What causes a vacuum leak in a Mercedes?
Several components are vacuum controlled and can contribute to vacuum leaks. These include the brake booster, transmission, ignition system, and chassis controls (heating, A/C, etc). Later on these systems will be sequentially reconnected to the manifold and the O2 sensor will tell us if they have any leaks.
Where is the vacuum line on a Mercedes Benz?
On the right (passenger) side of the engine, you have one vacuum line that runs from the exhaust gas re-circulation valve to the actuator solenoid on the front of the engine.
Can a vacuum leak cause a check engine light?
This could result in fuel trim problems and a check engine light, possibly with Fuel System Rich DTCs, such as P0172 or P0175. Some older power steering systems idle-up the engine using a vacuum switching valve (VSV), but a vacuum leak might stall the engine during a parking maneuver.
When to replace timing chain on Mercedes SL Class?
If your AC is no longer blowing cold, it could be time for a new receiver/drier. Learn how to replace it. How to replace the timing chain. Over time your engine mounts can take a set and loose their cushioning ability.
Several components are vacuum controlled and can contribute to vacuum leaks. These include the brake booster, transmission, ignition system, and chassis controls (heating, A/C, etc). Later on these systems will be sequentially reconnected to the manifold and the O2 sensor will tell us if they have any leaks.
Why does my Mercedes C class run lean?
You see with a vacuum leak, unmetered air is getting into the engine without passing through the air mass sensor, therefore the computer can’t account for that unmetered air and can’t calculate the correct fuel trim hence more air than fuel and the car runs lean.
How can I Fix my Mercedes W123 vacuum lock?
Use a suitable object, such as a golf tee, bolt, or large nail, and plug off the end of the solid yellow line that is inside the door. Return to your still connected vacuum gauge under the hood and pump up 10 to 15Hg of vacuum.
Where is the vacuum tank in a Mercedes?
Vacuum tank is pictured, in trunk, under hat shelf. Move your vacuum pump to the yellow solid line with no stripes for the next step. With your hand vacuum pump connected to the solid yellow line, with no stripes, you can continue. Make sure the driver’s side door is closed, and turn the key to the lock position.
Why does my Mercedes Benz have a vacuum leak?
This is due to the extra unmetered air flowing through the oil filler port. If there is no change in the vehicle’s idle, then you probably have a vacuum leak somewhere in the system. Don’t forget to check places where vacuum leaks may not be as obvious, such as the oil filler cap, the dipstick and also the valve cover.
Why does my Mercedes C class idle all the time?
This upset the vacuum lines that depend on a vacuum to maintain a steady idle. Check for vacuum leaks with a smoke generator injecting smoke into any vacuum line and see where the smoke comes out. That’s a leak that needs to be plugged.
How to test a Mercedes W123 vacuum lock system?
Pull all three lines from the check valve and test it. Use your mouth to suck and blow in to the single connection side of the check valve. If you can suck AND blow, the valve is bad and will need to be replaced. If air will only travel one way, the valve is OK. Connect your hand vacuum gauge to the yellow line with the grey stripe.