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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have a 2004 Ford F-150 4x4. I am losing vacuum when I

Customer Question

I have a 2004 Ford F-150 4x4. I am losing vacuum when I press the gas pedal in drive not in park. In park the vacuum stays at 22 and when depress the gas pedal it increases then releases back to 22. The loss of vacuum (to 5) in drive is causing the 4wd to engage. I have tested all lines, valves, air resovoir, new solenoid, new actuators. I am convinced it has nothing to do with the 4wd system as everything tests out. I'm wondering if there is vacuum to the transmission and do I have a leak in a line to the transmission
Submitted: 2 months ago.
Category: Ford
Expert:  EricFromCT replied 2 months ago.

Hi. Welcome to chat! My name is ***** ***** have been a dealer tech for 20 years. I will attempt to assist you with your concern today.

Expert:  EricFromCT replied 2 months ago.

Did you replace the check valve in the vacuum line near the solenoid?

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Customer: replied 2 months ago.
It is brand new and tests out for holding vacuum
Expert:  EricFromCT replied 2 months ago.

I am unable to perform a call at this time. I will open the chat up to an expert that can assist with a call. Thank you.

Customer: replied 2 months ago.
The 4wd system is tight. I only lose vacuum when put in drive and touch the gas pedal slightly. I put a T in between the manifold and first check valve with my gauge and kept perfect pressure in park. When put in drive and touch the gas it goes down
Expert:  Chris (aka- Moose) replied 2 months ago.

Welcome, I'm Chris (aka Moose). I'm here to help 365 days a year, but not every hour of the day. I try to prevent delays as much as possible. Please understand I am not there and can only advise based on what you tell me. Let's get started.

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