CYL #3 injector not firing

[T-rev]

So the old SR is running like a geo lately. Only 3 cylinders firing. The injector not firing seems to be the cause, since unplugging it while the car is running doesnt change the crappy idle.

I changed out the injector for a spare, no go. Swapped the injector for one from a running cylinder, still no go. Swapped ecu's, no go. They only code it threw was #54, "automatic transmission sensor" which makes sense because the spare was a 63.

So I figure I got a monkey in my harness. The injector plug has +12V, but its hot all the time (even w/ key off) is that weird?

The injector firing signal from the ecu would be a ground? So Im looking for a ground signal at the ecu on the injector wires in the harness?

[White Comet]

check ur coil packs and see if ur getting spark. if u need i have 3 sr coil packs laying around.

lets say a coil pack is out and u have no spark. pulling the injector for that cylinder wont change it cuz it wasnt firing in the first place. if that is the case it had no spark, all u did was give it no fuel. therefore replacing the injector, and changing the ecu had no result.

[T-rev]

good call. Ill pull the plug to see if its wet. Then swap coil packs and see what happens. Thanks!

edit: thats the ticket, dead coil
Modified by T-rev at 8:47 AM 8/22/2007

[White Comet]

got ur email and replied