Questions & Answers for: GMC Yukon XL vacuum leaks

...with in dash screen says service brake booster In relation to the brake booster, try looking at the vacuum hose that runs from the inlet manifold to the brake booster. It could have become hard and ...

...Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.) Mass Airflow Sensor (MAF) Plugged Fuel Filter or weak Fuel Pump Plugged or dirty Fuel Injectors a lot of auto parts palces will ...

...goes through the firewall, i believe there is a small plastic check valve that sometimes leaks. Its just going to be a matter of following the path of vacuum all the way to the control unit if ...

engine idles rough Check for a vacuum leak. If the vehicle is over 15 years old, replace all under-hood vacuum hoses. You can find a vacuum leak by spraying carburetor cleaner on all vacuum ...

...vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it ...

rough idle and engine vibraton Some gaskets have been known to fail and cause vacuum leaks, it happened on mine. I took it in to have them checked/replaced.

...directs airflow through heater is not working, probably because the actuator is bad or you have a vacuum leak. Check line under hood which goes to vacuum reservoir for vacuum, and check one way ...

...can I fix this? I think the flapper doors which direct the air flow are all controlled by engine vacuum which is piped through a one way valve (check valve), then into a vacuum resivoir, then to ...

no air blowing out front vents,, back vents only... which a/c fuse is too control vents.. Not a fuse issue. Likely blend air door actuator failed or vacuum leak.

...in the fuel pump itself. The regulator does not come into effect until the engine is running and a vacuum supply is produced to it. If the regulator is leaking internally, it could send fuel back to ...