PAUL T Posted August 29, 2012 Report Share Posted August 29, 2012 I found a vacuum leak in my in-laws 94 Deville. It is the hose that comes out of the passengers side of the intake manofold and connects on the rear bank. What does this do and how do I get to it? It looks as if the itake manifold will have to be loosened or taken off. Does anyone have a picture or diagram of it? Link to comment Share on other sites More sharing options...
Cadillac Jim Posted August 30, 2012 Report Share Posted August 30, 2012 I believe that the 1994 DeVille has the 4.9 OHV V8. This sounds like the PCV valve hose, which I would venture comes out of the throttle body and goes to the PCV valve which is probably insterted into a grommet in the valve cover. Anyone with a 1994 FSM or a similar motor in their car? -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
PAUL T Posted August 31, 2012 Author Report Share Posted August 31, 2012 I found a vacuum leak in my in-laws 94 Deville. It is the hose that comes out of the passengers side of the intake manofold and connects on the rear bank. What does this do and how do I get to it? It looks as if the itake manifold will have to be loosened or taken off. Does anyone have a picture or diagram of it? I am sorry guys, I gave you the wrong car. It is a 2004 Deville. I think I have figured it out. The problem is the rubber elbow that connects to the vacuum tube in the end of the intake manifold and goes to the PCV valve. It is split causing a vacuum leak. Link to comment Share on other sites More sharing options...
PAUL T Posted September 4, 2012 Author Report Share Posted September 4, 2012 Update: Fixed the 2004 Deville vacuum leak. Had to take the intake manifold out to get to the passenger side end to fix a elbow that ripped open somehow. Fuel rail with the injectors was popped out to get to the manifold bolts. Replaced the rubber elbow with a hose with an elbow molded in it. No parts were left over after the repair. Everything was tightened back down, no more codes, and running great. Gas mileage should improve also. Thanks for the help. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted September 4, 2012 Report Share Posted September 4, 2012 -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Texas Jim Posted September 4, 2012 Report Share Posted September 4, 2012 No parts left over is always a good thing.. Link to comment Share on other sites More sharing options...
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