Possible Vacuum leak
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Posting Guru
Joined: Oct 2005
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From: CA
Possible Vacuum leak
Symptom: When I turn on the Ignition, there is a pump noise that constantly runs (passenger side, behind the battery). Someone told me that there is a vacuum leak. Is there a diagram showing the components of the vacuum pump? I want to start by replacing all hoses.
Any troubleshooting tips is much appreciated.
Other Side effects: Hard to start, no 4x4(I have not checked it recently).
Any troubleshooting tips is much appreciated.
Other Side effects: Hard to start, no 4x4(I have not checked it recently).
Thread Starter
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Posting Guru
Joined: Oct 2005
Posts: 2,220
Likes: 2
From: CA
Thanks Tugly, I actually found a similar diagram on line as well. But pardon my ignorance, I was not able locate the motor running behind the battery on the passenger side in the diagram.
Cross-Country
Joined: Jun 2013
Posts: 60
Likes: 3
4 wheel drive not working
i would like some idea where to start tracing a leak for my 4 wheel drive system. when i turn my switch inside to 4 wheel D the air goes to full defrost mode. what does this mean and where do i start.. thansk
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I used a Mity-Vac with a vacuum gauge (crucial tool on the 7.3L). Isolate one of the vacuum lines, hook it up to the Mity-Vac, and test its ability to hold a vacuum. Repeat as necessary. The leaks are usually the lines near the wheel, but I've had that PVH Solenoid on the passenger-side fender go bad as well.
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