Date: Sat, 25 Aug 2001 02:34:03 GMT From: dropdeadzonenopsamAMplease.yahoo.com (Karl R. Buschhaus, Esq.) Subject: Re: O2 sensor & black smoke?
Hey Dave, Long time no contact. How's the little one? (or two or three?) If you're not get a check engine light, I wouldn't suspect the O2 sensor. You can use the fault codes to find out. 12225 is bad 02 sensor. From what you are saying I'd suspect the ignition system or fuel system first. High load on the turbo means very high pressure in the cylinder which increases the dielectric qualities of the air fuel mixture making it harder for the spark to jump the gap. Also, the additional fuel demands of a high load can expose the restrictions in a mostly clogged fuel filter. If the stumbling feels like pre-ignition, this would tend towards inadequate fuel flow as the problem. I'd change the fuel filter long before I'd sink the cash into a new 02 sensor. Karl On 24 Aug 2001 12:19:17 -0500, dhinznopsamh.execpc.com (Dave Hinz) wrote: > >I've got what I think is a bad O2 sensor, but before I spend the >bucks, I'd like some opinions on if I'm on the right track please. > >Car: 1988 Saab 900 Turbo > 2.0 litre inline 4 > 220,000 miles or so (I'd have to check, maybe more like 230,000). > >Symptoms: Car sometimes "stumbles" while driving, usually under high-load >conditions. > >- Doesn't seem to happen when the car is cold, only when I've been drivng > a while >- I can see black smoke from the tailpipe while it's doing it > >My O2 sensor has never been changed. I'm inclined to think that this >would be the culprit, but can anyone think of other logical things to >check? > >Thanks, >Dave Hinz >
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