2G Injectors making buzzing sound. Cant figure out whats causing it.

[OrlandoDSM]

My 1997 eclipse has been making this weird buzzing sound for the longest and I can't figure out what's causing it.

I replaced, plugs,wires, and coils. I replaced fuel filter aswell. I believe the injectors are pte injectors 1000cc from what I was told from the previous owner.

Here's a video of the sound

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[motomattx]

That sounds to me more like the pcv valve is rattling.

 

[CKOPOCT]

Agree with Motomattx. Doesn't sound like an electrical buzz so much as a mechanical rattle... especially since it changes frequency and presence under idle and seems to disappear under accel/decel. Recommend checking easy to see/reach things first (pcv, v/c bolts, etc.). If that doesn't lead to an answer, go the stethescope route - use a mechanic's stethescope (or home made one) to listen to different points on the block and components to find the rattle.

A mechanic's stethescope is basically 2 ear pieces like a doctor has but is attached to a thin metal rod instead of a diaphragm. You touch the rod to different points on the engine and the rod transmits vibrations to the ear pieces so you can determine the source of bearing whines, loose bolts, valve noise, etc. If you don't have one and don't want to buy one, you can use any long thin piece of metal to achieve the same result. A long thin screwdriver works well. Just put the butt end of the handle against the back of your ear by your lower jaw. You'll "hear" the vibrations tympanically. I've been diagnosing bad ps pumps, water pumps, and lifters/lash adjusters for years this way.

 

[waltah]

A mechanic's stethoscope is basically 2 ear pieces like a doctor has but is attached to a thin metal rod instead of a diaphragm. You touch the rod to different points on the engine and the rod transmits vibrations to the ear pieces so you can determine the source of bearing whines, loose bolts, valve noise, etc. If you don't have one and don't want to buy one, you can use any long thin piece of metal to achieve the same result. A long thin screwdriver works well. Just put the butt end of the handle against the back of your ear by your lower jaw. You'll "hear" the vibrations tympanically. I've been diagnosing bad ps pumps, water pumps, and lifters/lash adjusters for years this way.

A lot of us grew up with that tool and the 'field expedient' screwdriver or wooden dowel but I was amazed a year or two back when I needed to buy one at what's out there now. First, they're mostly electronic -- the rod hooks to a microphone, there's an amplifier with a volume control and you can use headphones -- more comfortable, you can hear better, and safer. But you can also get clip on microphones with leads long enough that you can drive the car ... hook it on to a suspect part and pin down a noise that happens only on the road. I found a failing wheel bearing that way before it was bad enough to hear inside the car while looking for something else

Or you can go big time, with wireless microphones and a channel switch on your receiver. Even at the high end you're only talking $150 or so, as I recall.

Pretty useful stuff, modern technology.

 

[waltah]

That sounds to me more like the pcv valve is rattling.

It does. And if it's the PCV valve you can probably feel the rattle. Might have to unscrew it until there's a little bit of play in the threads so it isn't damped by the mounting.

But the mechanic's stethoscope is the 'book' way to check something like this.