Engine rpm drops at idle speed
Engine RPMs Dropping Idle It is worth remembering that a drop in engine RPMs results in the engine stalling on the road. This can lead to many problems, so it is important, in time to find the cause of the engine RPM drop at idle and eliminate it. Well, if nothing helped and the engine stopped starting at all, then consider giving the car for rebuild: https://scrapcar.cash.
There are not many reasons for a drop in engine RPMs at idle, but each requires attention. It is worth remembering that a drop in engine RPM results in the engine stalling on the road. This can lead to many problems, so it is important, in time to find the cause of the engine RPM drop at idle and eliminate it.
Causes of the engine RPM drop
Often drivers simply do not understand why the engine stalls, and do not even try to find the cause, considering it the norm. This is the reason why drivers have to make major repairs to the car systems, including due to negligence towards the engine and its problems. Finding the cause of the engine speed drop is much easier than it seems. The main causes can include the following:
Poor-quality fuel. Some cars are designed for quality fuel, and when you pour other, the work of the engine can be disturbed. Such a situation can cause another malfunction, which will require an overhaul of the car and its systems;
Fuel level. If the fuel level is low, the engine speed may drop and sometimes the car simply will not start. Frequent driving on low fuel levels can lead to engine failure;
Spark plugs are one of the biggest causes of engine RPM drops in a car that is not often serviced. Even if the car’s spark plugs have recently been replaced, this problem cannot be ruled out. The car’s spark plugs may be of poor quality;
Breakdown of the idle speed sensor. At times, the usual contamination of it can lead to its improper operation, and, consequently, a drop in the engine revolutions at idle speed;
Air ingress into the carburetor. There are several reasons for this: a dirty filter, lack of air or, on the contrary, its excess;
Incorrectly tightened screws. Often the engine rpm drops at idle because of improperly tightened screws. Tightening can solve the problem, and normalize the engine rpm.
At the same time, it is possible to avoid idling engine RPM drop by timely diagnostics and maintenance of the car. Only attentive and careful attitude to the vehicle will allow detecting the problem with the engine in time.
How to restore revolutions at idling speed
It is possible to restore the engine revolutions at idling speed by performing several actions:
Perform the diagnostics of the thermo-anemometer. If necessary, replace it;
Clean the nozzle;
Restore the functions of air suction in the engine cylinders;
Clean the vent valve;
Remove rust from the high pressure fuel pump;
Adjust the exhaust modes;
Perform diagnosis of idle speed regulator. Replace it if necessary;
Replace carburetor valve;
Clean the throttle valve.
If the engine speed after that continues to drop, the engine stalls and problems are noticeable, you can undergo engine diagnostics and restore the operation of all units.
Idle speed sensor replacement
Often the engine rpm drops exactly at idle because of the malfunction of the idle speed sensor. It can be replaced at an auto service center or by yourself, following a few simple steps:
Disconnect the sensor wires and unscrew the screws;
Moisten a cotton swab in alcohol, then wipe all the contacts of the idle speed sensor with it;
Visually check the throttle for contamination. If necessary clean it with a cotton swab;
Inspect the cone needle, rod and springs for contamination. Clean also if necessary. ;
Put the idle speed sensor back in place, connect the wires, screw in the screws and check for proper operation.
The operation of the idle speed sensor can be affected by broken wires, wear of the stem or cone needle. In this case, only complete idle speed sensor replacement will help to restore engine idle speed.