This is just a theory...
Your spark box/wires/plugs helps to burn the mixture BETTER. so there's less
oxygen left for the O2 sensors. Computer thinks less oxygen content in the
exhaust which means it's too lean and it enriches the mixture by opening the
injectors more. Therefore you're using more gas.
Far fetched? The mysteries of OBD-II.
Alan
'98 Dakota R/T (JBA shorties, Big K&N;TB & shiftkit soon)
'89 Mustang GT (347, Griggs GR-40 , Vortech S-trim...)
-----Original Message-----
From: Dennis Pendleton
[mailto:Dennis.Pendleton@harrisgrp.com]
Sent: Wednesday, January 27, 1999 2:37 PM
To: dakota-truck@buffnet.net
Subject: DML: MSD 6A - Mileage
I just installed a MSD 6A ignition on my '97 Sport 3.9L and
my mileage went from
~20 to ~16 mpg's! I thought these things were supposed to
increase your mileage
not take it away. Acceleration is much smoother and it
seems to have improved
my power but...
I have run 2 tanks of gas thru since the install and kept my
foot out of it on
the second tank thinking it was my driving but the mileage
seems the same
regardless. I also installed Magnecore's and Platinum 4+'s
along with the
ignition but they wouldn't have any thing to do with the
mileage decrease.
Anyone seen the same thing?
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