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Bad experts teach you why cold car troubleshooting

Car required before preheating, the athletes warmed up before the match, who also has a political character. According to the engine coolant temperature can be divided into two States, below 70 degrees is cold, above 70 degrees is hot. Cold common faults there are three: cold car not starting, cold idle vibration and cold bad, many drivers for these failures at a loss, we find an analysis below.

cold car not start  

in accordance with the Beijing local standard, at ambient temperature-5 ° c or more, each time you use the starter for 5 seconds, start up to three times and engine should start normally. This is the early cars, and car technology greatly improved today, cold start is not a difficult thing, but in my opinion, using starters no more than 5 seconds at a time as normal, cannot point motors will refund key is on the, for more than two vehicles belonging to this condition is not normal.

cold car not start due to:

① starting system failures, such as insufficient battery power, damaged or faulty starter circuit Starter;

II engine mechanical failure, such as the intake manifold leak, enclosed between the piston and cylinder is not strict, lax valve closes, the intake valve and the intake manifold carbon, lead into gasoline rather than get into the combustion chamber by carbon adsorption;

③ engine management system fault, such as speed sensor signal, incorrect water temperature signal, line connection is bad

④   ignition system malfunction, for example carbon spark plug gap between too much or not, high tension line leakage, ignition coil is damaged;

⑤ oil system faults, such as insufficient to maintain pressure, fuel injector leak or blockage.

cold idle vibration of  

If the cold idle vibration and hot car idle vibration at the same time, you get rid of hot car idle wobbling failure. Defines whether jitter should observe whether the engine tachometer pointer swings, or reading data blocks in the engine speed, engine pads idle vibration of engine damage will occur, especially in automatic car when put into forward gear after.

cold idle vibration due to:

① engine mechanical failure, such as the cylinder pressure is not uniform;

II intake system failure, such as the intake manifold leak; carbon intake valve and the intake manifold, throttle body and intake pipe inner wall the contamination;

③ engine management system fault, such as incorrect water temperature, intake air temperature signal, line fault etc;

④ ignition system malfunction, for example carbon spark plug gap between too much or not, high voltage cable, distributor CAP, leak, ignition coil is damaged;

⑤ oil system faults, such as fuel injection nozzle closed due to nozzle too much colloidal carbon is not strict or blockage.

cold bad  

while many auto makers user manual that can be started without preheating after cold starts, but in my opinion, slightly warm after the engine started

3-5 minutes is good, because it reduces engine wear, small cars can make sufficient engine power when starting. Throttle up cold start is the wrong way, and appears to accelerate the vehicle may have been avoided, if the cold slow refueling started there was a car belonging to failure.

cold bad reasons:

① engine mechanical fault, such as cylinder low pressure results in reducing engine power, in a cold state is more prominent and the intake valve and the intake manifold excessive carbon deposition;

② inlet valve and the intake manifold carbon too much lead into gasoline rather than get into the combustion chamber by carbon adsorption;

③ engine management system fault, such as incorrect water temperature, intake air temperature signal, line fault etc;

④ ignition system malfunction, for example carbon spark plug gap between too much or not, high voltage cable, distributor CAP, leak, ignition coil is damaged;

⑤ oil system faults, such as fuel injection nozzle closed due to nozzle too much colloidal carbon is not strict or blockage.

above faults should be followed after the first electric machine, simplified the complex principles of diagnosis