Most of the time, there are some faults when the truck, car owners are able to live together will live together, but there are some faults so that owners can not bear, bear the brunt of the fault is of high consumption, today is to collate all the two classic fault case, hope that we can help.

Fault case one

Fault phenomenon: the vehicle appears two faults in transit. After changing fuel injector, it is found that the fuel consumption is too high during the vehicle running, and the smoke is black when the engine accelerates rapidly.

Detection process:

1, on-site inspection engine fault free code;

2, check the driving information shows that the average fuel consumption of the engine is 49.5L/100 km;

Maintenance process:

In situ test of engine intake pressure and fuel rail pressure were normal, the analysis of historical data, the owner acceleration and throttle opening when the condition does not appear power shortage phenomenon.

According to the fault phenomena reflect the users, check out the Baotou Benz accessories air filter, air inlet pipeline, intercooler and turbocharger intake system were normal. Check the engine rough filter, drain the fuel with a paper cup and find that there is a black impurity in the fuel. Check the engine fine filter, fuel filter fuel poured out many suspended check fuel fuel in the fuel tank when the fuel discharged at the bottom of the tank with a little residual impurities.

Check the fuel injector, 2, 3, 4, found 5 cylinder injector head has more serious carbon deposit, analysis due to poor atomization of injector work led to carbon, 1, 6 cylinder injector head slightly clean.

Resolvent：

Clean up the fuel tank and replace the rough filter, fine filter and fuel injector, to solve the engine fuel consumption, black smoke failure.

Failure case two

Fault phenomenon: Baotou North Benz parts engine abnormal sound, rapid acceleration of black smoke, high fuel consumption. Fault code

Detection process: speed is about 80 km / h, overtaking difficulty, rapid acceleration smoke, abnormal sound disappeared, 2772 fault code appears.

Maintenance process:

Collect and check the color, odor, viscosity and impurity of oil products. Check black smoke situation, brush data, clear 2772 fault code, test urea injection normal. Check the oil and replace the injector, brush write correction code. The inspection found that a large amount of impurities were released from the crude oil filter, and the fuel oil was filtered and filtered.

Repair the vehicle after the commissioning of black smoke disappeared, emergency fuel engine noise in Tata low speed, high speed sound normal, and re check the fuel injector, no abnormal. With the new diesel engine starting test, gas abnormal sound is more obvious, when noise disappeared. Re adjust the intake valve and the exhaust valve automatic clearance, injector correction, injector atomization, oil return data of the normal test; smoke accelerated normal, abnormal sound disappeared.

Sum up:

1, poor oil products lead to poor soot injector.

2, the cold car state operation is not standard, the engine tower sound when the engine is accelerated.

3, Baotou North Benz fittings inlet and exhaust valve clearance gap led to abnormal sound of the engine, after the adjustment of abnormal sound disappeared.