Quote:
Originally Posted by Diazo66
I just did a swap from a CX to a VX. I'm not getting the mileage I thought, I'm at about 40mpg highway.
Any sugestions as to why the mileage is so low? anyone?
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I don't accept < 42 mpg hwy as even close to normal for a properly running Fed VX. I'm in the same boat and interested in how this sorts out. My VX has never delivered better than ~41.xx mpg. I believe there is a major malfunction of some kind that prevents the car from getting the additional 25% higher (10 mpg) that these engines are capable of for highway use, expecting ~50 mpg +
My VX is a CA version with a Fed ECU swap, it came with the 5-wire sensor as all the 1992's did. I am second owner who purchased the car in August with 215,200miles on a well maintained engine.
Been there, done that: correct plugs, air filter, rotor, distributor, good clutch, correct tranny, high tire pressure, and good maintenance practice, my VX is perfectly up-to-date on those obvious things that both our cars (and many other's here) have properly handled.
Yet I really think there is a short list of silver bullet items that force the VX to the low 40 mpg number and this is the sign of something seriously out of wack in the engine management area. I am guessing that the short list would look something like this,
*LAF sensor,
*electronic air control valve (EACV),
*intake manifold clogged by EGR carbon choking off intake swirl effect at low rpm.
That's my guess on a short list, though I'm interested in other none maintenance, system related issues that someone before us have found. Did anyone take a VX from low 40's to low 50's in one swoop?
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