O2sensor code came up replaced all 4 runs fine.

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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

KHLOW2008

MECHANIC
41,814 POSTS

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

DEBBIESHAFFER-HEATHERMAN

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All o2 sensors were cleared
checked plugs and wires they were fine

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Thursday, November 22nd, 2012 AT 5:15 PM

KHLOW2008

MECHANIC
41,814 POSTS

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

DEBBIESHAFFER-HEATHERMAN

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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

KHLOW2008

MECHANIC
41,814 POSTS

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.