What can cause the fuel injectors to not receive a pulse when cranking the engine? I have good spark, and fuel pressure, but the fuel injectors are not firing.

 

 

This problem is occurring in a 2001 Legacy EJ25 engine (EJ252AWAWL). The original engine had serious internal damage due to the previous owner driving low on oil (damaged crankshaft, one spun connecting rod bearing, and damaged rings and pistons. I found a replacement EJ25 from a 2003 (EJ251AXEWL). I am using the long block from the replacement with the original intake manifold and all electronics from the original.

 

This is what I have checked so far:

 

Fuel pressure – I don’t have a fuel pressure gauge, but after cranking the engine, and disconnecting the line between the filter and rail, I have pressure. There is also return flow to the tank.

 

Camshaft and crankshaft position sensors. The resistance for these looks good (1.9K and 1.88K)

 

Ignition coil and ignitor assembly primary and secondary resistance ok.

 

Checked and cleaned all ground point connections.

 

I don't think the problem is related to timing. If i open the throttle and inject a small puff on quick start, the engine will fire and run breifly.

 

Any suggestions would be appreciated.

 

Thanks

Have you checked and verified that you have 12v on one pin of the injector connector? That should have 12v all the time, or at least the older legacies did. Use a volt meter and check for voltage on each of the connector pins going to the injector.