Why does my engine smoke at startup?
If you notice white smoke from the exhaust on startup, this means that your car engine is taking on too much fluid from the vacuum pipe or the hose, meaning that your car will be burning excess oil and causing a burnt smell that is noticeable to the drivers and passengers.
What’s the fuel pressure on a Mercedes Benz?
A great and affordable gauge that we have used in the past is this Actron Fuel Pressure Gauge which works on Mercedes-Benz cars. Turn the engine off and connect this gauge to the Schrader valve test port shown in the picture below. Start the car and you should be able to get around 60 psi.
What causes a Mercedes Benz fuel pump to fail?
Typically problems related to the fuel pump and fuel pressure include: Under normal operation conditions, the fuel pump provides a constant flow of fuel. A failing fuel pump typically delivers too little fuel from the gas tank or in certain cases too much. Mercedes-Benz cars use an electrical fuel pump to pump the fuel to the fuel injectors.
Why does my Mercedes engine misfire when I change the spark plug?
Keep this in mind especially if you change the spark plugs in your Mercedes and you are still getting an engine misfire. Fuel pressure can cause engine misfire as well.
What should I do if my Mercedes Benz won’t start?
Start the car and you should be able to get around 60 psi. When the engine is running and when you turn off the engine the pressure should stay steady. Always perform this test on a cold engine. Next, make sure that the fuel injector connections are secure and not loose. Check the fuel pump and the fuel pump relay.
How can you tell if a Mercedes pressure regulator is failing?
One way to tell if it’s a fuel leak is the noticeable smell of fuel when you’re in your Mercedes with it either running or parked. Another telltale sign of fuel pressure regulator problems or damages is black smoke. If the regulator fails or is leaking then it may lead to black smoke coming from the exhaust system.
When does fuel pressure build up in a Mercedes?
You will notice that the fuel pressure didn’t change much when RPMs were kept constant at 4000, 2000 and idle, which is a good sign. *Note that under normal operation the fuel pressure should build up as soon as you turn on the ignition before you even try to crank the engine.
Can a bad fuel pressure regulator cause black smoke?
A faulty fuel pressure regulator can cause the vehicle to run excessively rich, which apart from reducing mpg and performance, can cause the vehicle to produce black smoke from the tailpipe. Black smoke can also be caused by a variety of other issues, so having the vehicle properly diagnosed is highly recommended.
Typically problems related to the fuel pump and fuel pressure include: Under normal operation conditions, the fuel pump provides a constant flow of fuel. A failing fuel pump typically delivers too little fuel from the gas tank or in certain cases too much. Mercedes-Benz cars use an electrical fuel pump to pump the fuel to the fuel injectors.