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2002 expedition stalls and has P0171 and P0174 codes

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Old 12-07-2017, 02:24 PM
Stacy Lynn Stacy Lynn is offline
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2002 expedition stalls and has P0171 and P0174 codes

My check engine soon light is on with error codes P0171 and P0174 (left side is what they told me). It now stalls or dies at stop signs, lights or pulling into parking spaces if I don't keep gas pumping to it. It's much much worse on days below 40 degrees. Has anyone had the same problems or have any ideas on simple fixes without taking it to a shop?
Thank you
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Old 12-07-2017, 02:40 PM
pdqford pdqford is offline
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Yep. Find the vacuum leak.
Typically in the PVC system.

OTOH, could be a dirty MAF,
or fuel supply issue.

Look at the Freeze Fram data to see
when the fault occurred. If it happened
under light throttle, look for vacuum leak.
If it occurred under heavy throttle look
for fuel supply issues.

Since you are having idle (light throttle) problem,
My money is on the vacuum issue.
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Old 12-07-2017, 03:02 PM
Stacy Lynn Stacy Lynn is offline
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Thank you! I will start there!
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Old 12-07-2017, 08:27 PM
Hamfisted Hamfisted is offline
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A vacuum leak big enough to cause a stall should be pretty easy to spot. Take a spray can of carb cleaner and spray around suspected hoses and you should be able to hear a change in the engine. Especially that big vacuum pipe at the rear of the intake manifold. The rubber elbow on that thing is notorious for cracking. Dorman makes a replacement for that piece. The other little elbows and vacuum hoses all seem to rot out in time. You can find the complete PCV vacuum tree, which includes that rear elbow, on Amazon for about $65 if you end up needing the whole line. You can find most any of those pieces on Amazon if you know the part number.


-Mike


https://www.amazon.com/Ford+2L3Z+6C324+AA https://www.amazon.com/Ford+2L3Z+6C324+AA

Vacuum Elbow by itself ... Vacuum Elbow by itself ...
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Old 12-08-2017, 02:10 PM
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lv2race lv2race is offline
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Take a look at your PCV hose on top of the passenger side valve cover and follow it around to the back of the intake to verify which one you have. See below........

https://www.rockauto.com/en/moreinfo...385333&jsn=451

You can also find a Dorman one for cheaper. I got a Motorcraft from my local dealer for $36.
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