My ongoing fuel injection woes (Now with compelling HD Video)

[KDMatt]

FastWoman,

I forgot to mention I did use heatshrink actually. They came with the kit that the guy on ebay sells. No worries there.

Also, I've performed the electrical tests outlined in the FSM and EFI bible, and everything has come back fine.

I also forgot to mention that, last night, when I cranked up the car, I did the screwdriver-to-ear-to-injector thing (where I put the screwdriver on the injector, and put my ear to the butt of the screwdriver), and listened for the injector sound. All of them sound like they're pulsing correctly and consistently.

[FastWoman]

To make certain all your cylinders are pulling their weight, you can unplug injectors one-by-one. When you unplug an injector to a working cylinder, the RPM should drop. If the cylinder's not working, the RPM won't be affected. This could rule out issues like clogged injectors and faulty ignition wires/plugs.

[KDMatt]

Hey, Fastwoman. I pulled each injector clip off, one by one, and noticed a drop in RPM each time I did it. Sounds like each cylinder is 'pulling its weight' as you say.

Interestingly enough, I did your yogurt cup test and did notice I had a bit of a leak near my cold start injector. Looks like I'd managed to forget a screw (:stupid:), and the gasket, as a result, over time didn't seal properly. Not sure how much air was actually getting in (my vacuum reading hasn't changed after fixing it), but I've sealed up the leak, and the idle does seem to have stabilized a little bit.

I'm not sure if this has completely fixed my issue, but the car might at least be somewhat driveable now. I took it for a brisk spin last night for about 15 minutes and it didn't seem to cough quite as much at low revs.

I'm out of town for a couple of days (won't be taking the Z with me, obviously), but I'll probably do some more cruising around next week to see what's what.

Thanks for all the help so far!

[cygnusx1]

I can hear the vacuum leak. Look for it.

Pull off the oil cap slowly. Does the idle change significantly worse? If not, you have a significant vacuum leak.

Edited June 26, 2011 by cygnusx1

[FastWoman]

One more little gremlin dead!

Now that you know each of your cylinders is pulling its weight with a dry engine compartment, maybe see what happens after you've hosed everything down. I'm guessing you might have some badly sealed ignition parts that might need a touch of dielectric grease.