Cam sensor advances my timing at an idle on the nissan altima 2.5

SOURCE: Rough idle

I took mine in to change the plugs and they said there are four O2 sensors in the fuel mixture system and two were bad. I didn't replace them since they were a little pricey ($500 to replace both) and I have 103,000 on the car. Has very similar roughness and occasional oscillations, but no stalling. Hope this helps.

SOURCE: fuel system

Check the fuel system, chenge fuel filter. clean the fuel tank.

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Marvin

• 85242 Answers
• Posted on Feb 18, 2009

SOURCE: ROugh idle

there are 2 things that usually cause this, one is a dirty intake idle control valve and the other is hard engine mounts, I would say that both most likely apply to your car. try cleaning the intake with the following procedure from Ford.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

mike loshbough

• 1011 Answers
• Posted on Feb 22, 2009

SOURCE: I have a 83' lincoln Mark 6 with a 302 V8 and a 2

put a throttle position sensor on the throttle boby this should fix the problem!