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Tim West
Tim West, ASE Certified Technician
Category: Ford
Satisfied Customers: 4638
Experience:  ASE Certified Service manager of Firestone
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Why does the F 150 whistle at highway speed in the cold?

Resolved Question:

Why does the F 150 whistle at highway speed in the cold?
Submitted: 7 years ago via
Category: Ford
Expert:  Tim West replied 7 years ago.
Thanks for visiting
A bad cat converter can cause a whistle like this.
Check the exhaust backpressure first looking for no more than 1 PSI at 3000 RPM in neutral. If the backpressure is high, address as needed and recheck operation.

2. If the exhaust backpressure is OK, monitor the VCTADVERR (Variable Camshaft Timing Advance Error) for bank 1 and bank 2 while driving. The reading should stay around 0* at all times. If the reading is going abnormally high on either bank, address the variable camshaft timing problem and recheck operation.
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