Ayes

iTrader: (1)

88 na with recent s4 turbo swap, no resistor relay, na harness, with no ground

pulse at the injectors. 12volt at all points on ecu for injectors and at injector clips.

i have spark/ecu ground {in cabin and bay} and fuel at the rail but the injectors

will not pulse, prior to swap the car would literally flood my only thought is that

something simple isn't hooked up right any ideas?

HAILERS

So you have, on the small plug of the ECU, batt voltage at each of the injector wires (plug off the ECU)? And the grounds are good at the ECU plugs. Got me.

Other than the fuel pump isn't running. OR the fuel lines are on backwards. I'd jumper the yellow two pin fuel pump check connector. Key ON. Then pull the Retun fuel line off the engine. Fuel should pour out that line anytime the pump is running. Proves the plumbing is right.

Or........buy a can of starter fluid. Spray for two seconds into the airfilter/afm/intake. No more than that. Then try starting the engine. It should start momentarily, proving that it's indeed a fuel problem. Never keep a engine running just spraying starter fluid. Causes knock if you do that.

Ayes

iTrader: (1)

i have fuel at the rail, i recently replaced the o ring at the top of the injector due to leaks so im sure the pump is running, if the fuel lines were backwards i would be getting no fuel to the rail no? would a bad body harness cause the issue? i separated the na harness loom and all wires/ground connectors are fine, bad engine harness? im about to just rewire the injectors directly to ecu. thanks for the input oh wise one

hanman

do you have 0V at the ground wire at the ecu?
A faulty injector ground will give you no pulse.

HAILERS

************************************************** ************************************************** ************************************************** *

No. Don't rewire anything. Just put the key to ON and pull the small plug off the ECU. Then key to ON and see if there's batt voltage at each of the injector wires. They are light green, light green/black, light green/red, light green/white.

They all should have batt voltage with the key to ON.

You said you have spark so I assume the ECU grounds are good. But while your there at the ECU small plug, see if the pure black wires are grounded or not. Should read 1-2 ohms. Key to OFF when you check for ohms on those pure black wires.

Actually in your first post you indicated you had power and gnd at the ECU. So maybe the above is redundant.

What is the ECU number? N??? Try the stock non turbo ECU. It should start the engine.

I really do believe the problem is you have a JDM engine and have the fuel lines on backwards.

If this is a JDM engine, the fuel lines are different than a USA version. Swap the fuel lines if it's a JDM engine. You should hear fuel flow all the time thru the rails if the key is ON and the yellow fuel pump check connector is jumpered.

You can use a common LED to tell if the injectors are pulsing. The positive lead of the LED to a batt source like the black/white wire on the far left of the small ECU plug. Then the negative LED lead to one of the primary injector wires. Like the light green wire. Then as you crank the engine the LED will go on/off, proving the ECU is pulsing a ground to the injector.

Or pull the plugs off the coil assy's. Then attach your spare CAS to the plug that goes on the engines CAS. Key to ON. Spin the spare CAS with your fingers. You should be able to hear the fuel injectors clicking. You don't spin the starter when doing this, just key ON and spin the bottom gear of the CAS and listen. If you hear clicking, the ECU is opening and shutting the injectors.