Ignition Modules

[CSH-HQ]

Manufacturers play all sorts of games with part nos..  Sometimes to track 
vendors, some internal part changes, some various slight qulaity changes, 
etc..  Specicially on new cars to track warranty rates.  While there may may 
be no control in one the quality of component can cause problems at high=low 
temps.
Bruce

>Ok..I have a question for you guys.
>
>Now this is more directed at parts/construction knowledge than ECM hacking, 
>so you EE's put yer thinking hats on :-)
>
>I have a 1986 Buick GN, many years ago I had a ignition module fail. 
>Aftermarket sources listed the same part for the NA and Turbo cars, where GM 
>listed seperate numbers. I think this is similar to the MAF debate. 
>Aftermarket generalizes them. Knowing theres no real *control* in the module 
>(the ECM pulses or varies voltage on (DC%) the EST wire for timing 
>adjustments right?) What could be different in these modules. Seems after the 
>swap, (I used an aftermarket one) my car seemed more prone to ping (although 
>it could be my imagination). Just kinda got me thinking if there WERE any 
>timing references in the module, or maybe the crank TDC offset was in the 
>module (I know theres a setting in the prom, but I'd think that assumes you 
>got the right module right?) Anyone have any insight? Dan SMith? Fred B? you 
>guys seem on a component level as well as a programming level...any thoughts?
>
>Jim
>