1989 Ford Aerostar Malfunction - Engine

Question: Engine idle sometimes goes up and down when in gear and brakes are applied. Engine does not backfire or hessitate when the van is moving. There is no black or white smoke coming out the exhaust. Engine does not stall. Idle does not go up or down when transmission is in park. Engine trouble light does not turn on until i make a turn, then the engine trouble light comes on. This change in idle speed happens about twice a day. Engine trouble light turns on after about 10 minutes of driving, and it turns on after making a turn? There is a small coolant leak in one of the radiator hoses, but i keep the coolant level at the correct level. The van does not overheat even when it is used in traffic for about 40 minutes. The van has no problems with accelerating or decelerating or bad fuel economy. Van has no problems in starting up cold every morning, it always starts on the firt try. Van has also passed the arizona emissions inspections. Is there a possibility of a sensor going bad which causes the idle to sometimes vary? If so, which one is going bad. The engine trouble light coming on with no change in the vans performance is strange. Engine light does not come on when the idle varies. Seems to be two separate items going on with the van. Idle varies but engine light does not turn on and engine light turns on and idle does not vary?

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Technican: Hello, Have you had this van checked to see what drivability codes are being set when the engine trouble light comes on? A scanner/code reader can find current and history codes in the computer's memory and provide direction for repair. Often a national auto parts chain store will "read" the codes for you at no charge. Give them a call. The idle speed control motor may be sticking or the throttle body bore might be in need of cleaning. I would look at the mass airflow sensor and the air filter for cleanliness, too. A public library is a great source for reference material.

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