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#1
12-08-2003, 09:57 AM
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Tracing vacuum leaks
This weekend I went on a campaign to find any vac leaks I might have. Trouble is......I'm not sure what the vac at idle should be on the 4.5. I can pull 15" at 750 rpm idle.
I used my hand pump on all the accessories, including the MAP and P/S pump, and the only leak I have found is the line going to the central locking sytem. If I pump it down to 10" it slowly drops to 5" in about 2 minutes. All the other lines hold 20" for 5 minutes with less then a 2" drop. Then I changed the injector seals (they were really bad) but I am still running 15". Am I OK at 15" or do I need to keep hunting?
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Litton '90 420 SEL (sold) '72 280 SEL 4.5  '98 ML320 (for sale) '86 560SL  '05 Jeep Grand Cherokee Ltd (offroad in style) '87 Chevy Blazer (AZ Pin Strips) 
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#2
12-08-2003, 10:36 AM
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15" is a little low, but I wouldn't start tearing things apart over it. What do you get if you pull the hose for the cabin vacuum and plug the fitting?
You probably don't need me to point out that you probably have one or more bad door elements in your locking system.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#3
12-08-2003, 11:31 AM
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I did plug the hose to the locking system and still at 14/15". Now that I think about it, I couldn't test the trans. modulator because of that banjo fitting.
What is optimum vac on these cars?
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Litton '90 420 SEL (sold) '72 280 SEL 4.5 '98 ML320 (for sale) '86 560SL '05 Jeep Grand Cherokee Ltd (offroad in style) '87 Chevy Blazer (AZ Pin Strips)
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