Check this out!
> Dear Sir,
>
> We do not recommend using platinum tip plugs with the MSD unit, we also
> recommend gaping the plugs to .050 to .055 to obtain maximum air/fuel
> mixture burn. The platinum plugs have a tendency to run hot and can cause
> detonation. If you have your old plugs or pick up a standard none hype
> plug one step colder and see if that helps. if the plug gets hot enough
> and starts causing some preignition and the computer picks that up it will
> retard the timing which can cause the poor mileage. Reset the computer and
> take the truck out and drive it normally. This will cause the computer to
> relearn with the MSD box in place and help over all. On the O2 Sensor, it
> is only affected when you are under a load condition or full acceleration,
> with light load or cruising it should not add anymore fuel, it is striving
> for 14.7:1 air fuel ratio.
> Thanks,
>
> MSD Tech
>
> ----------
> From: Bernd D. Ratsch[SMTP:]
> Sent: Wednesday, January 27, 1999 6:46 PM
> To: Joe LaPille
> Subject: Question...Problem
> Importance: High
>
> I'm part of a large Dodge Dakota Mailing LIst and we've been seeing
> different scenarios with the MSD 6A boxes. I was wondering if you could
> clear this up for us:
>
> Here's a copy of an email that's going around....
>
> MSD - OBD/II: Pro's & Con's
>
> Original Problem:
> "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?"
>
>
> Member Answers:
> (1) Are you supposed to run platinum plugs with MSD?
>
> (2) 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.
>
> (3) I hope you remembered to gap the plugs at .050. That makes a big
> difference.
>
> (4) Reset the computer
>
> I personally also run the 6470 w/8207 Coil, Splitfire Wires/Plugs (Gapped
> @
> .050") and haven't had anything but great success.
>
> Your help would be greatly appreciated...
>
> On behalf of the Dodge Dakota Mailing List - aka: DML
>
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