Quote:
Originally Posted by Diesel911
As previously stated a low vacuum can often be the Check Valve the screws into the Vacuum Pump. However, a new Vacuum Pump I believe comes with a new check valve so one would think that would make a check valve issue unlikely.
They way to know for sure would be to remove the Tubing where it goes into the Vacuum Pump and use one of those tapered rubber adapters and push that into the Vacuum Pump Check Valve so it seals and measure the exact vacuum that the vacuum pump puts out.
If you are getting good vacuum there thest the Brake Booster to see if it holds vacuum. After that all that is left is the main vacuum line.
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I agree, starting at the source and working your way outward is the most efficient way to examine a vacuum system. Pump, check valve, main vac line, brake booster then each branch off the main trunk line.
On an SD I would remove and isolate the the cabin and that horrible mess of pods and actuators under the dash from the system first.