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Winterizing and "Winter" Gasolines

1896 Views 10 Replies 6 Participants Last post by  oddsox
Can anybody help me with a problem I'm having. My 1999 750 has developed a REALLY TERRIBLE sputtering and hesistation problem. It wont stay running at stops and at low RPM's it sputters like crazy. I was using 85 Octane all summer and have a feeling that the MTBE they use in Colorado gasoline during wintertime might be a cause. I replace the stock Champion plugs with NGK's and about 2 weeks later---BAM, hell broke loose. I've cleaned them many times and a spark test shows plenty of fire. I've tried bumping up fuel grade, but to no avail. I've drained the tank completely. Went back to go back to 85 octane. Ran great for 2 days!!!! Then I filled up with the premium, and the bull&^%$ happened again.

Need some help--Also what is recommended for winterizing the Ducks???

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I've had similar problems with my wife's M750 but never with my S4. Fouled plugs, running on one cylinder, one failed plug. Don't know what the solution is though so if you find out share the knowledge. I'm also in Denver and it's not icing, happens in the summer too. Ihave found that NOT using the choke helps.
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