No Fuel At Injectors

[pos4g63]

Finally got my 90 gst motor rebuilt and back together. The darn thing won't start. Ive narrowed it down to the injectors.
I checked the fuel pump, its works.
Compression is good.
MPI fuse good(edit).
Injector resistor pack good 6 ohms across the board(edit).
I checked the MPI relay, all is good.
Fuel rail is pressurizing.
I checked the caps in the ecu seems it have been previously repaired.
Im getting 12 volts at all injectors.
All 4 plugs are firing.
Timming is all accurate.
All injectors give me 5 ohms, read it is supposed to be 2-3. Possible they all failed so consistently?
This leaves me with 2 options as far as I can tell, bad ecu or bad cas.
Im doubting its the cas because as far as I know the ecu seems to be firing the plugs so it must be telling the ecu where its at.
Im stumped any ideas or concerns would be appreciated.

 

[-red97rum-]

Hmm, are you sure the injector resistor pack is plugged into the right plug? Not the ISC plug?

Is fuel being sprayed into the cylinder when you crank it over? Can you pull a plug and verify if it's bone dry or soaked with fuel?

Also check the wiring to the coolant temp sensor on the thermostat housing and make sure it's ok. The car can be a bi*** to start if ECU doesn't see the CTS.

Edit: I see you checked the MPI relay. Have you check the MPI fuse that's right on the positive battery terminal?

 

[pos4g63]

The MPI fuse is good. I actually pulled the whole fuel rail off the head , left it all connected up and cranked the car not a drop of fuel, until an injector blew off the rail.

 

[Calan]

Sounds to me like a resistor pack problem, connection between the RP and ECU, or blown ECU injector drivers.

Do you have another ECU you can swap in?

 

[Dsm78]

If you're not getting any fuel spray from the injectors I would try swapping the ECU to verify you have injector pulse.

 

[pos4g63]

I dont have an ecu I can test with. I need an eprom ecu to run link anyways so I guess it is going to get moved up to the top of my list

 

[lostnsand1]

I would check around the local area for another tuner to stop by with a spare ecu and throw it in for you just to check and see. It would help in narrowing down the gremlin.

 

[pos4g63]

trying to get ahold of a known good ecu hope it works.

 

[93dsmwi]

i got same problem i got spark on all 4 cyl and i put on a noid light on the injector plug and there is no pulse at all i got pressure into rail just not comming out injectors swapped ecu and cas and still nothing new ps not trying to steal ## post just saying we got same problem and cant figure it out... any ideas?

 

[dracon8780]

this sounds stupid but when I rebuilt my 1g motor Accidetly reversed the CAS and I was having the same problem
try looking at the CAS if it is reversed it will fire sparkplugs at 180 degrees out of time

 

[pos4g63]

Finally got my car running 5 min ago. I Threw in a new Ecu and it didn't start. So I pulled off my cas to check it once again. When I pulled it off a big hunk of the old wire cover fell off, and I noticed a few bare wires. So I took it apart cut 3 inches of wire off, crimped and soldered on some new connectors and threw it back on. Fired right up

Thanks for all the help.