What are the symptoms of a faulty carburetor electronic choke?
2 Answers
The symptoms of a faulty carburetor electronic choke are that the engine can start normally when cold, but after warming up, there may be black smoke from the exhaust pipe, the engine may fail to start, and the vehicle may experience jerking while driving. Below are the specific functions of the electronic choke: 1. During winter or when starting a cold engine in the morning at low temperatures, it is necessary to increase the ratio of gasoline to air to obtain a richer air-fuel mixture, which facilitates smooth engine starting. Therefore, the carburetor is equipped with a starting enrichment device. 2. The motorcycle starting enrichment device mainly comes in two structural forms: the choke valve mechanism and the bypass starting enrichment fuel passage. The choke valve mechanism is a relatively simple mechanical device, generally used in standard motorcycles.
I've repaired many old carburetor-equipped vehicles, and the most obvious symptom of a faulty electronic choke is extreme difficulty starting when cold. Once, I helped a customer with an old motorcycle who said he had to pull the choke lever dozens of times in the morning just to get it started. After starting, the idle would fluctuate wildly, and sometimes you could smell strong gasoline fumes from the exhaust. This usually happens when the choke is stuck in the always-open position, causing the air-fuel mixture to be too lean during cold starts. If the problem disappears after the engine warms up, it's almost certainly the thermal element in the electronic choke that's failed. If not repaired promptly, the carburetor will continue to deliver excess fuel, potentially increasing fuel consumption by up to 30%. I recommend checking the choke's resistance with a multimeter or directly inspecting whether the wax valve is stuck.
