severe mpg drop - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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severe mpg drop
Posted by lan [Email] (more from lan) on Fri, 20 Jul 2001 23:18:31
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Recently my 94 900 set took a major drop (especially in low speed around town driving.) I've always averaged in the 29 to 30 mpg range, (do a lot of hi-way) but in recent months, this has started to creep down (a month ago, it dropped to 28 mpg.) In the last week, with the regular hiway commute it's down to 24.8 to 25-- unheard of in my experience. The 2 ltr suddenly sounds and feels rough. It has over 200k miles on it, but has always run primo. Replaced the NGK's, and the DIC only has about 30k on it. What I have noticed though is that my sid shows 30mpg+ at sustained hiway speeds, but as soon as I get on slower roads, with even the least amount of stop/go, the mileage zooms down, and never recovers. Could this be an O2 sensor gone bad??
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