CMCV vacuum hose R&R any ideas?
#1
CMCV vacuum hose R&R any ideas?
I tugged on the little hose on the back pass. side of the engine,(5.4),...
and I could hear the vacuum leak that is apparrently causing the erratic idle, and PO171 & PO174 to come up.
I know this hose is hooked to the Charge motion Control Valve on the back of the manifold,..I can't imagine what it does, as it terminates with some kind of plug or checkvalve??? Haynes say's to remove the entire manifold to get to the CMCV. Have any of you guys ever had to deal with this?
I can see it with a mirror,.I'm thinking maybe looong needle nose from Harbor freight,...bend the tip short,..maybe be able to change it out?????
and I could hear the vacuum leak that is apparrently causing the erratic idle, and PO171 & PO174 to come up.
I know this hose is hooked to the Charge motion Control Valve on the back of the manifold,..I can't imagine what it does, as it terminates with some kind of plug or checkvalve??? Haynes say's to remove the entire manifold to get to the CMCV. Have any of you guys ever had to deal with this?
I can see it with a mirror,.I'm thinking maybe looong needle nose from Harbor freight,...bend the tip short,..maybe be able to change it out?????
#3
It was basically a case of the vacuum fitting getting sloppy from solvent or something getting on it,..and leaking,..I will post a thread with pictures...
#4
loose vacuum fitting
Ok,...here is a picture of the back of an '04 5.4 intake manifold showing the vacuum hose that goes to the pressure switch on the right fuel rail.
The one in the pic. is a new one I picked up at Ford for $37.00,..
2nd pic. is the new vacuum 90,..next to the loose fitting old one, that I suspect got solvent on it.
3rd pic. is simply the engine bay...I get it running tomorrow,..but I'm confident the idle will be fixed...
The one in the pic. is a new one I picked up at Ford for $37.00,..
2nd pic. is the new vacuum 90,..next to the loose fitting old one, that I suspect got solvent on it.
3rd pic. is simply the engine bay...I get it running tomorrow,..but I'm confident the idle will be fixed...
#6
#7
Mine is exactly that, but I don't have this fitting. I just removed the entire intake plenum a couple weeks ago to disassemble and clean the entire CMCV system. The only vacuum fitting on the back lower area of the intake plenum was on the driver side and serves as the vacuum feed for the brake booster. The vacuum hose at the fuel pressure sensor on the fuel rail goes to a different connection on the driver side of the engine. Nothing attached to the lower back passenger side of the intake plenum.
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#8
Mine is exactly that, but I don't have this fitting. I just removed the entire intake plenum a couple weeks ago to disassemble and clean the entire CMCV system. The only vacuum fitting on the back lower area of the intake plenum was on the driver side and serves as the vacuum feed for the brake booster. The vacuum hose at the fuel pressure sensation on the fuel rail goes to a different connection on the driver side of the engine. Nothing attached to the lower back passenger side of the intake plenum.
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#9
#10
I had a rough idle and I wanted to inspect the intake plenum to cylinder head gaskets for leaks. The CMCV flaps were coated with crud so I disassembled them and cleaned everything. It made a huge difference in how my truck runs and the rough idle is gone. No evidence that there was a vacuum leak. 88K miles.
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#11
#12
Pardon my ignorance here. But why do you have to remover the intake manifold to clean and service the CMCV? I don't have one of these trucks, but my wife and I are planning on looking at one on Saturday and unfortunately it has the 5.4. We are thinking of replacing our 98 Expy.
#15
Pardon my ignorance here. But why do you have to remover the intake manifold to clean and service the CMCV? I don't have one of these trucks, but my wife and I are planning on looking at one on Saturday and unfortunately it has the 5.4. We are thinking of replacing our 98 Expy.
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