What are the common problems with the 420 Xichai engine?

1 Answers
VonCaleb
07/29/25 7:12pm
420 Xichai engine has the following common problems: 1. Coolant entering the fuel tank: The fuel-water separator turns green during operation, indicating a lack of coolant in the radiator. In more severe cases, coolant may spray into the combustion chamber, causing issues like backfiring and smoke during acceleration. This fault is caused by the aging of the water jacket gasket. Factors such as engine overheating or substandard coolant can accelerate the aging process of the gasket. 2. Fuel injector failure: After coasting downhill in gear and then attempting to accelerate, the engine cannot rev beyond approximately 1500 RPM. This is due to excessive fuel injector return flow, causing the metering unit to exceed its maximum fuel supply capacity. The ECU directly controls the engine speed, resulting in a speed limit. The issue can be temporarily resolved by turning the ignition key off and on again. The correct solution is to replace or repair the fuel injector.
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