backfire through carb

[HorsesNHogs]

hello again all,
I am sure this is addressed some where here, but I cant seem to get my search to turn up the right stuff. sooooo please help.
I have a 66, 200, 3 speed, I have upgraded to the H/W 2v, completed the 68 distributor upgrade, with the new stock ignition module.

now overall, the mods work great. I have an occasional issue with the car not wanting to start, and then backfiring through the carb, really it just spits out white smoke, then it will normally start up. Once it is running everything is great, no hesitation, great pickup. But the backfiring has me worried.

Another symptom seems to be that when starting, the car will not actually kick over until I release the key from the 'starting' position.
in other words, I can hold it in start and the motor will turn, and turn, and turn.....but will start as soon as I release the key. (most times that is)


could I have crossed some wires on the module? or missed something in the install? I have driven it like this for over a month.
thanks for you help.
gjt

 

[mustang6]

A good test for what I am proposing would be to turn your key to the "on" position and then turn the engine over with a remote starter switch or a pair of pliers across the solenoid (not using the key). If it fires right up, then you have the problem I am guessing. I am guessing your ignition is wired into a voltage source that is hot in the "on" position but not in the "start" position. You are starting the car only after releasing the key to the "on" position.

When I put the DSII setup in my 65 Ranchero I had the same problem. Since I was looking for a 12V source that is hot both during "on" and "start", I had to go the back of the ignition switch (much easier to do with the dash out by the way) and find the point where the pink resistor wire connected. I unplugged that from the switch, plugged in my ignition power wire as a replacement, and now I no longer have the problem you are describing.

 

[HorsesNHogs]

Mustang 6,
thank you for the fast reply,
This may well be my problem, as I did struggle hooking the wires in at the ignition, and may have not found the proper wire,
As I understand the instructions and your advice I need to have a 12v source that is only hot in the START, not in Run?
What I have then is a HOT in run only, so I only CATCH a spark when I release the key, I will grab the old multimeter, and pull the instrument panel and find the right wire this time, I am confident it will fix it.
thanks again.
GJT

 

[Anonymous]

If you look at the back of a universal ignition switch it will have 1 post marked "ign" this is the only post that is hot in both the 'on' position and the 'start' position and also not be hot in the 'acc' position. Stock switch ought to be set up similar.
Now i ain't sure of this but i seem to remember if you have the wires on the solenoid wrong you can also get this symptom on some year Fords.

 

[HorsesNHogs]

Well, finally had a day to get out and rewire the switch, But still goofed it.
Seems I choose the hot only in start wire this time! Not the Pink resistor wire, like 'DanWagon' suggested. She Kicks right over but won't stay running, obviously.

but of course I had reassembled every thing prior to testing, I was so frustrated, I just called it a day.

Now my question for 'danwagon' is did you leave the pink resistor wire unhooked and just plug in the hot wire for the module?

I will be out there again tomorrow to try it, just don't wanna burn something up in the process.
thanks again for the help
GJT

 

[HorsesNHogs]

well, as usual, all it takes is a little preserverence and you can find about anything you need in this forum.
Such as this from Mustang Steve. http://www.mustangsteve.com/conversion.html
The perfect little color wire diagram of the conversion.
but still does not answer the question whether I can completely unplug the resistor wire?
GJT

 

[61Futura]

In his drawing, no you can't disconnect the pink resistor wire. That is all that powers the 6 volt coil with the key in the run position. If you use a 12v coil, just add a wire from coil + to the Duraspark red wire. Then you can leave or disconnect the pink wire. I'd just leave it alone.

Steve