Poor Gas Mileage [Archive] - GrandAmGT.com Forum

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LeahKatrinaVS
02-27-2012, 06:18 PM
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!

KillNThrill24
02-27-2012, 08:09 PM
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!

Atoms4Piece
02-27-2012, 08:23 PM
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).

MichaelY
02-27-2012, 10:19 PM
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.

afterdeath07
03-08-2012, 10:51 PM
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

blckgagt
03-09-2012, 11:00 AM
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.

03GtinWI
03-11-2012, 12:15 PM
Try chaining your front o2 sensor. After 80k you should change it anyway so it cant hurt to try and an easy diy.

tw0123
03-11-2012, 09:25 PM
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.

lol 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!!

KillNThrill24
03-11-2012, 11:12 PM
lol 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 lol

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