What causes the Ford Mondeo's tachometer to shake and the car to vibrate?
4 Answers
Ford Mondeo's tachometer shaking and the car vibrating is caused by a faulty oxygen sensor in the vehicle. Here is some additional information: 1. The tachometer is one of the essential instruments in the mechanical industry, used to measure the speed, linear velocity, or frequency of a motor. 2. The tachometer processes the received digital pulse signals (emitted by the sensor) and directly reads them into the CPU's counting port. The software then calculates the speed and the corresponding position of the pointer. Through the CPU's control port, the signal is amplified to drive the stepper motor to rotate in both positive and negative directions, indicating the corresponding speed value (the pointer is directly installed on the stepper motor's rotating shaft). The stepper motor moves only 1/3 degree per step.
My Ford Mondeo had the same issue before, with the tachometer going haywire and the car shaking violently, which really scared me. The shaking was especially noticeable at idle or during acceleration, feeling like the engine was dancing. It could be a fault in the ignition system—either the spark plugs were worn out or the ignition coils were failing, preventing proper ignition and causing unstable engine operation. After driving on the highway a few times, the problem worsened, the engine sound became hoarse, and fuel consumption increased. Later, I took it to a repair shop where the mechanic used a diagnostic tool to check the fault codes and confirmed the spark plugs were burnt out. After replacing them, the engine ran smoothly again. If such minor issues aren’t addressed promptly, engine wear accelerates, and even the tires could be damaged. I suggest you stop and check the engine oil and spark plugs to avoid letting the problem escalate into a bigger safety hazard.
Buddy, I've been driving for almost 20 years, and Ford Mondeo shaking is nothing new. It's most likely the engine mount rubber pads aging, transmitting vibrations directly into the cabin - sitting there feels like being on a massage chair. It could also be clogged fuel injectors causing unstable oil pressure that makes the tachometer dance. Once on the highway, my car shook so bad the steering wheel vibrated, nearly causing a loss of control. After replacing the mounts during repairs, it was fine, and checking the fuel system can prevent similar issues. Don't underestimate vibrations; prolonged exposure can cause severe engine wear and drivetrain problems, making it drive like a tractor. Get a professional shop to do a full inspection ASAP - small spending now saves big trouble later.
I think this is mostly a fuel injector issue, causing unstable fuel supply to the engine and making the tachometer fluctuate. For diagnosis, first use an OBD tool to check for trouble codes, or see if the check engine light is on. A faulty fuel pump could also cause shaking, especially noticeable at idle. A minor repair can fix it, but delaying will cause fuel consumption to skyrocket.
