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Discussion Starter #1
i hav a d15z4 engine, to me it has always been giving me bad mileage. i did a swap last week putting a zc intake manifold on my car, sounds much more agressive yes, but started giving much worse mileage plus check engine light. i had it fixed, it was the tps. now the engine feels a little better an is running smoother and all but its jus consuming too much gas, i drive extremly slow because i need the gas to last longer but its still burning bad that i dont even floor it. what do i do? i really need ya'll help
 

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You might have missed something when you swapped the intake or left soemthing disconnected.
 

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Discussion Starter #5
december was ma last tune up. everything is connected i'm sure. my rev screw is turned all the way down tho, trottles really nice an smooth around 900 just below the 1 gran rev meter.
 

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d15z4
that sounds like the economy motor with the small 42mm intake/throttlebody
if you put a zc manifold on that its oversized and produced a "stepped" port into the head
correct me if i am wrong about your motor
but you should go back to the stock manifold
i have the american d15z1 and i get 50mpg or 21.257 km/L
 
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