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Car Forum / Honda Cars / February 2005High fuel consumption and cracked exhaust manifold?
Hi, I just went through my papers and found a recall from Honda that mentionned my Exhaust manifold could be cracked and would be garanteed under their extended warranty. How would I know if the manifold is cracked? Is there a loud noise? Does the consumption go up? I've noticed that my consumption has actually gone up but yesterday I had my timebelt changed and they didn't find anything? is it possible to overlook this? thanks, Jason Yes, a cracked exhaust manifold will result in excessive gas consumption. The easiest way to test if theres a crack is listening to the sound of the engine. First, start off by making sure that you engine is at full operating engine temperatures. Then pop open your hood and manually apply the throttle from the throttle body. If you hear any abnormal tone in your exhaust then you can be sure that there is a leak. I hope this helps you. http://www.trackspeedracing.com "Honda and Acura Drag Racing Parts Specialist" > Yes, a cracked exhaust manifold will result in excessive gas > consumption. Why? I beleive it's due to less back pressure. I have seen my fuel consution skyrocket from a open straight pipe. Dan > > Yes, a cracked exhaust manifold will result in excessive gas > > consumption. > > Why? > I beleive it's due to less back pressure. I have seen my fuel consution > skyrocket from a open straight pipe. [quoted text clipped - 5 lines] >> >> Why? On a o2 sensor equipped car, it will make a difference. Exhaust "pressure" is not constant, a good part of the time when not at high throttle settings, a negative pressure exists in the manifold . Air enters through the crack, and the oxygen in the added air is read by the o2 sensor, and it compensates by adding more fuel to try to correct the "excess" oxygen. I have not had direct experience with it but a friend had a Fiero, his stainless headers cracked constantly, and he said he could tell by monitoring his performance and gas mileage. Scott |
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