Hi
My 2005 TL, 150,000 miles, has slowly developed a noticeable ticking noise. It is borderline a knock. It seems to start about 30 seconds after start-up, and then comes and goes randomly. It appears to be coming from the rear cylinders, 1 or 2.
It is not the famous timing belt tensioner, which I have changed, and checked again. (lots of FUN!!)
Valve clearances are all good.
No codes are on the DTC.
Oil changes are done consistently. Performance has not been affected as of yet.
It seems that part of the valve body/rockers are not being lubricated properly and something is sticking or loose.
Help please

 

I know the pain. I have 05 AT. Mine has same exact problem. Cant find issue, done all required maintenance. I only have 130k, the noise started around 115k. Really really really really cant stand it.

 

How loud of a tick? Do you own a mechanic's stethoscope? I've seen some really noisy fuel injectors on Honda/Acuras but otherwise functioning normally.

 

I got a similar noise after turning on the heat after a whole 8 months without using it and got a small noise from the heater valve on the rear bank of cylinders.

 

UPDA

So after another attempt at checking the rear valve bank, and clearances, I put it back together and slowly, and the noise has went away.
All I did is wiggle the rocker arms and springs around a bit, and it seems to have gone away. I wont celebrate until I get a thousand miles of quiet running, but for now, I am happy.

will post regular updates on this one.

 

Can you let me know what you did to get to the rear valve bank if you dont mind? I want to get it looked at. I been trying to solve this for about 2 yrs. I would appreciate it. Thanks.