What Causes the Engine to Roar in First Gear?

[TaliaLee]

Engine roaring may be caused by severe carbon deposits in the engine, abnormal cylinder operation, or excessive oil consumption leading to insufficient lubrication. Severe Carbon Deposits: Inspect the vehicle's intake system to check if the air filter is dirty or if the vacuum tubes are aged and leaking. Clean the throttle body to avoid affecting the air intake volume. Abnormal Cylinder Operation: Examine the vehicle's exhaust system to check if the catalytic converter is clogged. Clean or replace it promptly if necessary. Excessive Oil Consumption: Verify whether the engine oil used meets the required specifications. Using oil with a higher viscosity than recommended can cause the engine to sound sluggish.