Well a while ago I bought a set of lightly used injectors from a member here, Jay-M. Im sure the injectors are fine. With the PRS4 they are not being told to send any fuel through I am assuming. This isnt a PRS question but Im wondering what I should be checking for power at the injectors. I am pretty sure there should be some sort of "pulse" either in volts or current. Just trying to figure out why the car wont start and I know fuel is getting to the fuel rail but after cranking and cranking there is no fuel getting through the injectors. Spark is very good, better than ever. Any help would be greatly appreciated as I need the Tib running very soon

 

you should havea rock solid 12-14 volts at the injecors with hte key on
the prs pulses them by applying ground

if you want to do a uqick check get a "noid lght" ,remove one injectors, plug the noid in place and crank
noid should be flashing

 

ok makes sense. should both wires have voltage or just one on the injector plugs? i think i had power at both

 

one wire carries the power (12 volts) the other wire goes to the prs and give ground only when pulsed

but be aware...
with the key on, engine off you will have 12 volts on one side and around 11.8 volts on the other side( if stil lhooked up to the injecteor and depending how you wired up your 4 injectors)

it's the power "leaking trough" the injectors that you read

go get a noid light, it's simle and will help you a lot i think

 

well everyone at autozone looked at me like i was crazy. any ideas of where to go? otherwise tomorrow im going to check with my teacher and see if we have one in the shop i could borrow

 

snap on blue point, lisle carry those for sure
if your in mechanical school i'm sure you'll have some over there

 

Are you still using the PRS? If so, make SUUUUUURRRREE you have a good ground on those ground points. If not, then the injectors will NOT fire.

 

you mean the prs pins jon? ill check that.
ps, noid light does not light

 

Yes. The PRS uses and NEEDS a very solid ground point. *The PRS does not power the injectors* It pules the ground for them. So your injectors should be still attached to the stock power wires, while they get grounded by the PRS. So if the PRS does not have a solid ground, then it cannot fire the injectors.
If this does not make sense, then let me know.

 

no i get what youre saying. i will be working on it tonight and maybe get it running? i hope