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Originally Posted by redneck_1086
we just bought a '99 powerstroke yesterday (ran and sounded good). well today it still runs good but if you get it to about 1.5-2 on the tach. it makes a realy loud blowing noise and dad thinks it's bad, so my question is it bad.
once you let off the acc. and the tach gets under 1.5 it sounds like it had sucked something up and it down't do it. (It sounds like a jet taking off) I NEED HELP PLEASE
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the first thing to check is for an exhaust leak where the Y pipes meet. climb under the truck. both exhaust manifolds have a pipe that goes up off of them, they meet at the turbo at a connecting manifold. look over both sides of the trans to see them. the one on the drivers side is easy to see. the one of the passanger side is kind of tought to see due to the exhaust downpipe. if you see black residue on the pipes where they go into the larger piece....then i would suspect your noise is an exhaust leak. also, check and make sure your air filter is sealing properly and if its stock...that any of the three "tabs" on the fender side of the box are not broken...although ive never heard of that making a noise, a bad enough seal possibly could..
If you dont find an exhaust leak, let us know and we can help you see what else to check........Marc