FAQs—Mercedes Benz 280SEL
My Mercedes Benz 280SEL has been sitting in my garage for a few months now. I'm driving a new car, so no one's using it. When I tried starting it the other day, the car seems to lack power. I already cleaned the pipes to the best that I can, but I still got the same problem. Any idea what's going on?
Since your car's been sitting for a long time, rust must have accumulated in some parts of it. Rust can cause blockage in the return pipe. As a result, the blocked return pipe is creating high control pressure at the fuel distributor which could seriously impact the engine's performance. Even if you've already tried cleaning the pipes, there could still be rust. Because of the way these pipes are configured, it's difficult to fully access and clean it. If it's not possible to clean the return pipes thoroughly, the best solution is to have the entire fuel tank replaced.
I've driven my Mercedes Benz 280SEL this morning to pick something up at the office. When I restarted it, it wouldn't budge until I stepped on the gas pedal all the way. It stalled and lost power when I was near the garage. There's also some kind of noise coming from the rear tire. Can you help me pinpoint the problem here?
A no start problem is often a sign that you have a bad fuel pump in your engine. However, it's not always the case. Worn brushes, commutators, and broken or loose windings in the fuel pump can also cause the vehicle to stall. Fuel pump problems can be intermittent and difficult to diagnose. Often, the vehicle will start again after the pump cools down. If you have an older model vehicle, the problem could be because of clogged filter. In this case, you will need a new fuel pump. But, don't just replace the pump if you're not yet sure that it's the culprit. Sometimes, the car's security system can disable the fuel pump so it won't start—this will prevent anyone from trying to steal your vehicle and successfully driving away with it.
I noticed that my 280SEL is beginning to sound louder than it used to whenever I'm driving. I also noticed some strange smell coming from underneath the car. What should I do?
Your car was designed to work silently or with just a minimal sound. If you noticed yours to be getting louder every day, it's time to have the mufflers checked. They are exposed to a great deal of pressure and heat from engine operation. Worn mufflers can get rusty, cracked, or have holes that can all cause the muffler to fail. The bad odor can be because of carbon monoxide escaping from holes in the muffler or exhaust pipe. This requires immediate repair since these fumes, if breathed long enough, can be fatal.
A few days ago, my 280SEL begun to shake so badly when I put it on idle; this causes vibrations all over the car and in the steering wheel. It went away eventually, but the engine is now having a hard time starting and would stall after it's on idle especially when the air conditioning is on. Any idea what's wrong with the car?
What you have described is known as misfire. It's a drivability problem that can be hard to diagnose at times. When misfires occur, you will notice that the performance of your vehicle suffers along with fuel economy, idle quality, and emissions. There is also a high level of hydrocarbons in the exhaust; you will also fail an emission test. If the misfires have become steady, what you need to do is to isolate the misfiring cylinder. You can do this either by traditional means, which involve pulling plug wires to identify the weak cylinder, or you can use a scan tool if your car is outfitted with a modern OBDII system.