Hi guys, I have a set of used 50k mile LT1 24 lb/hr Multec II injectors in the Stealth Ram on my 327. The car runs great. At idle with the hood open, I just noticed the other day that the injector on the #1 cylinder will sometimes make a noticeable buzz at idle. I know that it is normal to hear these injectors clicking, quite loudly sometimes. However, this one injector makes a noticeable buzz that it will do for a second, then stop, then do it again a while later. The car idles well and doesn't have any noticeable running problems, but the car has been sitting A LOT lately, so I'm wondering if this old injector finally is wearing out a seal or something. The injectors are from a 1994 LT1, so they have been around for a while! I never had noticed the buzzing before, but the car used to get driven a lot more often. I measured the impedance of the injectors a few months ago (I'll check again), and I think they were all around 12 ohms? I don't remember the exact # but they were all giving me nearly identical readings. The car had been sitting for many months without running before I started driving it again recently. Sound like its time to rebuild the injectors? Is there a kit I can get to rebuild the Multec IIs? I know there are places that will rebuild and flow match, can you recommend someone?

 

Buzz? Strange. Does it buzz in synch with injections, or does it buzzzzzzzzzzzzzzzzzzzzz for an extended time? Sure it's only the #1, and not the whole bank or all injectors (keep in mind - two 12V power wires, but only 1 injector driver at ECU)? Do you have a stethoscope, or feel like sticking some fuel line or vacuum line in your ear?
I'd first disconnect and reconnect a few times to make sure it's not just a flaky connection. Other than that, I'ma little stumped. Try to swap connectors (all the injectors fire at the same time, so probably not it). Since it's a stealth ram, should be easy to swap injectors if you can find one, or move them around see if it's not something about that location.

Any stumble or pickup associated with the buzz?

 

It does not seem to change engine speed or running quality at all with the buzzing. It seems to be buzzing on/off a lot more slowly than the speed at which the injectors are firing. I'm going to pull the plugs and see what they look like, and switch the wiring and injectors around and see what happens.