Date: Fri, 24 Aug 2001 21:18:10 -0700 From: Johannes H Andersen <johannes.andersennopsamel.ac.uk> Subject: Re: O2 sensor & black smoke?
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 Hm. Headgasket, plug connections to various sensors, the turbo. In order of likelihood. I think the O2 sensor can be checked by an Ohm meter if you know what the default (cold) resistance should be. Johannes