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SVT Shelby GT500
Header Noise - Opinions needed!!
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<blockquote data-quote="Darren5.0L" data-source="post: 11140556" data-attributes="member: 31098"><p>The theory is that the EGR valve was fluttering as it got hit with an exhaust pulse and then dropped until the next one popped it back open. On a log style manifold you have 4 pulses that feed the EGR. His was loud enough that we were worried the valvetrain was having issues, but it would never do it at idle, free revving, or WOT, even with a stethoscope.</p><p></p><p>It only occurred under load, 5 to 0 inches of vacuum from about 2,500 to 3,500 rpm, being an automatic car it was very common to have it dwell in that rpm range during highway merging, or climbing a gentle hill. It would simply rattle like hell.</p><p></p><p>We tried a lot of leak checking etc, and finally deleted the EGR and the problem vanished. I can't say 100% that it would be your issue, but it's something that is cheap to test out, and if it works you'll get to keep from pulling your hair out any longer.</p><p></p><p>When we took the EGR off and shook it we got a very similar sound to the "tack-tack-tack" noise we'd heard...</p></blockquote><p></p>
[QUOTE="Darren5.0L, post: 11140556, member: 31098"] The theory is that the EGR valve was fluttering as it got hit with an exhaust pulse and then dropped until the next one popped it back open. On a log style manifold you have 4 pulses that feed the EGR. His was loud enough that we were worried the valvetrain was having issues, but it would never do it at idle, free revving, or WOT, even with a stethoscope. It only occurred under load, 5 to 0 inches of vacuum from about 2,500 to 3,500 rpm, being an automatic car it was very common to have it dwell in that rpm range during highway merging, or climbing a gentle hill. It would simply rattle like hell. We tried a lot of leak checking etc, and finally deleted the EGR and the problem vanished. I can't say 100% that it would be your issue, but it's something that is cheap to test out, and if it works you'll get to keep from pulling your hair out any longer. When we took the EGR off and shook it we got a very similar sound to the "tack-tack-tack" noise we'd heard... [/QUOTE]
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Header Noise - Opinions needed!!
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