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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
AW4/NP231

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?


thanks,

ixj
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