bent3

I replaced the injectors in my 331 today with 42lb ford injectors im not for sure what it had they look like summit injectors not for sure they are black on top aluminum on bottom 3 big spray holes in bottom the only numbers i can find are on top where fuel rails go 2766 then where it gets fat is 01D127B it idled fine before i changed them now it idles from 500 to 1500 and it will die when I trie to start it back i have to give it gas it acts like maybr its getting to much gas i put a mass air meter calibrated to the 42lb injectors also if anyone could help i would appreciate it

mjr46

if it's just a N/A 331 the 42 lber's are to much!!! 30 lbers max if it's wild enough

bent3

it has a vortech S trim supercharger i noticed alot of people were running 42lb im not sure what i took out there aftermarket what should my fuel pressure be key on engine not running? key on engine running?

Novipowered5.0

Set it to 39-40 lbs at idle with the vacuum line removed and plugged.
Your best bet will be to have it dyno tuned to dail it in.
Good luck!

greenstreak9205

well first of all, did you change you MAF to accept the 42#ers? if you have a mass air car that is

bent3

yes i bought the injectors and maf together in a set

1991LX5.0

you probably just need a tune. When i first put my new MAF/42lb injectors on i had the same problem. The idle would surge from about 600 to 1300 when i came to a stop and after the tune my idle levels out perfectly. Your probably just loading up on fuel, does it smell real rich?