99 GMC YUKON won't start

gmc
yukon

#1

99 GMC Yukon, Tried to start this moring and it will not start. It is turning but it will not start, sounds like there is not any spark. 2 weeks ago we replaced the ignition module and the iginition coil.


#2

You can check for spark by removing a plug and wire. Lay the plug against the block and crank the engine. If there is spark you will see a blue flash.

Was the truck running alright after the module and coil change, or is this the first starting attempt since the work was done?

Is the fuel pump priming when you turn the key on? You should be able to hear it for a couple of seconds each time you turn the key to the ON position.

If it is priming, you need to check further along the fuel system for problems.