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93 F-250 460

2K views 4 replies 3 participants last post by  Jeremy20081 
#1 ·
When i get to 40 mph the rpm stop climbing an i start to hear a loud hissing noise what would cause this an were would i began to fix it?
 
#2 ·
Does this happen in overdrive, direct drive (1:1, generally third gear), or both?

It could be something as simple as a vacuum leak. Worst case would be a transmission problem. Is the engine light on? If so, be sure to have it scanned for the codes and post'm here.

Any more info on the 'hiss' sound would be beneficial for myself, and others to help diagnose.
 
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