Hi guys,

First of all, engine is 100% stock down to the air filter. Only "mod" is the removal of the sound tube using the CoolTech delete kit.

Recently I've noticed a light metallic flutter noise around 3k rpm, best heard in 3rd gear on light acceleration, but also in 4th gear and sometimes when letting off the gas in-between shifts.

Not sure if it has something to do with the variable cam timing or what but I'm a little worried about it.

Anybody else heard of this type of noise on these 5.0's ?


Thanks in advance

 

You might need to change gas stations.

 

I noticed a difference in sound moving to 92 octane "racing fuel" (non-ethanol) as compared to 91 octane ethanol shell fuel... try this advice, if it doesn't pan out see your dealer...

 

Updating this thread since I just fixed this "engine" noise.

Last Sunday I met up with a buddy with a manual-trans '12 5.0 and he had the idea of driving his car to see if any of my noises are happening on his car.
We ended up driving each other's cars, and while I was sitting in the passenger seat of my car I was able to hear this noise again of course, but I was hearing it come from the left rear of the car.

It blew my mind, and I immediately started thinking that MAYBE it has something to do with the bolt that I couldn't quite get tight above the left muffler holding that bracket in place, I could only get it about half-way in when I installed the GT500's

Today I back the car up on ramps, get under there to tighten the bolt, and have a "WTF?" moment when I realize that the bolt is missing !!!

Apparently it backed itself out and the bracket was rattling against the frame rail back there.

Moved a bolt from the rear hanger and it fit, took that bolt to a local screw/bolt store, they matched it up perfectly, and 70 cents later my noise is gone !!!!!!!!!!!!

I felt so stupid, especially as to how I couldn't get it tight the first time, considering all you have to do is push the muffler backwards a bit and there's room to get a wrench in there (above the muffler) ...

Anyway, just came back from a test drive, and it was one of the most enjoyable drives I've had in this car in a long time, lol

 

Oh boy...

 

LMAO, yeah, major fail, but it's fixed now and it made driving the car SO much more enjoyable, since I seem to spend a lot of time around 3k RPM in 3rd/4th gears ...