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Auto Go
Auto Go, ASE Certified Technician
Category: Ford
Satisfied Customers: 849
Experience:  ASE Master certified, ASE certified Undercar Specialist, ASE Advanced Engine Performance certified
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1999 F150: diagram..4.2L..the one under the hood is no longer

Resolved Question:

looking for a vaccumn lines diagram for a 1999 F150 4.2L the one under the hood is no longer there
Submitted: 7 years ago.
Category: Ford
Expert:  Auto Go replied 7 years ago.
Hello and welcome to Just Answer!

Here is the vacuum diagram you requested.


Customer: replied 7 years ago.
is there a diagram that shows exact locations on the4.2L motor. Also do you fill like that the trouble codes are indicating another vaccumn leak in the lines are what is your suggestion
Expert:  Auto Go replied 7 years ago.
I do not have a "picture" with that sort of detail.

Some common leak points are the PCV hose being collapsed. Follow the hose from the PCV valve all the way back to the engine. Make sure it's not sucked flat and split anywhere. THis is very common on almost all ford engines.

Another potential leak point is the intake manifold gaskets and what's called the isolator bolts. The Isolator bolts attach the upper intake manifold to the lower intake manifold and have seals on them that can go bad. You can attempt to determine if the intake gasket is the cause by spraying carburetor cleaner around the intake and listening for the engine to respond.

Further diagnosis will require the use of a full function scan tool with data stream capabilities.

thanks and I hope this helps.
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