Question about 1998 Ford F150 Regular Cab

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F150 won't start

1998 F150 4.2, V6 engine. 100k+ miles; Unable to start--after tuneup, oilchange, fuel filter and PCV valve change and replaced battery. It sounds like it wants to turnover but doesn't. No visible leaks in fuel lines.

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Sounds like the dreaded 'hydrolic lock' that is a common problem with the v6, caused by a leaking head or intake man. gasket. Check coolant level - if down, it's sucking fluid.

Posted on Aug 28, 2008

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Crank or cam sensor

Posted on Aug 17, 2008

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Have the coil pack checked.

Posted on Jun 29, 2008

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1 Answer

Code 171 error ford expedition 1998

There are a multitude of things that could result in a PO171 trouble code.
It might be the infamous PCV elbow problem.. Around 100K miles 5.4's are bad to rot out the PCV elbow on the back of the throttle body, this will cause bad idling problems and will throw lean codes when it gets really bad.
Find the PCV valve in the passengers side valve cover and trace the tube around to the back of the throttle body. With the engine running feel around the rubber elbow and see if you have a vacuum leak.

Here are some other things to try:
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