Why does the car feel slower after replacing the timing belt?

2 Answers
MacDelaney
07/28/25 7:55pm
Here are the reasons for insufficient power after timing belt replacement: 1. Excessive carbon deposits: Severe carbon buildup in the engine cylinders can lead to spark plug clogging and valve blockage. Solution: Clean the engine cylinders. 2. Fuel system malfunction: Unstable fuel pressure can cause inconsistent air-fuel mixture concentration, resulting in unstable idling. Solution: Consider replacing the fuel filter. 3. The filter element may become clogged after prolonged use. Also check the fuel pressure bypassing the fuel filter. If abnormal, it indicates a fuel pump issue. 4. Aging engine mounts: If engine vibration worsens significantly but power doesn't decrease accordingly.
Was this review help?
11
2
Share
StAdam
08/12/25 12:41am
A few days after replacing the timing belt, I noticed the car's acceleration became very sluggish. When pressing the accelerator, the RPM rises extremely slowly. I suspect the mechanic might have misaligned the belt teeth during installation, causing incorrect engine ignition timing. I've heard that being off by just a few teeth can significantly reduce power output. Additionally, improper tension adjustment of the new belt could also be a factor - too loose may cause slippage, while too tight increases resistance. I've also checked other components, like whether the newly replaced tensioner pulley rotates smoothly, since issues with related parts are common. If all else fails, I'll have to return to the repair shop for a timing readjustment. Prolonging this issue could potentially damage the engine.
Was this review help?
2
2
Share
Expand All
More Forum Discussions

What procedures are required for vehicle file transfer?

First, the vehicle owner needs to apply at the vehicle management office, then obtain a rubbing card for vehicle identification number rubbing. After completing the rubbing, submit the relevant documents to process the procedures. After 3 working days, collect the vehicle file with the receipt. For vehicles that pass inspection, the original license plates and vehicle license will also be confiscated. Documents required for file transfer: Vehicle license, motor vehicle registration certificate, motor vehicle registration supplementary form, vehicle purchase tax certificate. Original ID cards of both the original owner and new owner. If the buyer is from another city, a residence permit valid for at least one year is required. The original owner's purchase invoice, and if the buyer is a company, business license and official seal are also needed. The vehicle must be present. If the insurance is valid, insurance transfer is also required. For vehicle registration, the original vehicle file, motor vehicle registration certificate, insurance policy, and owner's identity proof are also needed. Applicable situations for vehicle file transfer: Vehicle file transfer refers to the transfer of a local vehicle to another person who will register it with an out-of-town license plate instead of a local one. In this case, file transfer procedures must be completed.
5
3
Share

What lights to use when passing through an intersection?

Use low beam when passing through an intersection. Nighttime light usage: When driving on well-lit roads, low beam should be used; when following another vehicle, low beam is also necessary to allow the preceding vehicle to observe the rear through the rearview mirror; when meeting an oncoming vehicle within 150 meters, it is also required to switch from high beam to low beam. Passing through special road sections: When driving at night through slopes, arched bridges, crosswalks, sharp curves, uphill roads, or when overtaking vehicles ahead, it is necessary to alternate between high and low beams, mainly to alert other vehicles that your vehicle is preparing to pass through that section of the road.
20
5
Share

Why does the tire pressure alarm go off at 1.8?

The reason for the tire pressure alarm at 1.8 bar is due to prolonged underinflation, which triggers the tire pressure monitoring light. Check if the tire pressure sensor is functioning properly. Hazards of low tire pressure: Increased friction coefficient with the road surface, leading to higher fuel consumption; Causes the steering wheel to feel heavy and may lead to drifting, compromising driving safety; Increases movement in various parts of the tire, causing excessive rolling and abnormal heat generation; Reduces the functionality of the cords and rubber, leading to delamination or cord breakage, excessive friction with the rim, resulting in bead damage and abnormal wear; Multiplies the friction between the tire and the ground, causing a sharp rise in tire temperature, softening the tire, and drastically reducing its strength. High-speed driving may lead to a blowout; Increases tire body deformation, making the tire sidewalls prone to cracking, while generating flexing movements that cause excessive heat, accelerating rubber aging, fatigue of the cord layers, and cord breakage. It also increases the tire's contact area with the ground, accelerating shoulder wear. Solutions for insufficient tire pressure: If no damage is visible, simply inflate to the normal tire pressure and reset the tire pressure system; If a puncture is found during inspection, drive to a tire shop promptly for repair, then reinflate; If the tire pressure warning reappears after inflation without any punctures, it may be due to air leakage caused by rim deformation. It is recommended to inspect the rim and replace it if necessary.
12
0
Share

What Causes the Reversing Camera to Not Respond When the Car is in Reverse Gear?

Damage to the reversing camera's probe, signal line faults in the camera, or malfunctions in the gear position sensor can all cause the reversing camera to not respond. Causes: Damage to the reversing camera's probe, signal line faults in the camera, malfunctions in the gear position sensor, poor line contact, aging of the frequency power line, reduced chip photosensitivity due to prolonged use of the reversing camera, obstruction of the reversing camera by foreign objects, or malfunction of the reversing camera display screen. Solutions: When the car is just started, it might interfere with the operation of the reversing camera. Try restarting to see if the situation improves. It could also be electromagnetic interference from other electronic devices in the car. Try turning off the radio or music player before starting again.
12
4
Share

What is 100cc?

100CC equals 100 milliliters. Conversion of volume units: Milliliter is a unit of volume. 1L=1000mL. 1000 milliliters=1000 cubic centimeters=1 cubic decimeter. 1 milliliter=1CC. 1 milliliter of liquid water=1 cubic centimeter of liquid water. 1 milliliter=1 cubic centimeter. Explanation of CC: CC is the English abbreviation for cubic centimeter. CC is a measure of volume, while milliliter is a measure of capacity. 100cc of water equals 100ml of water, which is 0.1 liters of water. For other substances, due to different densities, direct conversion is not possible.
1
0
Share

What does TCU mean?

Transmission Control Unit (TCU), the automatic transmission control unit, is commonly used in AMT, AT, DCT, CVT and other automatic transmissions to achieve automatic shifting control, making driving easier. It is generally installed inside the transmission. Only vehicles with automatic transmissions have a TCU. The TCU can detect certain data, such as engine speed and vehicle speed. Using this data, the TCU can adjust the transmission to perform gear shifts. Functions of the TCU: Target gear (ratio) decision; actuator control; fault diagnosis; fault handling, etc. The TCU consists of a 16-bit or 32-bit processor, signal processing circuits, power drive modules, etc., and must undergo strict electromagnetic compatibility testing. The operating temperature depends on the installation location. If installed in the cabin, the required temperature range is lower, typically -40°C to 90°C. If installed in the engine compartment, the temperature range is usually -40°C to 140°C. The TCU communicates with the ECU, ABS/ESP, BCU, and other onboard computers via the CAN bus. In case of transmission failure, it controls engine torque, limits gears, and enables the limp-home function. Major TCU suppliers include Continental Automotive, Bosch Automotive, Delphi, Denso, Hitachi, etc. TCUs have different shift logic groups. Many automatic transmissions have an S-gear, which is the sport mode. When sport mode is activated, the transmission's shift logic changes, and the engine's operating mode adjusts accordingly. During normal operation, most transmissions shift between 2000 RPM and 3000 RPM. In sport mode, the transmission does not shift until the engine reaches the redline. The transmission is a crucial component of a vehicle. A car's overall driving performance depends not only on the engine and chassis but also largely on the transmission. A high-quality transmission can compensate for engine shortcomings, while a poor one can hinder engine performance. Having a transmission with intelligent shift logic, fast shift speeds, and durability is essential.
17
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.