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Old 02-27-2012, 06:18 PM   #1
LeahKatrinaVS
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Join Date: Jan 2012
Location: Oshawa Ontario
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Vehicle: 2000 Grand Am SE
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Poor Gas Mileage

I purchased a 2000 Grand Am SE 3.4l with 116,000km on it in the summer of 2011. I have only been getting 260 kilometers per tank if I'm lucky.

The power steering pump, air filter, fuel filter, oil, spark plugs and wires have been changed all within the last 2,000km (119,000-121,000). I am sure not to go over 3000 rpm when accelerating unless I am merging on to a highway.

Today from 3/4 to 1/2 tank I received about 40 kilometers (city and highway driving). I am running out of options and need some advice on where to go with this.

Thanks!
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Old 02-27-2012, 08:09 PM   #2
KillNThrill24
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being from the states that converts to 161mi out of a tank.. which even with my heavy lead foot i avg about 220 out of a tank, or about 354km. theres def something wrong with it. check to make sure all your routine maintenance is done, plugs, wires, oil changed, air filter. then check for any leaks like vacuum or exhaust. i have almost 188000mi or about 302556km and like i said i get far better. like 18mpg per tank, if i drive under 3000rpm for a tank i get about 22mpg. you should def check all that stuff tho!
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00 Mustang GT:
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Old 02-27-2012, 08:23 PM   #3
Atoms4Piece
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Join Date: Feb 2012
Location: Greenwood, IN
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Vehicle: 2000 Grand Am GT Coupe
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I've got a 2000 GAGT with 170K miles on it. I drove (no joke) from Huntsville, AL, to my apt in Greenwood, IN on one tank of gas. 380 miles to the dot, this past January. When I got to the Indiana state line I had 1/4 of a tank and drove the rest of the 100 mile journey home and had the gas light come on 96 miles into Indiana. This is not a joke (of course I did coast behind a semi truck for 30-40 miles in Indiana, but that's neither here nor there).
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Old 02-27-2012, 10:19 PM   #4
MichaelY
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Vehicle: 2000 Grand Am GT 4 DR
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HO2 sensor (Heated Oxygen Sensor) it's the upper one on the manifold. Anyways, when these go bad they let fuel run continuously. Something to maybe check out? I know this is always a sign of poor mileage. Just a thought.
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Old 03-08-2012, 10:51 PM   #5
afterdeath07
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i know it sounds obvious but your not leaking fuel are you. park it in the drive way and let it idle for 15 min or so and give it a good look over for puddles or smells. just my 2 cents sounds like your regular maintenance is up to par
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Old 03-09-2012, 11:00 AM   #6
blckgagt
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Quote:
Originally Posted by afterdeath07 View Post
i know it sounds obvious but your not leaking fuel are you. park it in the drive way and let it idle for 15 min or so and give it a good look over for puddles or smells. just my 2 cents sounds like your regular maintenance is up to par
I know when I had a fuel leak, I never noticed any fuel on my driveway. Gasoline evaporates very quickly so u may not even see it.
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Old 03-11-2012, 12:15 PM   #7
03GtinWI
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Try chaining your front o2 sensor. After 80k you should change it anyway so it cant hurt to try and an easy diy.
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Old 03-11-2012, 09:25 PM   #8
tw0123
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Quote:
Originally Posted by blckgagt View Post
I know when I had a fuel leak, I never noticed any fuel on my driveway. Gasoline evaporates very quickly so u may not even see it.
so true... i blew the o ring under the uim and gas was pouring onto the top of my motor... never had a puddle anywhere, i just thought the car would blow up!!
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Old 03-11-2012, 11:12 PM   #9
KillNThrill24
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Quote:
Originally Posted by tw0123 View Post
so true... i blew the o ring under the uim and gas was pouring onto the top of my motor... never had a puddle anywhere, i just thought the car would blow up!!
interesting when mine went it shot fuel out about 3-4in from the fuel rail it was undrivable till i replaced it
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99 GAGT:
black painted rims, tinted tail lights, 6000k HID headlights and fogs (DRL disabled), pioneer AVH-P3200BT, 2 pioneer 6x9's, rockford p1 6.5's in the front doors, american bass XD 15's in custom ported box, RE xt4000de-v2 on subs, rockford t400-2 on highs, custom intake, 42% tint, the mufflerless madman...

00 Mustang GT:
Ford Racing 4.10's, BBK cold air, Bassani SS catted x (no cats) 3in Borla XR1's, Eibach's, B&M Short Throw and T handle, SCT Race91 tuned

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Old 03-12-2012, 09:36 AM   #10
shiwnath
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Many people have had luck with seafoam, while others say it doesnt work. I'd say it's worth a shot.
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