I have a problem pertaining my gas mileage. I have searched but don't know what could be wrong still.

Here Is What I have replaced

Front o2 Sensor
Spark Plugs
Wires

I have a heavy foot sometimes but I dont think it would cause me to get 200miles a tank, which averages out to 16mpg for me this is city driving.

I see oil around my EGR valve, is it possible its shot? I am curious as to what kind of difference that makes, because I know they make an EGR block-off kit and If mileage suffered that bad without it I dont see why they would make one. Anyway, is it possible that it could be going dead and just not be shooting a code? What does it cost to get this replaced? My car has 97K miles

If someone can respond to this a.s.a.p I would greatly appreciate it.

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

I had issues with mine, even after I changed the o2 sensor. I unhooked the battery, touched the two leads together (for what reason, i dunno), but there weren't connected to anything, I guess to ground out any caps or something

While the batter was unhooked, I put a new sensor in (went back to vatozone and swapped it out). It worked fine after that.

The reason I unhooked the battery and shorted the leads was because when the motor was running, I wasn't getting anything from the o2 wiring harness. Not even the power from the heater wire, as though the ECU sensed something was wrong and turned it off, I dunno. After I left the battery off for a while, hooked it back up, everything worked fine.

~Luke
Facebook
1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

I have tried that before didnt see any results

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

you make short trips? that kills fuel economy, lotsa energy is wasted heating stuff up to operating temp, then arriving at your destination.

2005 Legacy GT Ltd, Garnet Red Pearl
speak softly and spool a big turbo

Someting is def wrong. Finish up the tune up. do a fuel filter if you havent already. IF you have access to a Datalogger or scanner check to see what the O2 counts are? Also check to see if you have a leaky injector, that could do it.

When you changed the Plugs what did they look like? color?

Terry

Definatly check for leaky injector, i had a problem with my 95gs only got like 220 miles to the tank replaced o2, egr no change, than i noticed if i drove with the windows down i smelled gas really bad, discovered a leaky injector, fixed it and gas milage went up to about 300 a tank, i now have a 98 rs and get anywhere from 300-350 a tank.

98 RS: Mods: Custom Stage 2 Turbo kit , 55mm throttle body, gutted cat, evo cat back exhaust, p/p intake manifold,p/p Head, af-x underdrive pulley, B&M short throw shifter,Built bottom end Je pistons eagle rods 8.8:1 compression.





Status:Up and running again! nice new paint

Custom stage 2 hahn turbo kit
Hahn Super 16g turbo (ceramic coated)
Hahn manifold (ceramic coated)
Hahn Downpipe assembly
Hahn intercooler piping smic
Hahn oil line kit
Type s bov
2G Gsx smic
walbro 255 fuel pump
Synapse missing link
Vortech s-fmu
NGK Bkr7e11 Plugs
A-pillar w/boost, a/f, oil pressure gauges


New Addition: 2007 Eclipse GT 6 speed

The Plugs were a brownish color but were of pretty normal wear not burnt away or corroded. I don't have a leaky injector, I would deffintley smell it If I were plus I looked at the fuel rail and didnt see or smell it. Question about this EGR valve though because this looks in bad shape. Is this valve suppose to open all the way? It only pops open a lil bit.

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

Not sure if this helps or not but i removed my egr and the difference in gas milage was very minute at times i dont even notice a change, i remember hitting like 330 per tank when i had it on but that was like rolling into the gas station on dead empty mine crapped out so i just took it off, seriously doubt your egr is killing your fuel that much, and if your plugs were brownish than theres no real sign of running rich so there goes that hope you figure it out. what kinda gas milage were you getting b4.

98 RS: Mods: Custom Stage 2 Turbo kit , 55mm throttle body, gutted cat, evo cat back exhaust, p/p intake manifold,p/p Head, af-x underdrive pulley, B&M short throw shifter,Built bottom end Je pistons eagle rods 8.8:1 compression.





Status:Up and running again! nice new paint

Custom stage 2 hahn turbo kit
Hahn Super 16g turbo (ceramic coated)
Hahn manifold (ceramic coated)
Hahn Downpipe assembly
Hahn intercooler piping smic
Hahn oil line kit
Type s bov
2G Gsx smic
walbro 255 fuel pump
Synapse missing link
Vortech s-fmu
NGK Bkr7e11 Plugs
A-pillar w/boost, a/f, oil pressure gauges


New Addition: 2007 Eclipse GT 6 speed

I have owned my car for over a year and ever since I have had it, I have never been able to break 200 miles a tank filled to 12-13 gallons. Maybe if the EGR valve is dirty and doesnt work correctly it causes more harm than just blocking it off all together. All I know is that it dirty as hell around there on the head. Maybe tommorow night I will fuck with it.

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

Oil is not good around your EGR valve. I know that if you block it off with a plate, you will get to see oil. It's something to do with the vaccuum between the exhaust and intake manifolds. If they don't have the same vaccuum, oil seeps - not good. My recommendation, don't block it off and don't replace it. Purchase a catch can so that you get the best of both worlds.

ive got a 17 gallon tank in my car that might be the difference however you should get more than 16mpg either way, its possible your sending unit might not be working correctly ever run out of gas?? i dont know im just throwing things out here but from what your describing id say you have to have a leak somewhere, my old car would only leak while i was driving, and somehow the gas was evaporating so at idle or even while it was sitting off no aparent leak. sorry dude let me know when you figure it out

98 RS: Mods: Custom Stage 2 Turbo kit , 55mm throttle body, gutted cat, evo cat back exhaust, p/p intake manifold,p/p Head, af-x underdrive pulley, B&M short throw shifter,Built bottom end Je pistons eagle rods 8.8:1 compression.





Status:Up and running again! nice new paint

Custom stage 2 hahn turbo kit
Hahn Super 16g turbo (ceramic coated)
Hahn manifold (ceramic coated)
Hahn Downpipe assembly
Hahn intercooler piping smic
Hahn oil line kit
Type s bov
2G Gsx smic
walbro 255 fuel pump
Synapse missing link
Vortech s-fmu
NGK Bkr7e11 Plugs
A-pillar w/boost, a/f, oil pressure gauges


New Addition: 2007 Eclipse GT 6 speed

Nope, never leaks ever.. And I leave my car running and sit outside of it often talking to people and I never have the problem. Fuel sending unit is good, I have never run out of gas. And how the hell do you have a 17 gallon tank? God that must be a bitch.

I also want to point out that my car does not run rich, and that my compression is 180 on all 4 cylinders.

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

all 1990-1996 eclipse models have a 15.9 gal fuel tank when full, 97,98,99 have a 17 gallon tank but not to get off topic here id go with what the last guy just said he seemed to have a better suggestion than me sorry i couldnt help

98 RS: Mods: Custom Stage 2 Turbo kit , 55mm throttle body, gutted cat, evo cat back exhaust, p/p intake manifold,p/p Head, af-x underdrive pulley, B&M short throw shifter,Built bottom end Je pistons eagle rods 8.8:1 compression.





Status:Up and running again! nice new paint

Custom stage 2 hahn turbo kit
Hahn Super 16g turbo (ceramic coated)
Hahn manifold (ceramic coated)
Hahn Downpipe assembly
Hahn intercooler piping smic
Hahn oil line kit
Type s bov
2G Gsx smic
walbro 255 fuel pump
Synapse missing link
Vortech s-fmu
NGK Bkr7e11 Plugs
A-pillar w/boost, a/f, oil pressure gauges


New Addition: 2007 Eclipse GT 6 speed

2005 Legacy GT Ltd, Garnet Red Pearl
speak softly and spool a big turbo

My tank is 13.5 gallons roughly.. Anyway enough bullshit about the gas tanks. Need a solution to mileage. I took out my EGR today and cleaned it up good. Have no idea if its going to make a difference but there was alot of shit I got out of that thing with brake cleaner. I have been easy on the gas so far, so we will just have to see how it goes. If it does'nt work out, I may just take it to satan to fix. Gas is to expensive for me to be getting this kind of mileage. Also, I thought rear o2 sensor was just for emissions? Keep it coming guys, any other info is greatly appreciated for myself and others who have this problem.

Also as for my driving habits.. I am an automatic and for this tank so far I don't go over 3500-4k when the car shifts. Is that alright to go that high and still try and retain decent gas mileage or is it pushing the car hard still?

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

How do I know if it is stuck open? I see the rod with the plate move down ever so slightly when I rev the car, but other than that the plate inside of it stick firm up at tht top. Can't really explain it, but is this valve suppose to have a long range of motion?

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

have you checked your compression yet?? shitty compression will screw mileage too
doug

14b custom turbo kit, modified starion front mount, 9.6:1 JE pistons/Eagle rods....running 12psi
screw flanders

My Compression was 180 on all 4 cylinders.

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

I am curious on what everyones driving habits are. When do you let the car shift? At what RPM. I use to let it shift at 4500-5000 because our cars are ungodly slow stock and take forever to get going with the low end power.

98' Eclipse GS- Hahn Stage 2- SOLD
02' Honda S2000- SOLD
04' Acura TL- Current Whip

I wish I could help give you some direction, but U peeps prob know more about improving it than I do... the better the gas mileage the better, especially if gas prices are supposed to hit $3/gallon in South Florida by the end of the year.

Anyways, I posted this just for you
http://forums.2gnt.com/dcboard.php?az=show_topic&forum=5&topic_id=88278&mode=full

- J