Noise: Clicking while decelerating from 20 miles per hour to a complete stop. Cause: Worn carrier case-side gear bores. Noise: Rumble or clicking that gets worse during hard turns. Cause: Bad wheel bearings. Noise: Driveline squeaking or grinding at any speed. Cause: Worn or damaged U-joints. 1995 Mercedes E300D won't accelerate. I have a 1995 E300 diesel with 167,000 miles. Two month ago a gas station sold me diesel with water. One hour after my car wouldn't start when I never had any problem starting the car before. From there I cleaned twice the fuel tank and change the fuel tank filter, the fuel pre-filter and the fuel filter Check the transmission oil after the engine has reached operating temperature (drive or idle your vehicle for 20 minutes or more). Turn off the engine and allow the engine to sit for three or five minutes. Then pull the transmission oil dipstick. Use a rag to wipe the tip of the dipstick clean of oil. What it could mean: This is most likely a wheel bearing noise. It’s one of those car sounds that’s often mistaken for an engine noise, and one way you can tell is to watch your RPM gauge. As you accelerate, the RPM and speed gauges rise. Coast at a set speed, let off the gas pedal and watch the RPM gauge drop. The most common causes for slow acceleration in Mercedes-Benz S-Class are clogged air filter, dirty mass air flow sensor (MAF), clogged fuel filter, fuel pump malfunction, faulty oxygen sensor, dirty throttle body, worn spark plugs and clogged catalytic converter. Less common causes are faulty throttle position sensor (TPS), bad ignition coils Your power steering and A/C will also come offline. Although you may survive without the A/C, the loss of power steering can be a serious issue. 3) Overheating engine. The serpentine belt also drives the water pump. This component is responsible for cooling the engine. If it doesn't receive enough power, your engine's temperature will keep rising. shazanger Discussion starter. 33 posts · Joined 2009. #1 · Dec 11, 2009 (Edited) My 1985 300D is having some issues accelerating up hill. I can accelerate when going below 50mph, though it very slow. Once I go above 50mph up hill, it stays pretty steady and struggles. If I am over 60mph, the car will gradually slow down. In reality, as the gas pedal is pressed down, a throttle valve is opened in the acceleration system. When this valve is open, the air is let into the engine bay. Simultaneously, the engine control unit in the car senses this and opens itself. By doing so, the engine control unit allows for a precise amount of fuel to be injected into each of Step Six: Insert the new MAF sensor and reverse the disassembly steps to complete the installation. Step Seven: Clear the codes, start the engine, and go for a test drive to see if the car jerks when accelerating. If not, the replacement MAF sensor likely fixed the imbalance in the fuel/air mixture. 7. Open the throttle side up and inspect the series of gears inside , re grease (I used a lithium based grease) and re assemble. no need to open the other half where the cable enters. I have written the whole problem up so it should be in the archives . Raoul. Flosshilde 90/420se daily drive. Now over 400.000km. PCKds.