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post #1 of 4 Old 11-09-2009, 07:37 AM Thread Starter
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hey everyone i just have a quick question i have an 03 f350 6.0 and i straight piped it from the turbo back i noticed at idle or in park if i leave the truck running it makes two different sounds it sounds like the turbo starts spooling faster then it will stop and a lil later it will start over again truck drives great though and gets 23 mpg highway @ 70
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post #2 of 4 Old 11-09-2009, 08:10 AM
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EGR I believe, nothing to worry about.

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post #3 of 4 Old 11-09-2009, 08:31 AM
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The PCM cycles the turbo veins at idle to help prevent them from sticking.

2012 F-150 XLT Ecoboost SuperCrew 6.5' 4x4
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post #4 of 4 Old 11-09-2009, 08:37 AM
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Had same experience when I did CAT delete. Soon after EGR valve "failed" EGR delete kit and all problems gone.
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