Ls swap won’t start by itself, but with like 10 seconds of starter fluid it runs like a champ. Once engine is warm it will start almost faster then I can turn the key, but the second it starts to cool back down it struggles or just won’t even start. I read that it could be injector related. Unsure what to check first as I unfortunately can only work on the car on saturdays as it is at my dads shop and I can’t interfere with their work.


Edit: I believe the fuel pump is fine as I hear it running the entire time while trying to crank and for a few seconds after. Any advice would be greatly appreciated.

Another edit: the voltage drops a lot when starting so idk if I just need a bigger battery?

 

What are you using to control the engine? Might be something related to cold startup fuel enrichment if you're sure your pump is running during cranking.

 

im using the factory computer that the motor came with, tuned of course as I have a stage 2 cam.

 

Make sure your injectors are working while starting. Sounds like it isn't getting any fuel until it runs when the key goes to run..

 

thanks, I think it was a tune issue with the cold start fuel enrichment. And I think the computer fixed itself as it works just fine now for some reason.