Question about 2004 Ford Freestar
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Posted on Jan 02, 2017
i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.
Posted on Nov 15, 2008
I'm assuming all of the brake lights are on? If so there is a brake light switch located way up under the dash that hits on the arm for your brake pedal. If this is not "closed" when the pedal is up (not depressed), your brake lights will stay on. It is adjustable.
Posted on Jul 29, 2009
Sounds to me like a very common problem has occured to your neighbor. If this is a SOHC engine, one of the valve seats in the number 4 cylinder has fallen out. I'm sure it has damaged the head and the piston. Stop trying to run it or you might blow a hole in the cylinder wall or break a rod or both.
Posted on Aug 07, 2009
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