did aline the dizzy and made sure the yellow mark lines up with the peg
and it tried to start, but still sounded like firing on Trailing only.

Rx-7Doctor

iTrader: (13)

Yes, they do it's a very common problem. Check to see if there is spark at the plug on the leading side now. If there is not the ignitor that you just put in is no good. If there is spark at both leading and trailing now there is a possibility that the pulley is not on correctly. I have found this many times when I bought a 7 and someone replace the water pump or did other work then put the pulley back incorrectly. Since you pulled the dist without aligning the pulley first you don't know if it is on correctly.

Kentetsu, as You can see the reason I didn't tell him to make sure the pulley was at the timing mark is because he stated he did that already.

Theron

iTrader: (1)

ok. Now there is spark for some reason on both leading and trailing, but weak. the car starts but doesn't want to stay running. Time to look at fuel. The choke is not there.

Although before all this happen it was hard to start so I pumped the accelerator a few times without pushing the accelerator and it would start warm up and drive fine.
Now I do the same thing and it won't stay running.

Kentetsu

Sorry Doc, just wasn't sure if he had tried to start it since then and wanted to make it clear when someone pulls this thread up twenty years from now...