98 s70 t5 hiccup

[318mike]

I can make it hiccup now by idling in one position for more than 2 or 3 minutes while I'm in park or drive seems to make no difference.The idle will drop abruptly about 200 rpms and just as quick it returns to normal(really annoying).When I bought the car(5 weeks ago)it had a check engine light that indicated the front 02 sensor was faulty.The car had been sitting for a couple of months so I cleared the code and it never came back is it possible that the sensor is gone even though the CEL never came back on.

[m96ag]

Have you checked the idle air control valve and hoses? Try cleaning the valve and replacing any cracking hoses. There are two rubber hoses; the valve itself is located near the throttle body. The sensor could, in fact, be bad and not trigger the check engine light.

[318mike]

I think I'll change the O2 sensor and I'll check the IAC and post the results....thanx