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Old February 15th, 2008, 06:36
indy_xj indy_xj is offline
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Join Date: Mar 2007
Location: indy
Posts: 28
0331 head swap, mpg change?

2000 XJ
54,xxx miles

I swapped my cracked 0331 head for a '98 630 and an 'aftermarket' header. The one with the acordian expansion chambers.

That was about 1100 miles ago. Since then, my milage has gone down the drain. I used to average about 17.5 mpg and 230-240 miles / tank.

Now I am getting about 13.5 mpg, and my last tank was a tiny 180 miles.

Its mostly city driving, but it was before the change also. No check engine lights or codes since the swap.

Anyone else have similar experiences, results?


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