Lexus cars idle instability, weak acceleration

        Symptom: There is a Toyota Lexus brand produced by advanced automobile (using hot wire V8 gasoline injection engine) idle instability, weak acceleration, exhaust pipes and other symptoms of overheating.
        Failure Check: After turning the car fault diagnosis system, fault light alarm. Detected by the decoder fault code is "25" and "26" (i.e., air-fuel ratio A / F is too thick and too lean code), the fault launch crp129 reviews code contradictory. Since the fault code contradictory, repair personnel initially at a loss. Later, the ignition timing is suspected error or bad fuel injector work. If the injector bad job, amount of oil in the cylinder will been uneven; fastening screw loose if the distributor, will inevitably lead to early evening when the combustion condition of the mixture also will good times and bad times when the ignition with gasoline when the supply of similar uneven. Based on the above judgment, will replace all the injectors and re-tighten the distributor and adjust the ignition timing, the fault still exists. Detection engine cylinder pressure, the value of normal. Finally, the use of a vacuum table for intake manifold vacuum ΔPx were tested and found that its value is only 50 kPa (vacuum pressure when idling vcs stable under normal conditions should be 65 kPa -72 kPa), also found on the left side of the ignition coil issued weak spark. So far, the initial determination is left of the ignition coil failure.
        Troubleshooting: Replace the left side of the ignition coil, spark associated with high pressure returned to normal; after re-starting the engine, intake manifold vacuum ΔPx rapid recovery. After eliminating the fault code, test, the engine returns to normal.
        Failure Analysis: Because the left side of the ignition coil to generate a fault, so that the effective working cylinder of the engine is significantly reduced, the power loss is large, resulting in a lower intake manifold vacuum ΔPx, not part of the combustion gas mpps v16 mixture in the exhaust in the exhaust pipe Shiyou the high-temperature gas ignited. Due to different degrees in different conditions in the mixed gas is ignited, it is the oxygen sensor detects the concentration of the mixture of different fault signals.
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