So the other day my full bolt-on, 00 WS6 M6 started making a tapping noise. Sounds like a screwdriver tapping the valve cover. I checked every available surbace with a stethescope, above and below but nothing obvious. The noise is loudest around 2k on the accel, with or without a load. non-existent at idle. Oil pressure is normal when cold or warm. I use mobil 1, 5w/30. It has 182k, but it is well maintained and those are mostly highway miles, I personally put the last 60k on the car myself. I hope its a lifter and not a damn rod knock. Any ideas??

I made the video on my iPhone, and it sounded great... on the iPhone.

 

Anybody?

 

Exhaust leak.

What exhaust are you running? LTs, Y pipe, cats, shorties, no cats, factory..... whatch got? Sounds like the goods inside the cat have came loose or a muffler packing has came loose.

Chad

 

I have ceramic longtubes, no cats, slp lm1 catback

 

And pacesetter y pipe

 

The LTs are pacesetter too.

 

I thought this forum was internal engine..... where are all the smart guys at?

 

There were only a few times I could hear the noise. That clattery ticking sound is a lifter sound if I'm hearing it correctly. Or dunno how hot the motor is could just be normal ls1 piston slap also. need better quality audio.

 

How about an under hood vid?

 

good idea. I'll get a better audio clip, and underhood clip