The engine idle speed appeared idling (Dieselpartsworld) 2016-02-28    

The engine idle speed appeared idling fault maintenance of 300 ~ 800r/min
Idling fault detection
1) the most efficient and effective method is to check the ignition coil secondary winding resistance value.
In table electric block, range selection more than 10k, respectively unplug the cylinder of high pressure line, ambient temperature is 20 DEG C in table two pen, respectively, to check the ignition coil two cylinder synchronous high voltage damping line socket between the resistance value, needle with an ohmmeter are respectively connected with the ignition coil 1, 4 cylinder between high damping line socket and 3, 4 cylinder between high voltage damping wire socket, as significantly beyond the manufacturers specified value, you should replace the ignition coil assembly of step cylinder between the resistance value.
2) were detected in each of the exhaust manifold temperature with infrared thermometer
Which of the exhaust manifold temperature is low, which means that the cylinder combustion is not good. As the two parity cylinder temperature is too low, should replace the ignition coil.
3) the ignition coil shell temperature by infrared thermometer detection.
Ignition coil overheat:
Ignition coil surface temperature greater than 95 DEG C, indicating that the ignition coil internal short circuit, will cause the weak high-pressure fire, may also be causing the car when all of a sudden flameout, but will not cause the lack of cylinder.
Ignition coil cooling:
When starting the ignition coil surface temperature and the ambient temperature is equal to that of internal circuit of ignition coil. The ignition coil is hot or cold must be replaced.