bad gas mileage before and after tune-up - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kenversusryu · 03-30-2006, 06:26 PM

so ever since i installed a ram-air setup on my 95 240sx i went from 27mpg city/highway to 21.

I removed it and changed my spark plugs, fuel filter, o2 sensor, coolant change/flush, oil change, injector cleaner and I'm still getting bad gas mileage.

I guess i'll replace the distributor cap, rotor and maybe the coolant temperature sensor but what else could be causing this really bad gas mileage? should i check timing? The car runs good and no noticable problems at all. I ran a self diagnostic as well and came up 55 (no problems)

I am desperate for help. What else do i have to replace or check??

03-30-2006, 06:26 PM	#1
kenversusryu Zilvia Member Join Date: Sep 2005 Location: cali Posts: 259 Trader Rating: (0) Feedback Score: 0 reviews	bad gas mileage before and after tune-up so ever since i installed a ram-air setup on my 95 240sx i went from 27mpg city/highway to 21. I removed it and changed my spark plugs, fuel filter, o2 sensor, coolant change/flush, oil change, injector cleaner and I'm still getting bad gas mileage. I guess i'll replace the distributor cap, rotor and maybe the coolant temperature sensor but what else could be causing this really bad gas mileage? should i check timing? The car runs good and no noticable problems at all. I ran a self diagnostic as well and came up 55 (no problems) I am desperate for help. What else do i have to replace or check??