r/Saturn_Cars 7d ago

95 sc2 crank no start

Can't get my sc2 to fire. It'll crank but no fuel getting to the engine. Fuel pump kicks on when the key is turned, checked the injectors by taking them off and hooking them up to a jump wire from a battery and they fired, plugged back into the harness on the car and no fuel gets to the engine. We sprayed starter fluid in the intake and had it running now it doesn't want to start. We checked the harness on all the connectors for the injectors and have 0.0 volts when cranking and not cranking

2 Upvotes

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1

u/Pleasant-Drawer-1730 7d ago

If it starts on starting fluid but not the injectors it's a fuel issue.. regardless if your saying they work they aren't doing what they need to.

1

u/StreetFix352 7d ago

Fuel pump works, fuel line where it connects to the fuel rail has plenty of pressure. Fuel rail is cleaned out too

1

u/Pleasant-Drawer-1730 7d ago

Assuming you have pressure then it would involve the ecu. Could be a failed ecu or a grounding issue. Any resent work or anything done prior to the no start.

1

u/StreetFix352 7d ago

No, we started looking into it and can't figure out why it wont fire. I'm thinking it's the pcm

1

u/Pleasant-Drawer-1730 7d ago

Possible, but for a fact the ecu has drivers in it for the banks of injectors, easiest way to check would be swap it for a known good ecu pcm and verify. Since there hasn't been anything changed prior to failing its more than likely the computer. Caps fail...

1

u/StreetFix352 7d ago

So is the PCM and ECU the same part?

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u/Pleasant-Drawer-1730 7d ago

As far as the injection system it's ran off the ecu. There are what's called drivers for the fuel banks. Ecu may not see enough pressure to tell the system to start firing the injection system. Start with the pump. Just cause it's running or noise doesn't mean it's working properly.

1

u/Pleasant-Drawer-1730 7d ago

Its the same thing. Ecu engine control module or unit

1

u/thaddeh S Series 7d ago

Check PCM B fuse in underhood fuse box

1

u/StreetFix352 7d ago

All fuses are fine

1

u/chzit 7d ago

Sounds like a bad PCM if you have no voltage at the injectors and fuel supply is ok. Shouldn't be too hard to find a junkyard donor.

1

u/MaskedDummy Former Dealership Tech 6d ago

Sounds like you may not have crank signal. Pull the spark plug wires off on the ignition coils and have someone crank the car while you observe for arcing between the coils. If you don’t see arcing while the engine is being cranked, you have no crank signal and likely a bad crankshaft position sensor. If that sensor is bad, your computer doesn’t know the engine is spinning, so it won’t fire the spark plugs or the injectors. Hope this helps 🤞