Strange behavior but no code, should I worry?

[wawa]

Well it happen again tonight but something new happen too. Idle start moving by itself. It goes slow from 1k to 2k than jump down to 1k. When I arrive at home entering the garage I realized that there is a belt or bearing noise coming from engine. Could it be a bad alternator?

No cel light again but I will look again for any pending code tonight

Later
Wawa

[Meir]

Originally Posted by wawa

Well it happen again tonight but something new happen too. Idle start moving by itself. It goes slow from 1k to 2k than jump down to 1k. When I arrive at home entering the garage I realized that there is a belt or bearing noise coming from engine. Could it be a bad alternator?

No cel light again but I will look again for any pending code tonight

Later
Wawa

Remove the belt and spin each element by hand.

[wawa]

Well no CEL but there is 2 pending code on my code reader.

P0507 - Idle Air Control - Idle Speed Too High (that match the idle going up to 2k than jump down at 1k)

P1126 - Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Rich Threshold

What could cause that with all other symptoms?

Later
wawa

[wawa]

Well I losen the belt and all elements seam to turn freely without noise. I also start again the engin and no noise so I dont think the noise was releated to my problem. But when i started the car it did a good smoke clould kinda blue. I'm really starting to think about a fuel problem.

later
wawa