Mercedes Benz is to automobiles what the Waldorf-Astoria is to New York Hotels; classic, refined, expensive, but oh-so-worth-it. If you are fortunate enough to have the privilege to drive one of these masterpieces, you certainly do not want to let engine problems slow you down. Unfortunately, even the best automobiles can experience issues related to wear and tear. For the super-powerful V12 engine, that wear and tear might happen more quickly than you like. In this article, we’ll look at what causes problems with the V12 engine and how to fix it.
Why Do V12 Engines Have Problems?
V12 engines are powerful engines, but they are also large and heavy. In today’s day and age, even the V8 is considered to be a large, gas-guzzling engine. Where the V8 fires four times per cycle, a V12 has to fire six times per cycle. In a combustion engine, that means all of the engine components have to work in sync and faster than the V8. When running perfectly, it will give an incredibly smooth ride, but when something goes wrong, there’s a lot more that needs to be fixed.
How do you find the cause and resolve a misfiring engine?
The most common issue with the Mercedes Benz V12 is engine misfiring. Finding the cause of this can be challenging without high-end diagnostic tools, but it is possible. The route to determining what the problem is and to solving the problem are actually one and the same, if you are doing this on your own. The rule is to start with the items that are simple and cheap and work towards those that are complex and expensive.
Safety Concerns Working With Engines
If you are going to attempt to do any of this on your own, please follow all of the recommended safety precautions, including but not limited to safety goggles, gloves, etc. Here are the items to look at in order:
1. Spark Plugs
With a V12 engine, there are 12 spark plugs. You want to look at each one to see if it is wearing properly. If one is discolored either from getting too hot or not hot enough, that’s a clue to which cylinder is misfiring. In some cases, especially in older vehicles or vehicles with high miles, you might want to change out all of the spark plugs. Before you do that, if there is one that is discolored, swap it with another one and run the car again. If the spark plug in the same location of the swap is now discolored when it wasn’t before, then you know the issue isn’t the spark plug.
2. Spark Plug Wires
Next, you want to check the wires. While running the engine with the hood up in the dark, watch for sparks. Next mist them with water, in the same conditions, and watch again. If anything sparks, then the wire needs to be replaced. Even if nothing sparks, turn on the lights and check them for cracks. Most wires have a date stamped on them that will tell you how old they are. Old doesn’t always mean bad, but wires are not expensive, so it might be worth replacing them anyway. You should also test them by putting pressure about 5 inches apart and squeezing gently. The wire should easily form an arch without cracking the casing of the wire.
3. Ignition Coils
The instructions for checking spark plugs and wires are not difficult, but with the ignition coils, it starts getting complicated. You will need an ohmmeter (or a multimeter) to test each coil. You will also need to look up the range for a “good” ohms reading for your Mercedes model, because it is different for every vehicle. If you’ve checked the ignition coils and they are not the problem, then you are ready to move on to the fuel system.
4. Fuel Injectors
At this point, we recommend that you have your car towed to our shop. Doing a DIY for fuel injectors will be messy and time consuming. You would have to pull the fuel injectors and test them with the ohmmeter or multimeter, which should read between 12-16 ohms. If you need to replace a fuel injector, call us. We have ASE-certified technicians on hand to help you.
Bavarian Auto Can Do This For You
Bavarian Auto is located in Chattanooga, TN and has over 120 years of combined experience with its ASE-certified technicians. We’ve been a family-owned business since opening in 1981 and welcome new and returning customers from Chattanooga, Ootelwah, Hixson, and surrounding communities. We would love to help you with your automobile. Call or stop in. We can’t wait to meet you!