What does the fault code 84 on the Buick Excelle mean?
2 Answers
The code indicates reduced engine power, and it is recommended to check the spark plugs. Below are the relevant details: 1. Carbon buildup issue: The carbon buildup here includes cylinder carbon buildup, throttle carbon buildup, spark plug carbon buildup, and intake carbon buildup. These areas are directly 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 and symptoms like weak idling. 2. Engine maintenance precautions: The air filter needs to be replaced regularly. If the engine's output power still seems lower than before after replacing the air filter, then it is necessary to check if the intake pipe is too dirty. Dust and particles entering the engine can wear down engine components.
I've encountered this issue on the driveway. The fault code 84 in the Buick Excelle usually indicates a stuck or failed AC compressor relay. The relay controls the compressor current, and when it gets stuck in the on or off position, the AC may not cool or could blow hot air, which is annoying while driving. The check method is simple: open the engine compartment fuse box, locate the AC relay position, pull it out to check for burn marks or looseness, and try replacing it with a new one. The cost isn't high—just a few dozen yuan for a relay. But be cautious about the underlying causes, such as unstable battery voltage or aging wiring, as ignoring them long-term could damage the compressor and lead to bigger repairs. I recommend addressing it promptly—don't wait until summer hits to panic. When doing it yourself, wear protective gloves to avoid electric shock or short-circuit risks. Regular maintenance can also prevent similar faults, such as cleaning the system interior to keep it dry.
