Idle, RPMS all over the place. (total overview)

[jetjock13]

Hey all, need you help. (still),

I have put up a few posts and at the urging of a few, I will give the total overview of whats going on and what I have done in an effort to give the most information in the hopes a resolution can be reached with this car.

The Issue: 1997 328is - 220,000 miles.

I have had a problem with the car having a very rough idle at start. Smooth idle above 1300 rpm.
As the car warms up, the idle becomes smoother, but still bounces between 800 rpm to as low as 300 rpm.
On several ocasions, I have noticed that with the car stopped, and without touching the throttle, the rpm's will climb above the 1000 rpm mark and has gone as hi as 2000 rpm. After a few seconds, it returns to 800 rpm.
Also, I notice that when I press in the clutch to shift, the rpm's climb before returning to normal.

Here is what I have done to fix the issue so far.

I have checked for any vac leaks, replaced the airfilter, MAS, The rubber boot behind it, cleaned the ICV, checked for poor connections and changed the fuel filter.

I have gotten the code p/1188 - p/1189 from the ODC II.

Any thoughts ?

Thanks.

[bimmerman318]

I have OBD-II Trouble codes book and thats whats came up.

P1188 - Fuel Control (Bank 1 Sensor 1)
P1189 - Fuel Control (Bank 2 Sensor 1)

[jetjock13]

Hey bimmerman318, Same thing my reaserch found. Any Idea what could be causing this?

[bimmerman318]

dont know but since its a fuel problem i would say maybe injectors are getting bad or fuel pump.:dunno i recomend going to a local mechanic and having him check it out.

[Euro SC]

I still think you may have a vacuum leak. I would recommend that you have a shop do a smoke test. This can find vacuum leaks that you would never find with carb clean. After that I would be looking at the data coming from the MAF sensor.

Something to else to check would be the feuel pressure regulator. Pull the vacuum line from it and see if it is wet with fuel.