03-24-2010, 01:23 AM
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#1
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GL Member
Join Date: Dec 2007
Location: Honolulu, HAWAII!
Posts: 683
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eco giving 19mpg
lately my gas consumption has got down to 19mpg, much of this was freeway.
i never calculated the mpg before, but now i'm filling it up more often, so i took notice and started keeping track.
mods i have are pacesetter header, cai, larger wheels/tires
took it in to the dealership and they didn't find anything wrong.
got it back no charge and replaced the spark plugs and fuel filter myself. i have called the dealership trying to make certain they tested the iat sensor, but they ahven't got back to me yet.
any idea what else could be wrong w/it?
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sigs are annoying
Last edited by darksobsession : 03-24-2010 at 07:41 PM.
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03-24-2010, 01:26 AM
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#2
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Canada's Ghost
Join Date: Sep 2008
Location: Alberta
Posts: 1,831
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Yikes! I don't know what could be wrong with it, I get 38 mpg in higher elevations (yes that is MPG and not KMPL) I would suggest checking tire air pressure.
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03-24-2010, 01:32 AM
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#3
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Premier V.I.P. Member
Join Date: Feb 2009
Location: Oxbow SK
Posts: 1,385
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i get the same as abhelirazor (your name is too hard to type, nevermind. reread it, makes a little more sense now) and better yet at times.
check your normal things. tire psi, spark plugs, air filter. if those are all good. maybe try replacing your upstream o2 sensor. that has alot to do with mpg.
also try seafoaming your engine.
hopefully this helps you out
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2002 Alero w/ 2.2 ecotec 5 speed
power window conversion, heated leather seats, 16" rims, high & low hids, auto dimming rear mirror, speedbuilt front and rear sway bars, poly bushings all around.
2005 Silverado 2500HD w/ 6.0l Vortec 4L80E
Tuned 6.0l, exhaust, intake, with 450000km on the odometer. Tow Rig
1985 Pontiac Trans Am GTA w/ 5.7 Vortec 700r4
mild vortec 350 with 4 speed auto. performance suspension. factory gold color. project car
Last edited by colonel6632 : 03-24-2010 at 01:35 AM.
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03-24-2010, 01:35 AM
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#4
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Canada's Ghost
Join Date: Sep 2008
Location: Alberta
Posts: 1,831
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Quote:
Originally Posted by colonel6632
i get the same as abhelirazor (your name is too hard to type) and better yet at times.
check your normal things. tire psi, spark plugs, air filter. if those are all good. maybe try replacing your upstream o2 sensor. that has alot to do with mpg.
also try seafoaming your engine.
hopefully this helps you out
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Yes do those for sure, maybe even get a compression check.
Colonel and anyone else on the site can just call me Evan.
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03-24-2010, 07:42 PM
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#5
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GL Member
Join Date: Dec 2007
Location: Honolulu, HAWAII!
Posts: 683
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tire pressure and air filter ok
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sigs are annoying
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03-24-2010, 08:27 PM
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#6
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GLS member
Join Date: Jun 2007
Location: Utica, Michigan
Posts: 2,227
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maybe a clogged fuel filter? also, how do you drive your car? keeping it below 3K when accelerating and using cruise control means all the difference between 20 mpg and 29 mpg for me with my car.
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2000 Chevrolet Malibu LS
2000 Oldsmobile Alero GL (sold)
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03-24-2010, 10:15 PM
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#7
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GL Member
Join Date: Dec 2007
Location: Honolulu, HAWAII!
Posts: 683
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just changed the fuel filter when i got it back from dealership, along with my plugs.
driving the same way i've always been, but having to fill up a lot more, so def some kind of prob.
__________________
sigs are annoying
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03-24-2010, 10:42 PM
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#8
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Premier V.I.P. Member
Join Date: Feb 2009
Location: Oxbow SK
Posts: 1,385
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clogged fuel filter shouldn't really affect mpgs. might affect power more, and the way the car runs
__________________
2002 Alero w/ 2.2 ecotec 5 speed
power window conversion, heated leather seats, 16" rims, high & low hids, auto dimming rear mirror, speedbuilt front and rear sway bars, poly bushings all around.
2005 Silverado 2500HD w/ 6.0l Vortec 4L80E
Tuned 6.0l, exhaust, intake, with 450000km on the odometer. Tow Rig
1985 Pontiac Trans Am GTA w/ 5.7 Vortec 700r4
mild vortec 350 with 4 speed auto. performance suspension. factory gold color. project car
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03-24-2010, 11:05 PM
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#9
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GL Member
Join Date: Aug 2008
Location: Kansas
Posts: 884
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clogged cat?
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2002 Oldsmobile Alero GL 1990 Nissan 300zx n/a 1991 Nissan 300zx TT
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03-24-2010, 11:25 PM
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#10
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GLS member
Join Date: Oct 2006
Location: Phoenix
Posts: 4,284
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mine did the same thing too after I put in the WAI and exhaust. I just thought it was cause I idle all the time
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2003 2.2 Eco http://www.cardomain.com/ride/2478473 SOLD
1994 Chevy Suburban aka The Zombie Mower 4" Rancho suspension lift 2" body lift. 315/75/16 Mickey Thompson Radial M/Ts 10000K HID 12" JL W3 Subs in custom box 1000W Alpine mono amp 1F capacitor 6.5" JL mids 4X6 Pioneers in dash 450W Alpine 4 channel Dynomax cat & exhaust
2007 Cadillac Escalade EXT chameleon paint, Cadillac 22" wheels
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03-25-2010, 01:34 AM
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#11
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GL Member
Join Date: Dec 2007
Location: Honolulu, HAWAII!
Posts: 683
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have had the CAI and other mods for a long time.
excessive gas consumption has only started recently.
have you fixed your prob yet or are you still getting bad mpg?
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sigs are annoying
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03-25-2010, 02:11 AM
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#12
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GLS member
Join Date: Oct 2006
Location: Phoenix
Posts: 4,284
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I haven't done anything, I notice when I do drive on the freeway for long distances I get around 26 (the only trips I've done have included a lot of elevation change though so I wouldn't read too much into that). I only drive 4 miles to work and idle a lot in between and stop lights or dropping my daughter at school so I just credit it to that, but if you are having the same problem, I'd be interested in knowing what was causing it and I'd check mine out
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2003 2.2 Eco http://www.cardomain.com/ride/2478473 SOLD
1994 Chevy Suburban aka The Zombie Mower 4" Rancho suspension lift 2" body lift. 315/75/16 Mickey Thompson Radial M/Ts 10000K HID 12" JL W3 Subs in custom box 1000W Alpine mono amp 1F capacitor 6.5" JL mids 4X6 Pioneers in dash 450W Alpine 4 channel Dynomax cat & exhaust
2007 Cadillac Escalade EXT chameleon paint, Cadillac 22" wheels
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03-25-2010, 06:41 AM
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#13
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Gone
Join Date: Mar 2004
Location: Lockport Ny
Posts: 19,244
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even at idle... a wai should still improve mpg... more hot air + fuel = better than stock
so far, I have no advice other then whats been said, though.
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03-25-2010, 12:35 PM
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#14
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GLS member
Join Date: Oct 2006
Location: Phoenix
Posts: 4,284
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I'm sure I need to look into it, but I drive 18 miles....a day...and that includes going home for lunch so it hasn't been that pressing of an issue for me
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2003 2.2 Eco http://www.cardomain.com/ride/2478473 SOLD
1994 Chevy Suburban aka The Zombie Mower 4" Rancho suspension lift 2" body lift. 315/75/16 Mickey Thompson Radial M/Ts 10000K HID 12" JL W3 Subs in custom box 1000W Alpine mono amp 1F capacitor 6.5" JL mids 4X6 Pioneers in dash 450W Alpine 4 channel Dynomax cat & exhaust
2007 Cadillac Escalade EXT chameleon paint, Cadillac 22" wheels
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03-26-2010, 01:12 AM
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#15
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GL Member
Join Date: Dec 2007
Location: Honolulu, HAWAII!
Posts: 683
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so finally got in touch with dealership guy, he said mechanics didn't check iat sensor.
am taking car in on sat to have that tested.
anything else it could be?
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sigs are annoying
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03-26-2010, 01:14 AM
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#16
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GLS member
Join Date: Oct 2006
Location: Phoenix
Posts: 4,284
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that makes sense, could be running rich if it's picking up the wrong temp
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2003 2.2 Eco http://www.cardomain.com/ride/2478473 SOLD
1994 Chevy Suburban aka The Zombie Mower 4" Rancho suspension lift 2" body lift. 315/75/16 Mickey Thompson Radial M/Ts 10000K HID 12" JL W3 Subs in custom box 1000W Alpine mono amp 1F capacitor 6.5" JL mids 4X6 Pioneers in dash 450W Alpine 4 channel Dynomax cat & exhaust
2007 Cadillac Escalade EXT chameleon paint, Cadillac 22" wheels
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03-26-2010, 08:44 AM
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#17
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Gone
Join Date: Mar 2004
Location: Lockport Ny
Posts: 19,244
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tires - check
air filter -check
fuel filter -check
spark plugs -check
hmm.. leaking fuel injectors? does it start rough at all?
clogged cat, possibly
maybe clean your TB/MAF (unlikely, but could be giving a wrong answer) If thats the problem, it might be caught by the IAT test though
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03-26-2010, 07:22 PM
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#18
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GX Member
Join Date: Nov 2009
Location: Dodgeville, MI
Posts: 157
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Did your gas station just start using ethanol blended gas?
You say larger wheels/tires. is the final diameter actually larger than stock? Was your speedo recalibrated?
Last edited by mbeals : 03-26-2010 at 07:25 PM.
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03-26-2010, 07:25 PM
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#19
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GL Member
Join Date: Dec 2007
Location: Honolulu, HAWAII!
Posts: 683
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no, hawaii's been e85 for awhile now
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sigs are annoying
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03-26-2010, 10:34 PM
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#20
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GX Member
Join Date: Nov 2009
Location: Dodgeville, MI
Posts: 157
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How long have you had the headers on? Did you retorque the bolts? I wonder if you have a slight exhaust leak richening up the mixture. It was mentioned before, but how old is the O2 and did you do anything to it when you moved it for the new exhaust? They are supposed to throw a code when they get lazy, but sometimes they can be lazy, but not lazy "enough" for a cel. A live view of sensor output while driving in closed loop would help a lot.
Are you having any drivability issues at all? Even something minor? Slight hesitation? Surging? Popping? Does it happen when warm? Cold?
It would be interesting to reset the pcm to default the fuel trims and see what happens.
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