Losing Idle And Running Rich

[milli86]

hi guys recently i just ventured in a turbo change over from a stock rb20det turbo to a vg30 turbo. The vg blew so i put on my stock turbo again but ever since then its been slowly gettin worse. like it runs like a pig when its cold and once warm when idling at the lights or runnin it on the turbo timer she fluctuates between 500rpm and 0rpm and then finally gets to low and stalls it dosnt happen all the time but its gettin more fluent and is startin to get me a lil worried. other thing is when i put my foot down flat to the floor she just so dowey and all of a sudden bam hits me real hardcore still around 3000rpm but before that its nothin and find she is runnin really really rich. I was wondering if anyone could give me some suggestions on this matter on what it might be thanks for your time

mark

[SpeedyJ]

Make sure the turbo and manifold bolts are all done up to torque. Did you use new gaskets? If that isn't the problem, then don't drive the car under boost until you've identified the problem as engine damage only takes a 10th of a second if the engine leans out. I recommend taking the car to a reputable workshop, one that has good experience with Skylines.

[BH_SLO32]

The symptoms you describe point to the O2 sensor. Next time the idle drops disconnect the O2 sensor and see if the idle stabilises.

Hope this helps.

Cheers