Hi all.
6 month ago we bought a 3 year old Toyota with a 1.6 valvematic engine. The engine runs great and is a really nice engine. But one thing bothered me..a lot. The engine had a faint but really noticeable knocking sound from the cylinderhead/valvetrain. It goes away above 1000 rpm's.
So.. I went to the dealer. They send out a mechanic he listened. And apparently it is perfectly normal. All Toyota valvematic engines do it. And the reason. A cam driven vacuum pump. He explained that due to the function of the valvematic system. The engine had no traditional throttlebody. And therefore no vacuum in the intake to support the brake system. Therefore they mounted a vacuum pump. Just like if it was a diesel. Or turbo engine.
It really does give the engine a bit rough idle sound. And not something I like to listen to.
But how normal is this to newer engine design. Any other engine makers who makes there engines like this? Or is it just Toyota?
6 month ago we bought a 3 year old Toyota with a 1.6 valvematic engine. The engine runs great and is a really nice engine. But one thing bothered me..a lot. The engine had a faint but really noticeable knocking sound from the cylinderhead/valvetrain. It goes away above 1000 rpm's.
So.. I went to the dealer. They send out a mechanic he listened. And apparently it is perfectly normal. All Toyota valvematic engines do it. And the reason. A cam driven vacuum pump. He explained that due to the function of the valvematic system. The engine had no traditional throttlebody. And therefore no vacuum in the intake to support the brake system. Therefore they mounted a vacuum pump. Just like if it was a diesel. Or turbo engine.
It really does give the engine a bit rough idle sound. And not something I like to listen to.
But how normal is this to newer engine design. Any other engine makers who makes there engines like this? Or is it just Toyota?