O2sensor code came up replaced all 4 runs fine.

Tiny
ANONYMOUS
  • MEMBER
  • 1997 NISSAN PATHFINDER
  • 143,000 MILES
O2sensor code came up replaced all 4 runs fine when cold then starts jerking and bucking idle goes up and down only car I have need help
Thursday, November 22nd, 2012 AT 2:41 PM

7 Replies

Tiny
KHLOW2008
  • EXPERT
What were the trouble codes? Are the codes still present after replacement of O2 sensors?
Did you check the spark plugs and related components?
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Thursday, November 22nd, 2012 AT 2:53 PM
Tiny
DEBBIESHAFFER-HEATHERMAN
  • MEMBER
All o2 sensors were cleared
checked plugs and wires they were fine
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Thursday, November 22nd, 2012 AT 5:15 PM
Tiny
KHLOW2008
  • EXPERT
Do you have coolant losses issues or overheating issues?
What is the idling speed at operating temperature?
Try cleaning the throttle body and IAC and see if the idling stabilises.
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Thursday, November 22nd, 2012 AT 5:57 PM
Tiny
DEBBIESHAFFER-HEATHERMAN
  • MEMBER
No loss of coolant and no overheating issues
Idling speed 75-80 thousand rpms
What is an IAC?
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Thursday, November 22nd, 2012 AT 6:00 PM
Tiny
KHLOW2008
  • EXPERT
Idle Air Control Valve. Idling speed is correct. So shouldn't be a fult with the idle control.

Misfiring should be the cause and were the spark plug wires ohmed out? Have the injectors checked and if possible, use a scan tooll to monitor the Throttle Position Sensor, MAF and injectors.
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Thursday, November 22nd, 2012 AT 6:50 PM
Tiny
DEBBIESHAFFER-HEATHERMAN
  • MEMBER
Rpm gauge goes up and down when vehicle warms up
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Friday, November 23rd, 2012 AT 1:23 PM
Tiny
KHLOW2008
  • EXPERT
Maybe the IAC is not responding as required. Try cleaning it.
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Friday, November 23rd, 2012 AT 1:27 PM

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