What are the reasons for the lack of acceleration in Jinbei Haise?
4 Answers
Jinbei Haise engine acceleration weakness reasons are as follows: 1. Carbon deposits: Carbon deposits include cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc. These locations are closely related to the engine's power output. When there is excessive carbon buildup inside the engine, the vehicle's ignition energy decreases, intake efficiency drops, ultimately leading to reduced engine power, resulting in sluggish acceleration and muffled sounds. 2. Fuel system: Adding incompatible fuel grades can cause a decrease in the vehicle's output power and reduced performance. Or, due to a blocked fuel tank vent, clogged fuel tank switch, fuel filter, or fuel line between the tank and carburetor, the required fuel supply cannot be met, leading to an overly lean air-fuel mixture and weak engine acceleration. 3. Intake: If the air filter is not cleaned in time after long-term use and becomes clogged, insufficient air volume will result in an overly rich combustible mixture, causing a drop in engine power. For vehicles equipped with turbochargers, if the turbocharging device malfunctions, even when the throttle is applied, the engine will remain sluggish and fail to deliver power. 4. Engine overheating: Engine overheating can lead to poor lubrication, increased mechanical wear, reduced engine power, and weak acceleration.
I've been driving a Jinbei Haise for deliveries for seven or eight years, and most of the time when I encounter a lack of acceleration power, it's due to fuel system or ignition issues. When the fuel pump pressure is insufficient, stepping on the gas pedal feels like stepping on cotton, and the speed increases very slowly. If the ignition coil is aging or the spark plug gap is incorrect, the engine will shake violently, and black smoke will come out of the exhaust pipe. Just the other day, my neighbor's car had too much carbon buildup on the throttle body, and it regained power immediately after cleaning. I remember one time when my car was sluggish while carrying heavy loads, and replacing the clogged fuel filter solved the problem. A faulty air flow meter can also cause this, as the engine control unit messes up the air-fuel ratio. For cars over five years old, it's also necessary to check if the exhaust pipe is clogged with carbon deposits. If you still can't find the issue, you'll need to check the cylinder pressure—a leaking cylinder head gasket is a serious problem.
Our fleet of over a dozen Jinbei Haice vans frequently runs long-distance routes, so we've seen plenty of acceleration issues. The most common problem is the air filter getting clogged black as coal – when you take it out and tap it, soot just falls off. If you don't change the fuel filter for two years, problems are guaranteed; when the fuel line is obstructed, the tachometer gets stuck at 2000 RPM. Spark plugs that haven't been replaced after 60,000 kilometers cause insufficient ignition energy, making the vehicle sputter. One van had an even weirder issue – the fuel pump strainer in the gas tank was clogged with debris, causing intermittent fuel supply. Experienced drivers know that if blue smoke appears during cold starts, it's likely burning oil affecting performance. Vehicles converted to natural gas need special attention to ignition timing. With newer models, you also have to check if the oxygen sensor readings are accurate.
When repairing a Jinbei Haise with poor acceleration, check three key areas first. For the fuel system, inspect the fuel pump pressure, which should normally maintain above 3 kg; insufficient pressure leads to inadequate fuel supply. Use a smoke tester on the intake system to locate leaks, as cracks in the intake pipe can affect the air-fuel ratio. In the ignition system, measure the spark plug gap; a blue spark should jump 7 mm. Exhaust backpressure exceeding 2.5 kg indicates a clogged catalytic converter. Connect an OBD scanner to check long-term fuel trim values; deviations beyond ±10% suggest an air-fuel mixture imbalance. If cylinder pressure measures below 8 kg, consider an engine overhaul. For a slipping clutch, engine RPM surges without a corresponding increase in vehicle speed.
