Mechanics

NISSAN PATHFINDER SENSOR PROBLEM

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
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Guest
November 22, 2012.



What were the trouble codes? Are the codes still present after replacement of O2 sensors?
Did you check the spark plugs and related components?

KHLow2008
Nov 22, 2012.
All o2 sensors were cleared
checked plugs and wires they were fine

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.

KHLow2008
Nov 22, 2012.
No loss of coolant and no overheating issues
Idling speed 75-80 thousand rpms
What is an IAC?

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.

KHLow2008
Nov 22, 2012.
Rpm gauge goes up and down when vehicle warms up

Maybe the IAC is not responding as required. Try cleaning it.

KHLow2008
Nov 23, 2012.