Weird sound just started...

[ultrashock2112]

I did a search and found some similar articles but no solution/explanation of this weird noise I'm getting all of a sudden... Every once in a while, I hear this really odd sound coming from my engine, the only way I could explain it is like a low droning or humming sound. It sounds fairly loud inside the car, I'm not sure about outside the car. The first time it happened I had started my stang cold and let it idle for a few seconds parked, all of a sudden the sound started and slowly got louder. When I pressed the gas it went away. Today, when I was driving it started to do it, and again, I pressed the gas a little more and it stopped.

The only thing I've done to my car recently was I flushed my cooling system and added one of those "stop leak" products because I had a leak in my radiator. I've since replaced my radiator and put in new coolant but I didn't do a full flush...

Any ideas??

 

[nwapache]

A humming sound? you'd need to post a good sound clip...or better yet, take it to a shop....its too generic to guess

 

[DocG]

You sure everything with your radiator swap is tight, all clamps on hoses, bolts...etc. Could be something as simple as something loose vibrating, and since you just worked on that and said it was coming from your engine. Increased rpm's may cause it to vibrate at a higher frequency, thus changing the sound you hear.

But yeah, that's a little broad to diagnose over the internet. Get someone to help you iwth the car in park, and listen for the noise.

 

[ultrashock2112]

The problem started after I did the flush and added the leak-stop chemical - before I swapped the radiator. The problem is that it happens so sporadically, the only thing that seems to be consistent is that it seems to happen shortly after the car is started from cold.

The sound is so weird, it's not a sound I could ever imagine a car making. It's like the sound you hear when you blow over the top of a large bottle, but louder and deeper. I agree though that it is probably something to do with the cooling system, I wonder if I should do another full flush and refill to make sure that chemical is washed out?

 

[triggz]

I had a strange noise like that in my car once.. after quick low-speed WOT bursts and letting off, it did a weird hum. Like someone plucking the deepest note on an electric guitar, but sounding more like the engine than a guitar of course..

Never figured out what it was, it eventually went away. Theres lots of possibilites for strange harmonic frequencies in the car..