Winter gas vs summer gas

[Eric Aos]

I have to re-jet my pickup every time they change gas here in Oregon. This
year wasn't as bad as the last ones though.
Eric

>
> 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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