A car has been running tens of thousands of kilometers of Honda ACCORDX (Arco De) 2.2 sedan, there is an emergency acceleration flameout, even in the occasional out of the situation, the engine speed is only about 200 rpm, and accompanied by the car, low. There is also one of the most obvious failure is the cold start, can not immediately start air conditioning, an air conditioning immediately turn off, and hot car case start air conditioning engine speed normal, normal operation. The other is the warmer car is relatively long, and the warmth of the speed is only about 1000 turn, significantly lower.
    Failure analysis and troubleshooting:
    Suspected for this failure is the nozzle for a long time the use of leaded gasoline, resulting in blockage caused by carbon deposition, so the cleaning nozzle, while cleaning the throttle body, installed after the failure remains the same. This then removed the idle motor, the fast speed valve was cleaned. In particular, it should be noted that the car's fast idling valve, using a paraffin-type, it has a nylon nut inside the fast speed can be adjusted, that is, it decided to fast idle speed, its fault The phenomenon of a fast idling is low, so it was adjusted. Finished the parts installed on the test. After starting the car, the basic troubleshooting. But still can not immediately start after the cold start air conditioning, this time just the driver introduced a car situation. A few days ago, the driver had to go to a repair shop, said the valve was loud, please adjust the master about the valve, adjust the valve, the emergence of this new fault. Then remove the valve cover, re-check all into the exhaust valve and found that the car's valve clearance only about 0.05 mm, obviously not right, re-adjust the valve clearance by standard. Cold start, immediately open all the normal air conditioning, complete troubleshooting.
    cause of issue:
    As the car throttle body, idling valve (IAC) too much carbon deposition, the formation of idle air intake is insufficient, is the main reason to accelerate the flameout, fast idle valve adjustment is caused by a long time to warm the key to a long time.
    It is noteworthy that, under normal circumstances, people will not think, will not think that way, cold open air conditioning flameout and the valve clearance is too small a direct reason, this is because the Honda car cylinder head because it is aluminum alloy castings , The cold car due to the small gap, resulting in a large valve opening, opening a large amount of air into the large, resulting in mixed gas dilute; in the air conditioning, the engine suddenly increased the load, the need for speed and thick mixture, and this When the provision of lean mixture, will inevitably cause the engine blasting, flameout. And as long as the engine humidity increases, the thermal expansion coefficient of aluminum alloy, it can just make up and offset the valve gap small factor; so this failure in the engine after the hot car does not exist there will not be the main reason.