What to Do If the Newly Replaced Engine Has a Shaking Problem?
4 Answers
If the newly replaced engine has a shaking problem, the first step is to identify the specific cause of the shaking. If the shaking is severe, it is recommended to contact a 4S shop for inspection. Even with a newly replaced engine, issues such as excessively thick engine oil condition, insufficient belt tension, poor fuel quality, or cold engine starts can still cause car shaking. The maintenance methods for the engine include: 1. Using qualified engine oil; 2. Using qualified coolant and antifreeze; 3. Regularly cleaning the radiator scale; 4. Regularly removing engine carbon deposits; 5. Regularly replacing the car's three filters; 6. Maintaining a reasonable engine speed. The engine consists of the valve train, crankshaft-connecting rod mechanism, ignition system, cooling system, lubrication system, and fuel supply system.
I've seen quite a few cases where the car starts shaking after a new engine replacement. More often than not, it's due to installation issues. Loose bolts or misaligned engine mounts can cause vibrations that make the whole car tremble. From my repair experience, novice technicians often overlook these details - like failing to tighten screws to torque specifications causing part looseness. I recommend immediately checking engine mounts and securing bolts for proper installation, while also inspecting transmission connections since improper matching can worsen vibrations. Don't forget that aged engine mounts can amplify abnormal movements - a comprehensive installation quality check is necessary. Otherwise, there's significant risk during high-speed driving. It's best to have a professional shop redo the installation test to ensure all components are correct before driving.
Engine shaking after replacement is often not a major issue, and the ignition system might be the culprit. Loose spark plug wires or poor contact in the ignition coil, especially when new parts aren't properly calibrated, can easily cause misfiring vibrations. My modified engine car once suffered from this, idling like an earthquake, and it turned out to be dirty and clogged fuel injectors causing an imbalance in the air-fuel mixture. You can perform a simple test: after starting the engine, unplug a single spark plug wire—if the shaking worsens, that cylinder is functioning normally. Then, scan the OBD-II for trouble codes; sometimes, a faulty oxygen sensor can also falsely report shaking. For daily maintenance, remember to regularly clean the throttle body and intake system to avoid similar problems.
Engine shaking right after replacement is quite common. I suggest starting with simple checks to save money and hassle. Inspect if the air filter is clogged, affecting airflow, or if the fuel pump pressure is insufficient causing unstable fuel supply - these can all make the engine wobble. I recall a similar case last time where the ECU wasn't reset after engine replacement, causing the computer to malfunction with new parameters. You should test idle and acceleration shaking in a safe place, record it for mechanics to analyze. Avoid blind disassembly - finding a reputable repair shop to diagnose the root cause with proper tools is more efficient.
