So i just finished my cam swap in my z28. Got everything back together and started it up after adjusting the rockers 5 times. It ran and backfired out of the exhaust and intake smoothed out a bit but when i would give it gas it would backfire out of the intake. Not badly just enough to hear it. And i shut it down restarted it and it was smooth as ever. Reved great no backfiring nothing. Shut it down and restarted it and it started acting up again. Then after that it would just crank hit once or twice like it wanted to start then just continue cranking. No matter if i gave it gas or didnt it wont start. Checked for spark at the coil and didnt have any but the battery was low by that point from all of the cranking.

I cant complain if it is my opti cause it has over 260k miles on it and was still kicking hard before the cam swap. I did also get alittle antifreeze on it. So thats why im guessing opti

 

Just checked i have spark at the coil and orange spark at the plugs i dont get it im ready to push this damn car off a cliff

 

Did you check for codes? Have you checked the fuel pressure?

 

Only codes i was getting was 28 and 66 i dont have a fuel pressure gauge anymore it went missing. But i hear my fuel pump priming. Fred what does good hot spark look like coming from an lt1 thats running great? I dont think orange is the correct color