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The vacuum cleaner sound is the exhaust back pressure valve. it helps the engine warm up
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Central, New York
2002 F350 CC,SB Dually XLT, 7.3 Auto, 4X4,102k mi
ZooDad, NAPA 6637,Walker BTM, DIY WVO system '08 mirrors, Much more do
Towing 2011 Flagstaff 8528 BHSS approx 9200 lbs
2001 F-250 7.3L PSD Auto 4X4 SOLD
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