Aerostar starting idle problem
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Joined: Jul 2002
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From: kitch
Aerostar starting idle problem
When starting a 94 aerostar, we are having a problem. When the outside temp is below about 65, the idle fluctuates on startup. It revs high low high low high low and continues for about two minutes until it steadies. When it is warmer out, this does not occur.
Can anyone shed some light on this? I understand it is not that uncommon. I would apreciate help from anyone who has solved this problem. It used to happen all the time, but a new fuel filter two months ago seemed to fix the problem until the weather started to get cooler this past week.
Any ideas?
Can anyone shed some light on this? I understand it is not that uncommon. I would apreciate help from anyone who has solved this problem. It used to happen all the time, but a new fuel filter two months ago seemed to fix the problem until the weather started to get cooler this past week.
Any ideas?
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Joined: Apr 2001
Posts: 3,818
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Aerostar starting idle problem
First, the obvious; check the radiator fluid level and top up if necessary. The engine temp sensor sits at the top of the engine. A slightly low fluid level allows the tip of the sensor to be out of contact with the fluid. As the system warms and the fluid expands to touch the sensor tip you can often get a surging/galloping idle.
Second, pull the mass air flow (MAF) meter, located just after the air cleaner box on the tunnel to the throttle body. Remove carefully as this is delicate and spray the fine wires with an aerosol electronics cleaner. A dirty MAF meter will give a galloping idle as you describe. If this doesn't solve the problem, post back.
Second, pull the mass air flow (MAF) meter, located just after the air cleaner box on the tunnel to the throttle body. Remove carefully as this is delicate and spray the fine wires with an aerosol electronics cleaner. A dirty MAF meter will give a galloping idle as you describe. If this doesn't solve the problem, post back.
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Junior User
Joined: Jul 2002
Posts: 79
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From: kitch
Aerostar starting idle problem
Is the aerostar overflow bottle under pressure? My girlfriend says that she recalls that it may have been leaking. I know that my cherokee overflow bottle is not pressurized, but I don't see an overflow spout on this one and am thinking about doing a repair. If the bottle is a pressure bottle, I will repair it differently than if it is not.
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