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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