Curing running on is a task that will require you to go through multiple possibilities and troubleshoot various problems before you deduce the actual issue. One such troubleshooting task includes performing an ignition check where you’ll have to check the ignition’s timing, look out for leaking hoses, and ensure the fuel and air mixture is in the right setting. Therefore, we have curated a detailed guide for you that won’t just walk you through all the possibilities causing running on but will also teach you the various ways through which you fix such issues.
What is Running on?
Engine running on is a phenomenon when the car’s engine keeps working even after the ignition has been switched off. An engine running on often happens due to the combustion chamber’s ignition of fuel or air mixture.
During an engine running on the air mixture and fuel fire at the incorrect points in the engine cycle. This makes the engine rock, backfire, and jerk and prevents the car from running fast. Your car’s engine running on is a big red flag. If you continue to ignore it, it can severely damage the engine. You can try stalling the engine as a temporary fix by putting the gear on. However, this method will not help you in curing running on in the long run.
Curing Running on- Troubleshooting
Running on happens when your engine develops a hot spot. There are various reasons why this hot spot appears. Thus, a crucial aspect of curing running on includes troubleshooting for such reasons and fixing them.
Checking the spark plugs
Examine the sparkplugs by taking all of them out. Check the electrodes and the insulator’s nose for overheating. A normal plug is a light brown. If you notice the plug becoming glazed or white, that is a sign of overheating.
In case of old spark plugs, replace them. However, if the problem keeps on recurring, the plugs aren’t compatible with your car’s engine. Refer to your car’s manual or handbook in such instances.
Inspecting the ignition
Start by taking the spark plug out. Check the ignition’s timing using a timing light. Furthermore, check for leaks using a hose. Lastly, bring the air mixture and fuel to the accurate setting.
Checking the fuel system for air leaks.
Running on can also be caused by a faulty system. Poor carburetor adjustment causes a weak air mixture, or leaks in the manifold’s inlet can occur. Such instances can trigger overheating and thus running on.
To fix such issues, clean the air filter and fit it correctly. Ensure that none of the filters and the carburetors are disconnected or damaged. In addition, check the engine for sucking or hissing sounds. In case of a leak, check using a tube piece. Furthermore, you can also apply motor oil or engine oil to the joint and check If the oil disappears in the hole or not.
If no faults are detected in the manifold, move on to the carburetor. Start by tuning the carburetor until you get the accurate air mixture. Ensure the idling speed is medium, as a high idling speed can induce running on. However, if none of these techniques work, you need to replace the carburetor.
Anti-Dieseling valve check
To check the anti-dieseling valve, you must first remove the wire and carburetor’s side valve. Connect the valve’s live terminal to the positive terminal of the car’s battery. A click sound will be heard if the valve is completely fine while also retracting the rod.
Now, you need to check the anti-dieseling valve on the carburetor. You can locate this valve in your car with the help of your car dealer or manufacturer’s workshop manual. Remove the wire from the electrical system and unscrew the carburetor’s valve to test the valve.
Connect the valve’s terminal to the battery’s positive terminal. If the valve’s solenoid is not faulty, you’ll hear a click as the rod protrudes out and slides inwards. However, if this doesn’t happen, it’s a sign that the valve needs replacement. On the contrary, if the valve isn’t faulty, then the issue might be in the electrical system.
Air Bleed Valve
Usually, air bleed valves are placed on the car’s bodywork, and they join the inlet manifold via a hose. We can plumb this hose in any manifold or to the additional stub. In the case of a single stub, you can use a Y-adapter and connect the stub to the hose.
Note the hole positions after offering the inner wing to the bleed valve. Put a dent using a hammer to mark the hole’s position. Now, drill the holes out without damaging the panel.
Place the hose on the valve’s stub. Then, Screw the valve to the car and secure the hose using clips. Now take the valve to your preferred take-off point on the hose. If you’re joining it to the hose, use a T-shaped hose piece and secure it using clips.
However, if you’re joining it to an adapter, you’ll have to unplug the existing plug or adapter and place the new one. Now, connect the hose and stub using clips.
Lastly, take a wire and probe it on the bleed valve. Take the wire to the live feed controlled by the ignition by running it through the valve. Connect the wire and switch the ignition on. Observe the valve’s sound. You should be able to hear a click. Now, run the engine to see if you’ve been successful in curing running on.
Conclusion
If you’re still unable to detect the problem, the problem likely lies in the combustion chamber. In this case, unfortunately, you cannot do much without completely removing the cylinder head. You can also try decoking by removing the cylinder head and cleaning the combustion chambers. However, it’s advisable to consult your mechanic or a tuning specialist in such cases.
Curing running on is a maintenance skill that helps you sustain your car’s overall performance and make your car run faster. Other skills that can help you boost your vehicle’s health and performance include
