2G Car starts, but 2 injectors not firing...

[99GST83]

I just recently replaced my crankshaft position sensor, camshaft position sensor, IAC valve, checked resistance on all spark plug wires, 4 new plugs, and all 4 cylinders are getting spark (while engine is running, I can pull the boot off of the plugs and hear the "popping" of the spark on all 4 plugs.)

The engine starts up, but only runs on 2 cylinders. (sounds like a WRX right now) When I pull my injector plugs on cylinder 1 and 2, there is no difference. When I pull either 3 or 4, it chokes and tries to die. Timing is 100% on. All marks line up perfectly. Compression test confirmed that all 4 cylinders have great compression.

Any ideas?

 

[muddfisher85]

Sounds like the ecu to me. Do you have a spare one or a buddy that will let you use his to see if it will start? I had the same issue until I swapped ecus to check. Mine looked fine but it was the issue. Hope that helps a little.

 

[99GST83]

I do not have a spare available. Nor do I know anyone else around my area with a 2g Eclipse

Just tested all injectors and injector harnesses. All check out good with mutlimeter.

 

[99GST83]

Anyone else have any symptoms like this, and if so, what did you do to finally fix it?

 

[luv2rallye]

The CAS (cam angle sensor) controls the injectors timing through the ECU. Remove CAS (and mark it's position). Then turn key on and rotate CAS - injectors should fire 1 at a time.

 

[99GST83]

I dont have a camshaft angle sensor, i have a camshaft position sensor.

 

[luv2rallye]

Your camshaft position sensor is refered to as a CAS on this site. CAS vs CPS name confuson is discussed here: http://www.dsmtuners.com/forums/newbie-forum/272874-oh-god-code-0340-a.html#post151302110.

 

[TheTrap]

Did you ever solve this issue? I have a 97 gst that is doing the same thing but it's injectors 1&2 that are working and 3&4 that aren't.