Ticking noise when car gets warm L67

[jake91]

Mt gtp with 63k miles on it has developed a ticking noise. It started out of nowhere after a long drive one night. it only shows itself after about a 20 mile freeway drive, or if you run the car out past 5k rpm as i found out tonight getting on the freeway shortly after starting the car. The tick is most prevalent between 3k-4500 rpm and more so if you just keep reving the car.

i have had it to a shop where they checked it over with a mechanics stethoscope and the guy told me that he didnt hear anything internal, and that all he could hear was a pully grinding. he said he was sure it was a valve or lifter when he first heard it but the stethoscope said otherwise, and i should look for exhaust leaks.

so then i went to a exhaust shop they said they didnt see anything out of the ordinary and since they waited to long and let the car cool a bit they couldnt hear it

so then i had a friend look it over. after hearing it he said he doubted a exhaust leak as it was too metallic sounding but to him it didnt appear to come from within the engine either and that i should check the accessories

I have noticed no drive ability issues. Car runs absolutely great. it does seem that i have lost a bit of gas mileage, but that probably just the winter blend gasoline, and having to drive in rush hour more, and i have noticed a slight vibration at lights (minimal though)

its very hard to hear it in the video and the engine noise and injectors can kind of cancel the tick out

video one- hood closed continually revving cat
L67 ticking noise video - YouTube

video 2- under hood going through the rpm band
Better ticking Video l67 - YouTube




Thoughts

 

[Fivefingerdeathpunch]

Almost sounds exhaust leak to me.

I hear no internal sounds.


I mean you could try doing a oil change and see if it goes away.

 

[jake91]

Recent oils change in last 2000 mile

See I keep thinking its exhaust, but I keep being told its not. there is a small
Ring of soot where the dp meets the manifold and too me the sound seems to come from the firewall area

 

[Bessesen2]

Exhaust manifold leak.

 

[jake91]

Bump still can't pinpoint this noise. Replaced all bad pullies, checked multiple times for exhaust leaks isn't getting worse or better. It's hardly noticeable with load on the engine but when you rev it up you can hear it. It seems to be a bit more consistent now it starts at 2k rpm and seems to speed up with the motor. Now that all the othe noises are taking care of and after changing the oil it seems to be coming from the front valve cover. Thinking it may be a sticky lifter but the whole having to drive the car at highway speeds for nearly 30miles to get it to start makeing noise still seems weird

 

[Bessesen2]

Manifold leak most likely, new gaskets should solve