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. :-banghead 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????? |
Where do you suspect the leak to be? is it at the connection behind the intake, or can you determine any cracks/breaks in the hose?
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Originally Posted by ShootinOK
(Post 9928663)
Where do you suspect the leak to be? is it at the connection behind the intake, or can you determine any cracks/breaks in the hose?
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loose vacuum fitting
3 Attachment(s)
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... |
I know this is an old thread, but they must have changed this for the 2005+ (or maybe the 2004 new body style) because my 2005 doesn't have this fitting.
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Originally Posted by VTX1800N1
(Post 14547379)
I know this is an old thread, but they must have changed this for the 2005+ (or maybe the 2004 new body style) because my 2005 doesn't have this fitting.
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Originally Posted by ojai150
(Post 14547456)
If it is a 5.4 2005. It has this fitting Sent from my XT1080 using IB AutoGroup |
Originally Posted by VTX1800N1
(Post 14547841)
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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My '05 doesn't have that port either. Well it's there, but not drilled out. I don't have that heat shielding insulation around the manifold either. Can other '05+ owners verify this?, just curious...
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Originally Posted by ojai150
(Post 14547906)
Hmmmm,...that's a new one on me ,...why did you pull the intake ? Sent from my XT1080 using IB AutoGroup |
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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Originally Posted by paredneck33
(Post 14548961)
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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Here's a pic...(notice lack of the insulation around the manifold)
https://cimg7.ibsrv.net/gimg/www.for...2169696c03.jpg |
oh ok thanks guys. My next question is, are the intake gaskets reusable? or do they need to be replaced each time the intake is removed?
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Originally Posted by paredneck33
(Post 14548961)
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.
Sent from my XT1080 using IB AutoGroup |
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