[Tyler Townsley]

Having chased DIS problems/differences for 2 years in getting Queenie running I can try to add some notes that helped me. A DIS module has 2 modes, under 400 rpm and over 400 rpm. Under 400 it runs on an internal logic ckt then transitions to the ecm control ckt. If you use a dis checker you can see on a scope the breakdown of the DIS if that is the problem. The car does not run when using this tester. I like to put a plug in each wire and lay them on the plenum. This does 2 things, it allows you to see the rhythm or lack of it. It also allows you to see if a specific plug has a weak spark.

http://thepandatrap.com/tyler/prototype1/90_ign_mod.jpg
http://thepandatrap.com/tyler/prototype1/page09.jpg
http://thepandatrap.com/tyler/prototype1/page11.jpg
http://thepandatrap.com/tyler/prototype1/page12.jpg
http://thepandatrap.com/tyler/prototype1/page13.jpg
http://thepandatrap.com/tyler/prototype1/page14.jpg
http://thepandatrap.com/tyler/prototype1/page15.jpg
http://thepandatrap.com/tyler/prototype1/page16.jpg
http://thepandatrap.com/tyler/prototype1/page17.jpg
http://thepandatrap.com/tyler/prototype1/page18.jpg
http://thepandatrap.com/tyler/prototype1/page19.jpg
http://thepandatrap.com/tyler/prototype1/page20.jpg
http://thepandatrap.com/tyler/prototype1/page21a.jpg
http://thepandatrap.com/tyler/prototype1/page22.jpg
http://thepandatrap.com/tyler/prototype1/page23.jpg
http://thepandatrap.com/tyler/prototype1/page24.jpg
http://thepandatrap.com/tyler/prototype1/page25.jpg
http://thepandatrap.com/tyler/prototype1/page25b.jpg
http://thepandatrap.com/tyler/prototype1/page26.jpg
http://thepandatrap.com/tyler/prototype1/page27a.jpg
http://thepandatrap.com/tyler/prototype1/page28.jpg
http://thepandatrap.com/tyler/prototype1/page29b.jpg
http://thepandatrap.com/tyler/prototype1/page30.jpg

Not sure you have the above for reference. I will be at Britts next week moving Queenie from Detroit to the NCM for display and will have the checker with me. The advantage of this is you can run the complete DIS ckts with the plenum off the car and watch the signals on a hand held scope.

I tend to think the problem is not with the dis rather a leaking injector. I would start the car for about 5 sec and turn it off and pull the plugs looking for 1 that is wet/damp. You can then chase the spark or fuel delivery of the actual offending cyl.

Tyler