How do I know if my crank position synchronizer is bad on my 2002 F-150 because its not idling correctly.

Tiny
FPIERCE
  • MEMBER
  • 2002 FORD F-150
  • 140,000 MILES
The engine light is on and the code came back with an 02 sensor I replaced it, didn't work. The reason why I think this is the issue is because a friend of mine was having the same issue with his truck and his mechanic replaced it. My friends truck runs fine now, so before I replace it I would like to know how to test it. It looks to be a pain to do. Thank you
Saturday, February 4th, 2012 AT 1:16 PM

4 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
What is the exact trouble code you are getting?
After replacement of the O2 sensor, is the trouble code the same?
Did you check the O2 sensor circuit?
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Saturday, February 4th, 2012 AT 2:42 PM
Tiny
FPIERCE
  • MEMBER
  • 1 POST
Ok I went to get the codes read here's what I got p1131 p1151 p0171 and p0174
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Saturday, February 4th, 2012 AT 5:18 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
P1131 O2 sensor not heating.
P1151 same as above
P0171 & P0174 lean mixture.

With all these codes I would be checking the air flow meter first.
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Sunday, February 5th, 2012 AT 12:56 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you test the O2 sensor circuit? When a sensor is replaced and it is not responding, it could be a open circuit instead of a faulty sensor.

Mhpautos is corrct about the MAF being a possible cause.
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Sunday, February 5th, 2012 AT 5:36 AM

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