i just put the ls in my 00 civic coupe. well at idle it runs fine. but as soons as you give it gas its backfiring threw the intake mani. checked all the injectors they got positive feed to them. all the o2 sensor are fine and plugged. i got all the mani sensor plugged.im pretty sure the distrubitor is wired right. my ecu is throwing a code but dont know how to pull it when you have a obd2 harness with the conversion harness to obd1.. its like when you give it gas its starving itselft of it.
i got good fuel pressure. no fuel leaks. vacuum sits at around 15 which in my d16y8 it sat a 22 same with my bro ls.im pretty sure that the cams and crank are aligned. i spent 7 hours tryin to figure this out. even my ase certified uncle is stumped.we took it for a ride it rides like crap in second and will not go uphill.
some ideals would be great because im all out.

 

mabye check the fuel filter just an idea, I know it will throw a cel if it's bad.

 

this is a rebuilt motor. try to get it running for the first time after the rebuilt. only thing that has changed is the rods and pistons.

 

anybody know how to check the codes with the conversion harness

 

when i check the obd2 ecu the only thing it threw was malfunction vtec. becuase i tried both ecu.

 

before anyone says search i did found many of the exact same probrem but none provide an answere. i guess the got it fixed but never posted what it was.