'07 Valve Knock

[idlap]

My '07 (3200 miles now) developed a tapping sound at 2900 miles. It is not like the familiar rythmic clacking that diesels make but sharper and higher-pitched. It sounds like a loose valve does on a gasoline motor. I'm having the dealer look at it next week. They say it sounds normal but they're going to check the valve clearances. I would be grateful for any suggestions on what else to look for.



This is my first time, so be gentle.

 

[jwilliams3]

Welcome aboard mate.



Checking the valves is a good idea.

You can also zap the manifold with a temperature gun and see if there any MAJOR temperature differences which might lead you to something like an injector...

 

[CBrahs]

mine is doing the same thing. it is quiet when cold and gets worse when it warms up. the dealer told me it was normal and to drive it.

 

[Tryingit]

Even though I have a 04,5 I had a simular sound after my first tank of fuel. I read that you should use some power service (Walmart). Since my second tank (Currently 48K) I've been using 16oz of power service, grey bottle and 4 oz of Marvel Mystery Oil. The sound went away short afterwards and alls been well since. I also just adjusted the valves. I didn't notice a power increase but the engine is much quieter. I would wait until the engine is broken in and has some mileage before adjusting the valves. Good luck

 

[idlap]

Dealer Adjusted 2 Valves

I took it to the dealer and they adjusted the valve lash on #2 and #5. It runs smoother now and is quieter at all operating temps, plus a low-end vibration at highway speed disappeared. Best of all the tailpipe sound is smooooth!



The tapping sound is still there and is more noticeable: due to a quieter engine perhaps? I still need to check the manifold temps.



Thanks to all for your advice.