zackn8

I recently began to hear a mechanical noise only when accelerating. The mechanic listened and said it was probably my exhaust manifold and that I could replace it any time I wanted.

I've taken a picture and included it here. Would a crack like this cause any noise upon acceleration? Also, is it truely something that is not an immediate concern?

HondaPartsHero

yeah it'll cause noise and can throw off your oxygen sensor reading causing some irregular gas mileage.

zackn8

I just took the mileage yesterday - 189.7mi/4.559gallons = 41.6 mi/g approx. (all freeway)

Since it only makes this noise upon acceleration - wouldn't this rule out the exhaust manifold? I'd assume that if it was the manifold crack, it'd be a constand noise. It sounds like ball bearings rattling around (like a mini semi-truck) when I hit the gas.

Spacefey

Think you would loose performance due to the hot air warming up your motor compartment. But with the heat-shield it shouldn't be noticable with your butt-meter

Deetz

That is a very common problem with that particular manifold design. If you are willing, go to your local pick n pull and find a decent used one, which should be pretty cheap.

New at the dealer, it's a pricey part