Now that the warm weather has arrived, I've noticed a faint "ticking"? Below are links for how it sounds when at Idle. I had a friend slowly rev the engine to see if it increased. Second link is how it sounds when running. Any idea what it could be? I recently did the seamfoam treatment, but not in the crankcase. Thinking about doing that soon and moving from 10W-40 to 15W-40. Summers here can be brutal. I just finished installing a new cooling system and the 180 thermostat over winter-spring. Nothing overheating, no drop in coolant, oil doesn't look contaminated. TIA.

https://drive.google.com/file/d/1QJU...ew?usp=sharing
https://drive.google.com/file/d/1m-t...ew?usp=sharing

 

In case the old videos were'nt quite good enough for sound, I've re-recorded the problem. Sound I'm looking to identify shows up under acceleration around 2,000 RPM. Starting to wonder if this is the fuel pump starting to go....I'm not the original owner so no telling if it has been replaced yet.

https://drive.google.com/file/d/1Y0f...ew?usp=sharing <-Shorter Video
https://drive.google.com/file/d/1TuF...ew?usp=sharing <- Longer Video

Any help is VERY appreciated. TIA.

 

After several days of driving with this noise to try and figure out where its coming from I think I've figured it out....realized that the ticking noise is very faint while in park. Popped the hood to see if I could see anything moving around. Today was a little overcast by the time I got home so the garage was darker than normal. Found the culprit- misfiring spark plug way in the back on the driver side.

Going to replace and see if the tick is gone. My guess is that the misfire was just amplified by road noise....I'll report back with an update. Suprising given that there were no CEL codes.

 

**Update**

Tick did not change with a new plug. But I did find the answer today. After more research, I sprayed some soapy water on the passenger side manifold while it was cold and checked it out before I left for work in the morning. Gasket between the Y-pipe and the manifold got REAL bubbly.