I have a Toyota Corona and it's been driving great even if it's really old. However, the other day, the engine started having problems — it will not idle. It also cuts off if I press the accelerator. I checked the plugs, air filters and gas filters; they are all okay. What should I do?

The most likely culprit in your problem is the idle fuel cut solenoid; it's either damaged or clogged. The cut solenoid valve opens and closes the fuel passage leading to the suction part. When it is turned on, the battery voltage is applied to the solenoid and the valve should compress the spring to be drawn upward; this result to the suction port opening and supplying the fuel. On the other hand, when the cut solenoid is off, the current that flows into the solenoid is cut off so the valve could retract downward and stop the fuel supply to the cylinder — the engine then will stop. Make sure to check all the fuses and locate the connector that goes into the harness for the carburetor. Check the power to the solenoid. If everything is fine then you may be having a vacuum leak. You need to check the manifold area if that is the case.

My Toyota Corona starts fine and runs without problem so I'm really very happy with it. However, it's been giving me headaches lately. The other day, it started to misfire after driving for about 15 miles. I checked the spark plugs and points — they are both okay. What could be causing this?

If the engine is running fine when it is cold and the misfires started as it warms up, the most likely problem would be a vacuum leak. When your car's engine is cold, the choke plate is closed which causes the engine to run rich. The choke plate opens as the engine warms up and if there is a vacuum leak, the mixture will be too lean. You should check for leaks at the base of the carburetor and around the car's intake manifold. You also need to check the EGR valve as it could stick open and cause the engine to misfire when it is warm. Your car's Check Engine Light would also come on if there is any leak in your engine.

The dashboard warning light in my Corona has turned on saying I have issues with the fuel filter. However, the filter in my car is new; I have just replaced it last week. I checked all the electrical connections and they are all fine. The light remains on, though. What should I do?

If you've just changed the filter, the first thing that you should do is to disconnect the negative cable from the battery and leave it for at least 10 seconds. This will allow the system to reset itself and if everything is fine, the light should go off. If upon reconnecting the battery, the light is still on, there is probably some problem with your fuel filter. A fuel filter warning light that stays on could mean that water has been detected. This means that the amount of accumulated water in the filter has reached a critical level. It would be normally safe to drive but the water should be drained off as soon as you can. The water could contaminate the fuel and cause damage to the injection system.

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