LeSabre does not start

94 Buick LeSabre

- New Spark Plugs and Wires
- New Crankshaft and Camshaft Sensors
- Replaced Ignition Module and Coils with used working ones
- Tried Computer from another LeSabre (same number) Switching PROM
- Fuel pressure OK
- Compression OK on all cylinders
- Don't see any vacuum leeks
- I see spark and Injectors spraying

But doesn't start! It turns but no signs of starting.

Any help would be appreciated.

Tony

The exhaust may be plugged. Could be either muffler or catylitic converter.

I wonder if the timing chain broke or slipped entirely. Or, maybe the a sprocket is shot. Might explain while it was stumbling to being with. Maybe there was a lot of play in the chain. The valves may not be opening and closing at all now, or it slipped a few teeth, so they are out of sequence. If you have someone else turn it over, can you look in the oil fill and see the valves lifters moving up and down? If the valves are moving, the chain would still be connected, but it still may have slipped causing the timing to be off.

The valves move, and if I spray starting fluid into the intake it tries to start.

I wonder if the timing chain broke or slipped entirely. Or, maybe the a sprocket is shot. Might explain while it was stumbling to being with. Maybe there was a lot of play in the chain. The valves may not be opening and closing at all now, or it slipped a few teeth, so they are out of sequence. If you have someone else turn it over, can you look in the oil fill and see the valves lifters moving up and down? If the valves are moving, the chain would still be connected, but it still may have slipped causing the timing to be off.

I just tested the injector's harness with the Noid Lights and none of them has a pulse. What could be causing that?

Sounds like it's electrical. Possibly, it is not getting power due to a bad connection or broken wire. I think you mentioned that the fuel pressure is good and the fuel filter is okay, etc. Is there possibly a fuse for the fuel injection system that might be blown? I would look for any broken or loose wires around the fuel injection system and check all of the grounds for the fuel injection system to make sure they are good. If that didn't yeild any results, I would probably pull out the fuel pressure regulator and make sure all looks okay, clean, etc. I would check the wiring harness where it connects to make sure all of the connections are clean and good. If that didn't work, I would get the system wiring diagrams to see if I could figure out exactly which wires carry the power and signal from the ECU. I would try to test for power with a test lamp. Also, I would test the grounds or add a test ground wire directly to the system. There may be a fuse for the fuel pump too. Fuel pressure sb 40 to 47 lbs.

It was the fuse for the fuel injection system.

Thank You