no spark gmc yukon
 

Hi
i need some help. i own a 97 gmc yukon, with a 350 vortec.
i was driving down the road and when it went to shift i heard a bang and then it back fired.
when i got it home it had spark and would turn over but would not start. now that its been home i nolonger have spark adn when it turns over its like when the starter catches to start it it stops.
but i didnt throw a rod. and suggestions?

Thank you
Emily

RE: no spark gmc yukon
 

Doesn't sound real good,no....I bet something let go inside...better get the compression checked

RE: no spark gmc yukon
 

Sounds like it has jumped time, check the timing chain.I have also seen the EIC's go bad and you get no spark. EIC( electronic ignitioncontrol module )