bnova87

Having a problem with my 2000 Camaro SS after an LQ4 swap. Car ran good for a few days then suddenly cut out when attempting to test drive it. as it is now, the first time I start it for the day it will run long enough to pull it in a bay but gets worse and runs for shorter amount of time after that until it just won’t start up at all or will start and immediately die.

I’ve got good fuel pressure, injectors are firing.
I have no spark. I replaced the crank sensor today, it started immediately much faster than it has been but died after about 15 seconds. On my Scantool i can see rpm and cam sensor counts while cranking. I have 12v at the coil harness and each coil. Any ideas?

bnova87

Also, I’ve been searching through threads here and on other sites trying to find something related and haven’t really found something close to what I’m dealing with.

G Atsma

Check all your ground connections, mainly those in back of the heads.

bnova87

I’ve got the grounds In the back of the head, the main battery cable ground on the block on the passenger side and one on the drivers side from block to frame rail.

G Atsma

You have them, but did you check for good connections? They might have worked loose if they weren't tightened good initially

bnova87

Grounds are good