A leak? I had a small < 1mm or 1/16" hole in my exhaust where it was welded. That itty bitty hole caused mr computer to get really pissed.
David Henry '94 CC 4x4 318 5Spd in MI
> Date: Thu, 25 Feb 1999 18:22:26 -0600
> From: James Thomas <callisto@flash.net>
> Subject: DML: Re-post Mileage Drop
>
> Com'mon folks, I only got three responses to this post the first time.
> There must be more folks than that out there that have some ideas or
> suggestions on how to get my economy back. Has everybody else gotten
> better performance and economy out of their exhaust work? One last time:
>
> Am resending this message as I did not receive an answer as of yet and
> did not know if it had been received. Have done the following to a 1994
> Std Cab 4X4, 5.2L, auto, 3.55 gears. Started with a Transgo shift kit
> then added Magnecor wires, brass cap and rotor, Champion truck plugs,
> MPI Super Street throttle body, K&N FIPK, Mopar Performance SBEC,
> DynoMax cat-back (2 3/4in pipe), hi-flo catalytic and new O2 sensor. All
> upgrades done within the last month or so. Everything up to the exhaust
> work gained very significant torque and throttle response and 3-5mpg
> city/highway. The gas mileage increase with the performance gains was
> just what I wanted. When the exhaust work was done I lost the mpg gains
> and then some. I went from getting 16.5 combined city/highway down to as
> low as 14.2. On strictly highway mileage I went from 20.1(best) to 15mpg
> at best now. I gained some nice breathability with the
> exhaust albeit at a high expense of economy. Has anyone else ever run
> into similar mpg problems with a combination like mine? Am wanting to
> add an MSD ignition control box and coil soon but would like to get mpg
> problems identified first. Any ideas why the exhaust work caused the
> mileage to go down?
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