Camry engine is filled with water May 4th, 2018   [viewed 62 times]

Symptoms: Check the engine fault light and side-slip indicator to light up the alarm. After the technician received the car, the two fault lights were still on. The idle engine runs smoothly.

Open the cover and find that the direction of the battery connection terminal is abnormal, the two cans of the canister solenoid valve are connected incorrectly, and there are many installation errors. The customer was then asked to know that the car's engine was damaged due to heavy rain and drowning. It was xhorse lighted after a small repair shop had repaired the fault lamp within 3 days. After obtaining the customer's consent, the wrong alignment and piping were corrected first. After the test, the fault light was still on and the fault code was still P0012. It is determined that there is an actual fault in the engine system.

Fault diagnosis: Judging from the above preliminary inspection, the direction of the fault should be on the timing and on the VVT-i system. Considering that the engine has just been overhauled, there is a high possibility that timing and error will be correct. The valve chamber cover was removed and the cgdi timing and tension of the chain were checked. No abnormality was found. It seems that the timing lag should be on the VVT-i system. The active test of the VVT-i control system was immediately conducted through IT-II, and when the engine was idling, the intake camshaft advance angle was 0° when 49% of the VVT-i actuator was intentionally controlled by IT-II. The engine idle speed is still running smoothly. In normal circumstances, when the forward advance reaches 49%, due to the transitional overlap of the intake and exhaust valve opening angles, excessive exhaust gas enters the cylinder, and the engine's idle speed should be severely unstable and extinguished. It can be understood that the VVT-i system does not advance or retard the intake camshaft as instructed.

Possible causes of analysis are: 1VVT-i actuator stuck. 2VVT-i system oil filter plugged 3VVT-i oil engine oil blockage. 4 Control solenoid valve stuck or faulty. According to the degree of difficulty in construction, the solenoid valve was first dismantled for electrical testing, and the result was that the valve core was not stuck. Then, the oil filter of the VVT-i was dismantled. No plugging or foreign matter was found. Is this failure a failure of the VVT-i actuator or the blockage of the oil passage? To find out whether the oil gallery is blocked, think of a way to inject compressed air into the oil passage hole of the VVT-i strainer. As a result, the oil hole in the autel md808 cylinder head vented, indicating that the oil passage of the VVT-i was not blocked. Is it true that the VVT-i actuator is really broken? Considering that the amount of work required to disassemble the VVT-i actuator is too large.

Ask the customer again about the process of overhaul. The customer reflected that the water had bent a connecting rod and changed the 4 connecting rods and 4 piston overhaul kits. The cylinder head did not move. The camshaft has not been decomposed. The VVT-i actuator itself is not likely to fail. It seems that the failure must be re-analyzed. After careful observation of the VVT-i solenoid valve, it xhorse key machine suddenly became apparent (as shown in Fig. 2) that the original solenoid valve spool was accidentally rotated at a certain angle to form a seal between the solenoid valve and the oil hole in the cylinder head. This caused the failure. After the last replacement of the VVT-i solenoid valve, engine oil and engine oil grid, the VVT-i was tested actively. The test was passed, the engine was turned off, and the fault was eliminated.

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