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foaxaca · #14 11-12-2012, 09:09 AM

Here is the O2 sensor I purchased: http://www.fcpeuro.com/products/bmw-...lker-250-24810

I reinstalled the old plugs and started the car up again. It idled a bit rough for a bit, smoothed out and then started to idle rough again. Idle RPM's about 25% lower than normal. No check engine light at any time. Could this be the SeaFoam causing this or am I looking at another set of O2 sensors? The car had no issues before other than not passing smog check. I've already combed for vacuum leaks recently and found a couple along with replacing a CCV hose that was cracked. Car has been running fine since.

Things seem to be getting worse instead of better!