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Old 11-12-2012, 09:09 AM
foaxaca foaxaca is offline
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Location: Rancho Cucamonga, CA
Join Date: May 2009
Posts: 21
Mein Auto: 1996 328is

Here is the O2 sensor I purchased:

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!
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