Skip to main content ↑ ↓
Topic: 3 plug duraspark (Read 1861 times) previous topic - next topic

3 plug duraspark

can anyone tell me why there is a 3rd plug on my duraspark ignition.dont they normally have 2?

this is on a 1983 3.8 v6 thunderbird
Never drive faster than your guardian angel can fly.
:birdsmily: :birdsmily: :birdsmily::birdsmily: 
  [SIGPIC][/SIGPIC]
:birdsmily: :birdsmily: :birdsmily::birdsmily:
1983 base model,1969 302 (originally a v6),upraded c5,currently 30,441 original miles.

3 plug duraspark

Reply #1 –
My 84 shop manual shows the Duraspark II and III modules as both having two plugs. The II having a blue grommet with 6 wires and the III having a brown grommet with 5 wires.

However it also shows a module with a third plug identified as the "spark retard input". They don't identify what ignition system this module is used on.

3 plug duraspark

Reply #2 –
thanks for the reply Soft

I think I found the answer to my own ?

I found this on a webb site

"Some 1978 and later engines use a special Duraspark Dual Mode ignition control module. This module is equipped with an altitude sensor, and an economy modulator. This module, when combined with the additional switches and sensor, varies the base engine timing according to altitude and engine load conditions. Duraspark Dual Mode ignition control modules can be identified by the three wiring harnesses emerging from the control module."

has anyone heard of this?
Never drive faster than your guardian angel can fly.
:birdsmily: :birdsmily: :birdsmily::birdsmily: 
  [SIGPIC][/SIGPIC]
:birdsmily: :birdsmily: :birdsmily::birdsmily:
1983 base model,1969 302 (originally a v6),upraded c5,currently 30,441 original miles.

3 plug duraspark

Reply #3 –
sweet.  What color is the plug though?  Is it still blue?
84 TC 302 -5.0L/t5/7.5 locking rear and a 3.45 gear, Edelbrock Intake, Aluminum Heads, Edlebrock 65mm Throttlebody, Edlebrock Cam, 24lb injectors & MAS Air Sensor calibrated via chip,  BBK headers, Catback H pipe, Magnaflow lers :evilgrin:
:pics-stfu:

 Project Thread with pics

3 plug duraspark

Reply #4 –
Quote from: blu84302;199368
sweet.  What color is the plug though?  Is it still blue?


 
not sure,i will be checklng it this weekend
Never drive faster than your guardian angel can fly.
:birdsmily: :birdsmily: :birdsmily::birdsmily: 
  [SIGPIC][/SIGPIC]
:birdsmily: :birdsmily: :birdsmily::birdsmily:
1983 base model,1969 302 (originally a v6),upraded c5,currently 30,441 original miles.
 

3 plug duraspark

Reply #5 –
Quote from: Chooglin;199354

"Some 1978 and later engines use a special Duraspark Dual Mode ignition control module. This module is equipped with an altitude sensor, and an economy modulator. This module, when combined with the additional switches and sensor, varies the base engine timing according to altitude and engine load conditions. Duraspark Dual Mode ignition control modules can be identified by the three wiring harnesses emerging from the control module."

has anyone heard of this?


Yep, Pop had a '79 Cougar with the three plug Duraspark module... Should have a yellow grommet...

Was bought new from my uncles dealership in WV... Guess that's why it was considered a high altitude vehicle...