Why do my MPG's suck so badly?
Thread Starter
2nd Gear Member
Joined: Jun 2009
Posts: 401
From: Texas
Why do my MPG's suck so badly?
I have full exhaust, 3.73's, an sct tune for 93, and a K&N filter with the snorkel removed. I get such ****ty MPG's. I can almost watch the gauge go down when I get on it.
I have all of the correct o2 extenders and MIL eliminators, no CEL's what so ever.
I'm planning on getting a tune after I get a tb/plenum. I know this will help some.
Did the headers and new h pipe make them go down? The computer compensating for something? I have no header/exhaust leaks.
IDK.
I have all of the correct o2 extenders and MIL eliminators, no CEL's what so ever.
I'm planning on getting a tune after I get a tb/plenum. I know this will help some.
Did the headers and new h pipe make them go down? The computer compensating for something? I have no header/exhaust leaks.
IDK.
6th Gear Member
Joined: Oct 2006
Posts: 10,551
From: Texas
I think your tune is really rich. Iv noticed a substantial amount of people who have SCT tuners get terrible gas mileage while using a tune generated from the SCT factory. I have more mods than you and I get about 26 mpg highway with 4.10s. Im 99% sure your tune is just rich.
Last edited by H0SS302; May 13, 2010 at 12:05 AM.
is my username.
Joined: May 2006
Posts: 13,808
From: Earth
It might be time to perform some regular maintenance.
Fuel filter, spark plugs, clean/change air filter, etc. Also, check your tire pressures and remove any extra crap that's in the trunk or back seat area.
+1 to H0ssyboy. Your tune might just be very rich.
Fuel filter, spark plugs, clean/change air filter, etc. Also, check your tire pressures and remove any extra crap that's in the trunk or back seat area.
+1 to H0ssyboy. Your tune might just be very rich.
Thread Starter
2nd Gear Member
Joined: Jun 2009
Posts: 401
From: Texas
I change the mobile 1 synthetic every 2.5k, and wash the K&N every oil change...
it got amazing mpg's before i did **** to it.
I checked the plugs and they're mint and gapped correctly. Got a new fuel filter 5k ago.
only think in the car is my *** and my bat. yes ghetto.
5th Gear Member
Joined: Nov 2007
Posts: 4,955
From: Maryland
1. your car has a snorkel? i thought they belonged on jeeps?
2. why are you wasting your money on synthetic then changing it even before a dyno oil would need changed? Im all for maintaining a car but there is such thing as overkill.
3.I think hoss is spot on, same thing happened to my buddys 99 GT the SCT canned tuned was waaaay to rich, they don't wanna be responsible for blowing up anyones car.
2. why are you wasting your money on synthetic then changing it even before a dyno oil would need changed? Im all for maintaining a car but there is such thing as overkill.
3.I think hoss is spot on, same thing happened to my buddys 99 GT the SCT canned tuned was waaaay to rich, they don't wanna be responsible for blowing up anyones car.
Thread Starter
2nd Gear Member
Joined: Jun 2009
Posts: 401
From: Texas
1. your car has a snorkel? i thought they belonged on jeeps?
2. why are you wasting your money on synthetic then changing it even before a dyno oil would need changed? Im all for maintaining a car but there is such thing as overkill.
3.I think hoss is spot on, same thing happened to my buddys 99 GT the SCT canned tuned was waaaay to rich, they don't wanna be responsible for blowing up anyones car.
2. why are you wasting your money on synthetic then changing it even before a dyno oil would need changed? Im all for maintaining a car but there is such thing as overkill.
3.I think hoss is spot on, same thing happened to my buddys 99 GT the SCT canned tuned was waaaay to rich, they don't wanna be responsible for blowing up anyones car.
and it's no big deal to change oil, i like doing it.
6th Gear Member
Joined: Oct 2006
Posts: 10,551
From: Texas
