Gas?

[skylinedreams]

ok im kinda gettin sick of this i have a 90 240sx sohc k&n air filter, headers, highflow cat 2.5" exhaust. im tryin to figure out why my car is eating gas. i can barely get 200 miles to a tank full. im pretty sure this isnt normal. my ecu isnt putting out any codes so im pretty much confused. anyone got any ideas? i just recently changed my fuel filter, and plugs if that helps.

[[s3]]

Probably lead foot syndrome

[skylinedreams]

i was thinkin the same thing but its very rare if i rev my engine over 3 grand. I even purposly drove like a grand ma for a whole tank and still crappy gas mileage.

[[s3]]

Time for a tune-up, decarbonize your TB, check for oil leaks, check your filters, etc etc etc

[skylinedreams]

decarbonise tb? how do i do that or do i have to take my car somewhere to have it done? oh i forgot to mention my car has only 99000 miles on it. I just want to figure this out before i start to get my turbo parts.

[[s3]]

Throttle body cleaner @ Autozone

Turbo parts eh....good luck

[skylinedreams]

[QUOTE=

Turbo parts eh....good luck[/QUOTE]

why do you say that?

[[s3]]

If you have trouble figuring out what carbon deposits are....can't wait till you put in those turbo parts.

What "turbo parts" are you putting in?

why do you say that?

[skylinedreams]

not quite sure im still researching the turbo set up but im aiming to get 250 or 300hp. I basically wanna get my gas issue settled before i go buying anything else. I asked what decarbonizing was cuz ive never heard of TB cleaner refered to as that. What I want to know is how is it that carbon gets into the TB.

[[s3]]

not quite sure im still researching the turbo set up but im aiming to get 250 or 300hp. I basically wanna get my gas issue settled before i go buying anything else. I asked what decarbonizing was cuz ive never heard of TB cleaner refered to as that. What I want to know is how is it that carbon gets into the TB.

Carbon deposits are everywhere, inside your valves, cylinder walls, exhaust components. Wipe your fingers on the throttle body walls when you take the hose off, also wipe your throttle plate with a bounty towel...the black stuff.

Its also a byproducts of burning gas.

250 to 300HP on the SOHC is going to cost a few dollars.

[skylinedreams]

gotcha. I realize its not gonna be cheap thats why ill be buying the peices little by little i dont think ill be done until after this summer.

on an another note thanks for the info

[my89240sx]

might check your 02 sensors. They won't throw a code on the ecu unless they completely stop working, in the meantime they may have built of crap on them that is causing a false reading to your ecu.

[2s4x0]

I get 380 miles on a full tank. Never ran it completely out but my guess is i only had maybe 5 miles left if that. Been running with fuel light on for 20 miles or so.

[skylinedreams]

I wish i could pull that off especially the way gas prices are getting. hopefully ill be able to find the problem soon i've got a few more ideas now

[D-UNIT]

not quite sure im still researching the turbo set up but im aiming to get 250 or 300hp. I basically wanna get my gas issue settled before i go buying anything else. I asked what decarbonizing was cuz ive never heard of TB cleaner refered to as that. What I want to know is how is it that carbon gets into the TB.

Carbon gets in there from your EGR system and PVC system. Might want to check your fan clutch.