I've changed 3 O2 sensors in two years along with a new cat. I've been
getting a little better milage (+ .5) with the MSD than stock.
Geoff
"Doug Fedeli" <rdf@eznet.net> wrote in message
news:3AF56E7C.B82C20E3@eznet.net...
> I don't know if this will help or hurt MPG but with the MSD ignition you
need to
> get rid of the platinum plugs and get a set of copper core plugs. MSD says
in
> the instruction to not use platinum plugs. I have a 92 V6 CC with the MSD
6A,
> Accel coil, MSD 8.5mm wires and Autolite 3923 plugs and I get 17 mpg
running
> around town. I get 17-18 mpg on a trip. (2500 lb popup camper and a bed
loaded
> with gear and toys for the kids) The last time I took a trip with the
truck with
> no camper I got 24 mpg. How old is your O2 sensor?
>
> Doug Fedeli
>
> Geoff wrote:
>
> > Hey all,
> > I've been trying to figure out why I get 12 mpg with my 95 3.9L 6
> > standard cab, short bed, Auto tranny but it's to no avail. I'm not
getting
> > any DTCs and I didn't find any TSBs for this problem. I've checked the
MAP
> > sensor and people say my reading was okay, but I thought it seemed a
little
> > high. I have a TFX split rear exhaust system, a MSD 6A ignition, and
JBA
> > headers on the way. None of these should hurt gas milage so that can't
> > explain anything. I've been getting 12 as long as I've had the truck
but I
> > have friends with the same truck (except manual trannys) that are
> > consistently getting 20 mpg. What else can I try? Oh yeah, I also
> > installed new spark plugs (Bosch 3x platinum) wires, cap and rotor.
> >
> > Are there any web sites that address these problems, or what have you
guys
> > done?
> > Thanks, Geoff Fahl geoff_fahl_1@yahoo.com
>
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