1992 Ford Aerostar Other - Fuel System

Question: Idle osilates during cold start only. Must keep foot on gas until warm. What is the diagnostic procedure and what sensors are used for cold start only for combustion control/emissions.

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Technican: Does the check engine light come on when the engine is running? Have you tried removing the idle control valve and cleaning the valve and it's passageway.

Owner: The engine light does not come on, but is working. The idle control valve was open and fairly clean and the ports were open in the manifold. I checked this first.

Technican: Try unplugging the TPS (throttle position sensor) when cold. Start engine but don't touch the gas, is problem better? If the engine computer is not being told the proper temperature from the coolant or intake temp sensors it will not get the rich fuel mix needed to run a cold engine. Test the sensors and let me know. THere are free instructions available online if you don't have a repair manual. Let me know.

Owner: can you send the link for the free instruction on temperature sensor testing? thanks.

Technican: Cut and paste the following link into your address bar. autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/14/aa/20/0900823d8014aa20.jsp Let me know if the link works for you, if it does not I can send you a direct link if you leave your email address. Also notice the repair guide covers a wide range of years and there will be some repair information that does not apply to your '92.

Owner: no problem with the link, thanks. unplugging the TPS had no affect. temp. switch is ok. bypass air valve has 12 volts warm instead of 1 volt. is it 1 volt cold, or does it matter. still had 12 volts at normal temp. plugging it in did not change the idle speed. applying 12 volts fried my small wire jumper. no idle change. does this valve modulate, or just full open & closed? seems as though the voltage is incorrect or the valve is bad, or both. what do you think? thanks.

Technican: With the air valve unplugged do you still have the idle problem? When vehicle is warm does the idle change if you turn on the A/C or turn the steering wheel- what we are looking for is the idle speed to raise slightly to support the extra load. The valve moves in an attempt to constantly maintain desirable idle speed.

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