Vacuum Leak: EVR, VMV
Thread Starter
|
Senior User
Joined: May 2004
Posts: 392
Likes: 0
From: Las Vegas, NV
Vacuum Leak: EVR, VMV
I have a vacumm leak and I think it is the Electronic Vacuum Regulator solenoid. Should this hold a vacuum? The one in my vehicle will not hold a vacuum when placing a vaccum on one port using a Mighty-Vac hand pump and plugging the other port. Testing in the reverse will not hold either.
Also, the Vapor Management Valve will not hold much of a vacuum. When pumping a vacuum on the manifold vacuum port, the vacuum will go up to about 1" after a lot of pumping, but ultimately will never go higher. Is this correct or do I have a problem there as well?
Also, the Vapor Management Valve will not hold much of a vacuum. When pumping a vacuum on the manifold vacuum port, the vacuum will go up to about 1" after a lot of pumping, but ultimately will never go higher. Is this correct or do I have a problem there as well?
Thread Starter
|
Senior User
Joined: May 2004
Posts: 392
Likes: 0
From: Las Vegas, NV
I'm needing some more advice on this problem.
To start, I am trying to locate a vacuum leak so my A/C will continue to blow out the front panel while under load. Currently it keeps going to the defrost. I also suffer from a low idle.
While trying to find the vacuum leak, I believe I narrowed the problem down to air leaking through the Electronic Vacuum Regulator (EVR). After ranger88a told me that voltage needed to be applied to stop the leak, I tested the EVR with the engine running, but it still leaked air into the vacuum lines. So I replaced the EVR and the new one does the same thing.
I checked the voltage across the EVR with the engine running. There is around 12 volt across the connector and using an AC meter I determined there is an AC component which make me think it is getting a pulse width modulation.
With the engine running, will the EVR normally allow air back into the vacuum source lines?
When I put a vacuum on the manifold connection for the EGR and A/C system, it will not hold a vacuum at all. When I plug the source line to the EVR, the vacuum will reach to about 2 in.mg. with a lot of pumping and will drop to zero over a few seconds. With the vacuum line to the EVR and the Vapor Management Valve plugged, it will go well over 20 in.mg. and hold forever.
If anyone has some insight for me, please let me know.
To start, I am trying to locate a vacuum leak so my A/C will continue to blow out the front panel while under load. Currently it keeps going to the defrost. I also suffer from a low idle.
While trying to find the vacuum leak, I believe I narrowed the problem down to air leaking through the Electronic Vacuum Regulator (EVR). After ranger88a told me that voltage needed to be applied to stop the leak, I tested the EVR with the engine running, but it still leaked air into the vacuum lines. So I replaced the EVR and the new one does the same thing.
I checked the voltage across the EVR with the engine running. There is around 12 volt across the connector and using an AC meter I determined there is an AC component which make me think it is getting a pulse width modulation.
With the engine running, will the EVR normally allow air back into the vacuum source lines?
When I put a vacuum on the manifold connection for the EGR and A/C system, it will not hold a vacuum at all. When I plug the source line to the EVR, the vacuum will reach to about 2 in.mg. with a lot of pumping and will drop to zero over a few seconds. With the vacuum line to the EVR and the Vapor Management Valve plugged, it will go well over 20 in.mg. and hold forever.
If anyone has some insight for me, please let me know.
Thread
Thread Starter
Forum
Replies
Last Post
danlee
Brakes, Steering, Suspension, Tires, & Wheels
0
Jun 10, 2017 08:43 AM
grandpas1974
1973 - 1979 F-100 & Larger F-Series Trucks
4
Apr 8, 2016 11:34 AM
19Ford69
1967 - 1972 F-100 & Larger F-Series Trucks
7
Feb 15, 2004 07:12 PM
