Hello everyone, does anyone have, or know where I can find, the vacuum hose diagram for the 2001 F150 4.2L V6? I've looked everywhere, but can't seem to find one more my truck. I want to make sure I check ALL the vacuum hoses on my truck, because I'm getting a P0171 that I simply can't find. - I suspect its thrown because of a possible valve train issue I'm experiencing, but I want to rule out the vacuum leak issue before I open the upper end of the engine.

Thank you,
Calixto

 

 

Thank you ManualF150, I appreciate this...I would have thought there were more vacuum lines. Seems like very few. -- OK, at least its a good start. - Thank you!

 

Nope. It's pretty simple.

But simple is only what you can "see". Tracing some of these lines is a complete pain in the you know what...

Best way to find leaks is using an UNLIT (yes -- UNLIT) propane torch and tracing the lines out with it. Any cracks/openings will suck in the propane and the engine will try to burn it causing a very noticeable change in engine RPM and sound.

 

Thank you ManualF150...I do agree that tracing this down is going to be a royal pain.

 

Need to know where exactly the 3 lines on passenger side back of intake go, also what lines hook up to the small lines on the metal coolant tube coming out of the water pump