Winter gas vs summer gas

[944 at technologist.com]

> problems with "winter" gas?

That is normal. I am not sure what rules they are running these days but you
could count on about 2% fewer BTUs of heat energy in the winter and the
knocking in warm LA, CA. Cold fuel in the snow must ignite and there are few
choices on how to do that. Hence, the trade-off. Some people notice the
knocking. Just go up a grade for a few months.

FR Wilk
___________________________________________________


> Has anyone here experienced problems with "winter" gas?  Especially the
> oxygenated, reformulated, winter gas sold in California in (I think)
> November, December, and January?
>
> The previous two winters, the winter gas caused two of my vehicles to
> occasionally ping under mild throttle conditions.  Each year, by the
> time the weather warmed up enough (February) to consider diagnosing the
> pinging, the problem went away.  One vehicle is PFI and the other has a
> computer-carb.  A neighbor reported similar problems with a TBI engine.
>
> This winter, I didn't have the pinging.  Instead, the carb vehicle liked
> to stall when the engine was cool.  The engine acted/sounded like it
> went totally pig rich, the rpms dropped, it started rich misfiring, and
> eventually stalled.  I replaced a few "iffy" parts, but couldn't fully
> solve the problem.  I've been driving around for several weeks with a
> DVM hooked to the O2 sensor.  The DVM showed that the cool engine wasn't
> nearly as rich as it sometimes got when fully warmed up.
>
> A few days ago, I filled up with gas for the first time since January.
> (30 gallon gas tank...)  Problem solved.  Hrmph!
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
>
>
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