Hi Scotty, love your YouTube channel and the awesome contribution you are making to the DIY car repair community. I have a 2006 Honda Pilot with 3.5 liter V6 with 148k miles on it. I always changed…

Jacabooneb

Hi Scotty, love your YouTube channel and the awesome contribution you are making to the DIY car repair community.

I have a 2006 Honda Pilot with 3.5 liter V6 with 148k miles on it. I always changed oil and filter every 5K miles with specified 5w-20 Mobil 1 synthetic.

The engine has developed a fairly loud knocking sound when cold. I adjusted the valve lash and replaced the timing belt tensioner which was making some of the noise but the knock persisted.

I seem to have isolated the problem to the #5 cylinder (front center) as the knock goes away when I remove the spark plug coil.

I am thinking I may have a #5 cylinder/piston slap although there are times when I first start the engine and there’s no noise at all, then it appears again after running for 30 seconds or so.

Please comment/ advise.

Thank you and keep up the great work!

Comments (7)
No. 1-2
Jacabooneb
Jacabooneb

Thank you dil 89. I replaced the plugs fairly recently and as I recall, the knock sound was there before the replacement. But plugs are relatively cheap and I will try replacing the plug or just swapping it out with another cylinder and see if the knock moves with it.

dil 89
dil 89

That's not piston slap it sounds like spark knock probably have a bad cylinder