What's the matter with the flickering fault light of modern automobile engine?

The reasons for the flicker of the modern automobile engine jitter fault light in Pacific Auto Network are: 1, the spark plug is blocked; 2. The throttle valve is too dirty, resulting in too thick mixture; 3. The engine has too much carbon.

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First, the engine shake warning light is on. The reason for this problem is that the spark plug is blocked and replaced. Later, computer tests found three fault codes. The repair shop made it clear to the computer, but the fault light was still on occasionally. Later, it was found that the existing ignition coil was faulty, and it was replaced, and then it was ok.

Second, engine system data flow, compared with the same vehicle data flow one by one, found that the normal vehicle engine intake flow is 2.8g/s, short-term fuel regulation is -2%, long-term fuel regulation is -4%, and throttle opening is 6%, while the faulty vehicle engine intake flow is 2.5g/s, short-term fuel regulation is 2%, long-term fuel regulation is 33%, and throttle opening is 3%. According to the comparison results, it is suspected that the fault is caused by air leakage in the intake system.

3. During the disassembly process, it was unexpectedly found that the surface of the check valve connected with the variable intake manifold was stuck, and it was suspected that the failure was due to the air leakage of the check valve, resulting in the actual intake air volume being greater than that detected by the engine control unit. The check valve was removed and inspected, and it was found that the glue on the surface had been broken. Pick up the glue with a tool and find that the check valve is seriously damaged. After replacing the check valve, it can be debugged after a long trial run.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)