Close on 1996 GMC Yukon

engine turns over but , no spark, no obd2 reading

Asked by for the 1996 GMC Yukon
By no OBD2 reading do you mean no light on as you drive or no communication with a scan tool. Does the Check Engine Light come on when the ignition key is turned on. Have you a repair manual. Autozone have some popular workshop manuals for free on line once you register (for free) on their website or there is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try
and get an online repair manual subscription.