Dead Injectors?

[Zachary Lawson]

That's interesting because 4, 5, and 6 are all driven from the same transistor inside the ECU. It would be very unlikely for all three of those injectors to spontaneously fail at the same time. If 4, 5, and 6 have all stopped working, it would be much more likely that there's an ECU problem.

And if injectors do hard fail, it's almost always that they burned open. You can check for that by pulling the connector off the injector and measuring the resistance of the coil inside the injector.

I would check into the ECU. My Z recently was doing something close to what your describing. I bought a used ECU for $50 dollars from eBay and it cured it.

[Zed Head]

was really just running rough it sounded as though it was missing. It would pop at every rpm and every gear and shakes horribly.

"Popping" usually comes from a lean mix. Maybe your fuel pump is failing or your regulator has gone bad. Or your AFM plug fell off. Have you checked fuel pressure.

A lot of money can be saved with the right measurements, and confirming what you think. Have you restarted the engine since the problem occurred to be sure that the tach is not jumping around? Have you tried removing the #2 and # injectors while the engine is running to confirm that they work? There's a lot of noise up there to be sure that you can hear them. You said that you can hear the AFM working. That is incredible, as in I can't really believe it. You may have heard air passing through it but the vane would only make a noise when the throttle blade is shut quickly, otherwise there is no noise to hear.

The methodical and thorough approach is the best method on the EFI engines.

Edited February 6, 2013 by Zed Head

[rcb280z]

Hence why I asked earlier....has he checked fuel pressure. No response on that one yet.