Mechanics

FORD F-150 SENSOR PROBLEM

2001 Ford F-150 • 220,240 miles

I have a rough idle, it fluctuates between 600 and 1000 rpm. It only does this when the outside temperature is below 70 degrees. I have replaced the dpfe sensor, cleaned the mass air flow sensor, replaced o then sensors and still have this problem. It codes a P0174.
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Guest
November 15, 2012.




Did you check or replace the coolant temp sensor? If not and you have a digital volt ohm meter we can check it to see if it is bad.


Racefan966
Nov 15, 2012.
No I did not check the coolant temp sensor and yes I do have a digital volt meter.


Tiny
Nhemphill
Nov 19, 2012.
Ok if you would when the engine is cold unplug and ohm the coolant sensor then also ohm the air charge temp sensor. Get back to me with the readings and the air temp too.
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Racefan966
Nov 20, 2012.
Not to sound in educated, but where would the coolant temp sensor and air temp sensor be located? I have a pretty good idea but want to be sure. The coolant temp sensor is right beside where the upper radiator hose goes into the watt pump and air temp is located after the mass air flow in the intake system?


Tiny
Nhemphill
Nov 20, 2012.
Which engine do you have?


Racefan966
Nov 20, 2012.
5.4 L


Tiny
Nhemphill
Nov 20, 2012.
Here is a pic of sensor locations.


Racefan966
Nov 21, 2012.

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