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Mach 1
Mach 1 - strange engine rattle
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<blockquote data-quote="P49Y-CY" data-source="post: 17023885" data-attributes="member: 10216"><p>i'll throw this out there since something similar happened to me and it was one of the last things i was expecting. do u still have the stock midpipe?</p><p></p><p>last year i put heads on my f150 4.6 and all was good for a couple of months until i started hearing a noise with very similar conditions. could have sworn it was a rod knock but went away under wot.</p><p></p><p>turned out that the substrate material in one of the catalytic converters was starting to come loose.</p><p></p><p>best of luck with it.</p></blockquote><p></p>
[QUOTE="P49Y-CY, post: 17023885, member: 10216"] i'll throw this out there since something similar happened to me and it was one of the last things i was expecting. do u still have the stock midpipe? last year i put heads on my f150 4.6 and all was good for a couple of months until i started hearing a noise with very similar conditions. could have sworn it was a rod knock but went away under wot. turned out that the substrate material in one of the catalytic converters was starting to come loose. best of luck with it. [/QUOTE]
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Mach 1 - strange engine rattle
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