2001 Blazer Gas Mileage Problem

DANAL · 11-14-2005, 12:25 PM

PLEASE HELP! I am trying to find out what the problem is with my 2001 S-10 blazer. I am getting really bad gas milage, i have had it to 2 different shops and they both tell me different things. The 1st one says my timing is off, it is at -15 and they say it should be at 0. He wants to make a bracket for the distrubitor to fake out the computer. The second one say no my timing should be at -15 and that my fuel pump is the problem. they say it is 10lbs low holding fuel pressure, well i bought a new fuel pump, oem from the dealer, and now my mileage is worse( i was geting about 164 mile to a full tank, now i am only getting 140 per full tank). i Have already changed the theromstat, dis a complete tune up and had a fuel injection cleaning done. does any one have any idea what my timing should be set at (i know is is set by the computer, but what is that setting) or have any suggestions on whay i am getting such bad gas milagem and what i can try next??? i cant afford this for 2 much longer

AMcCann · 11-14-2005, 05:21 PM

What kind of gas mileage do you get (the Avg Econ on the little overhead display)? I drive a 2001 Blazer too and I'm pretty sure I get 17.1 mpg, all my driving is in town, and I'm a very conservative driver. A few things I've done are replace the fuel filter, replace the airfilter (you dont need to buy any special kit, just buy a new filter) and I hacksawed the snorkel off the front of the air box then hacksawed the bottom of the airbox off.

AMcCann

DANAL · 11-14-2005, 06:18 PM

I do not have the overhead display as on option on my blazer, but i figure it out every time i fill up and it varies between 9-11 miles per gallon and i just replaced the filters less thsn 6 months ago....when i did a complete tun up

DANAL · 11-14-2005, 06:58 PM

someone said to check my tire pressure. i had on of the guys i work with check it and all my tires were way low. i jave 31x10's on the blazer which call for 50psi cold, when he checked them the front tires had 21psi and the rear tires has 18psi. can that really account for the bad gas mielage?

94fivespeed · 11-14-2005, 07:11 PM

I have a 04 blazer x and im getting around 12-13 mpg which sucks ass. on my 94 s10 i get 24-26 mpg and i drive the crap out of the s10 and always get 400 miles on a tank

sdimess · 11-14-2005, 07:16 PM

Quote: Originally Posted by DANAL

someone said to check my tire pressure. i had on of the guys i work with check it and all my tires were way low. i jave 31x10's on the blazer which call for 50psi cold, when he checked them the front tires had 21psi and the rear tires has 18psi. can that really account for the bad gas mielage?

that could be the drop in mpg that you noticed. Rolling around those big of tires prob don't help all that much either. Can't help you with the timming though.

devilman13xx · 11-14-2005, 07:19 PM

you change the cap and rotor? what kind of plugs you runnin? 2 or 4 door? any performace problems or just poopy mileage?

devilman13xx · 11-14-2005, 07:27 PM

according to mitchell on demand it should be 5 degrees below TDC
fuel pressure should be 60-66psi
injector resitance should be 11-14 ohms
tps sensor output should be 1.0-4.0 volts
firing order is 1-6-5-4-3-2

hope that helps

00blazin43 · 12-02-2005, 12:31 PM

I have 00 LT 4door I get about 215 to a tank. I think mine sucks, but I have kinda heavy foot

devilman13xx · 12-02-2005, 12:38 PM

yeah thats a bit low, my 98 4door lt gets about 350 er so to the tank, the lil overhead dealy says im getting like 18-19mpg i have a bit of heavy foot and a ton of ccrap in the back ive also noticed i get better mpg at 60 than i do at 70 or above they seem to have a very tempermental rpm they want to be at for milage

Scott01 · 12-02-2005, 02:41 PM

Quote: Originally Posted by DANAL

someone said to check my tire pressure. i had on of the guys i work with check it and all my tires were way low. i jave 31x10's on the blazer which call for 50psi cold, when he checked them the front tires had 21psi and the rear tires has 18psi. can that really account for the bad gas mielage?

If its a ZR2 15-18 is normal.Air up your tires and go from there.

Easy48827 · 04-16-2008, 07:56 AM

I was getting 16mpg with Bosch platinum spark plugs. My mechanic sugested going back to stock AC plugs. Says GM specs them for a reason. I did so and mileage increased to 21 mpg highway if I keep it under 70 mph. Hope this helps.

BudRacing · 04-16-2008, 10:35 AM

You're a couple years too late.

cpolaris502 · 04-16-2008, 11:34 AM

thats interesting on the stock plugs. i get a little over 300 miles to the tank with 2wd 5spd. about 22.5mpg hwy.

BudRacing · 04-16-2008, 01:01 PM

You could probably do better than that with a 5 speed. I do with an auto.

cpolaris502 · 04-16-2008, 01:43 PM

ill have to try for better this summer i guess. i just put in a bravada over head console last week. i thought that was really good.

BudRacing · 04-16-2008, 03:38 PM

It's not bad... for an auto, but with a 5 speed you have more potential. A few mods can up your mileage quite a bit.

cpolaris502 · 04-16-2008, 07:30 PM

i have a k&n intake and all new ignition that i put in last fall, what are these mods you speak of.

BudRacing · 04-16-2008, 08:15 PM

Higher flowing muffler, e-fan, underdrive pulleys

97 blazer · 04-16-2008, 11:21 PM

wow that is bad...im getting 21mpg in town i have magnaflow exhaust w/2.5" pipe /e-fan/air filter/all synthetic fluids and everysingle filter/ ignition component is new and ive got 143K mi on mine stock pcm /timing

Goran · 04-18-2008, 09:37 AM

try changing the oxygen sensors...

I did a complete tuneup after 200K and noticed no change in mileage.... i'm thinking about changing the oxy sensors...

tuneup was plugs/wires/cap/rotor/pcv valve and airfilter... all was AC Delco except for the airfilter (K&N - Recharge...)

BanginJimmy · 04-18-2008, 03:30 PM

Quote: Originally Posted by cpolaris502

thats interesting on the stock plugs.

Yes it is. I am busing bosch platinums and I am getting about 17mpg.

beaniebmx · 04-20-2008, 03:50 PM

these and 2.5/2.8 love stock parts.

i got 4 spark plugs from walmart and a fuel filter and air filter on my 2.5l 1st gen 2wd i traded in on my new 00 gmc jimmy 4wd

well it was doing just fine, got about 26mpg highway driving mad, and then after the dealership replaced ignition module, i started having problems. computer was bad and still was after i replaced it i guess.

drove it at 55mph constant after dealership.. spit and sputtered.. CABOOM spark plug tip disentigrated. put another one in.. same thing, same plug, same cylinder.

put some acdelco plugs in and it ran better, and got better mileage by 1-2

11-14-2005, 12:25 PM	#1
DANAL Registered User Age: 45 Join Date: Nov 2005 Posts: 18 Location: User is: OffLine	2001 Blazer Gas Mileage Problem PLEASE HELP! I am trying to find out what the problem is with my 2001 S-10 blazer. I am getting really bad gas milage, i have had it to 2 different shops and they both tell me different things. The 1st one says my timing is off, it is at -15 and they say it should be at 0. He wants to make a bracket for the distrubitor to fake out the computer. The second one say no my timing should be at -15 and that my fuel pump is the problem. they say it is 10lbs low holding fuel pressure, well i bought a new fuel pump, oem from the dealer, and now my mileage is worse( i was geting about 164 mile to a full tank, now i am only getting 140 per full tank). i Have already changed the theromstat, dis a complete tune up and had a fuel injection cleaning done. does any one have any idea what my timing should be set at (i know is is set by the computer, but what is that setting) or have any suggestions on whay i am getting such bad gas milagem and what i can try next??? i cant afford this for 2 much longer
	[Reply w/Quote]

11-14-2005, 05:21 PM	#2
AMcCann Stock? Yep :-\ Join Date: Nov 2005 Posts: 542 Location: Iowa User is: OffLine	Re: 2001 Blazer Gas Mileage Problem What kind of gas mileage do you get (the Avg Econ on the little overhead display)? I drive a 2001 Blazer too and I'm pretty sure I get 17.1 mpg, all my driving is in town, and I'm a very conservative driver. A few things I've done are replace the fuel filter, replace the airfilter (you dont need to buy any special kit, just buy a new filter) and I hacksawed the snorkel off the front of the air box then hacksawed the bottom of the airbox off. AMcCann
	[Reply w/Quote]

11-14-2005, 06:18 PM	#3
DANAL Registered User Age: 45 Join Date: Nov 2005 Posts: 18 Location: User is: OffLine	Re: 2001 Blazer Gas Mileage Problem I do not have the overhead display as on option on my blazer, but i figure it out every time i fill up and it varies between 9-11 miles per gallon and i just replaced the filters less thsn 6 months ago....when i did a complete tun up
	[Reply w/Quote]

11-14-2005, 06:58 PM	#4
DANAL Registered User Age: 45 Join Date: Nov 2005 Posts: 18 Location: User is: OffLine	Re: 2001 Blazer Gas Mileage Problem someone said to check my tire pressure. i had on of the guys i work with check it and all my tires were way low. i jave 31x10's on the blazer which call for 50psi cold, when he checked them the front tires had 21psi and the rear tires has 18psi. can that really account for the bad gas mielage?
	[Reply w/Quote]

11-14-2005, 07:11 PM	#5
94fivespeed static Age: 28 Join Date: Apr 2005 Posts: 205 Location: Columbia, SC User is: OffLine	Re: 2001 Blazer Gas Mileage Problem I have a 04 blazer x and im getting around 12-13 mpg which sucks ass. on my 94 s10 i get 24-26 mpg and i drive the crap out of the s10 and always get 400 miles on a tank Last edited by 94fivespeed : 11-14-2005 at 07:13 PM.
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11-14-2005, 07:16 PM	#6
sdimess HARÍA PIS EN SU EXTREMO Age: 25 Join Date: Oct 2003 Posts: 6,544 Location: Chassell Michigan User is: OffLine	Re: 2001 Blazer Gas Mileage Problem Quote: Originally Posted by DANAL someone said to check my tire pressure. i had on of the guys i work with check it and all my tires were way low. i jave 31x10's on the blazer which call for 50psi cold, when he checked them the front tires had 21psi and the rear tires has 18psi. can that really account for the bad gas mielage? that could be the drop in mpg that you noticed. Rolling around those big of tires prob don't help all that much either. Can't help you with the timming though.
	[Reply w/Quote]

11-14-2005, 07:19 PM	#7
devilman13xx Same Poop,Different Scoop Age: 29 Join Date: Jan 2005 Posts: 4,054 Location: Daytona Beach User is: OffLine	Re: 2001 Blazer Gas Mileage Problem you change the cap and rotor? what kind of plugs you runnin? 2 or 4 door? any performace problems or just poopy mileage?
	[Reply w/Quote]

11-14-2005, 07:27 PM	#8
devilman13xx Same Poop,Different Scoop Age: 29 Join Date: Jan 2005 Posts: 4,054 Location: Daytona Beach User is: OffLine	Re: 2001 Blazer Gas Mileage Problem according to mitchell on demand it should be 5 degrees below TDC fuel pressure should be 60-66psi injector resitance should be 11-14 ohms tps sensor output should be 1.0-4.0 volts firing order is 1-6-5-4-3-2 hope that helps
	[Reply w/Quote]

12-02-2005, 12:31 PM	#9
00blazin43 Registered User Age: 26 Join Date: Oct 2005 Posts: 4 Location: User is: OffLine	Re: 2001 Blazer Gas Mileage Problem I have 00 LT 4door I get about 215 to a tank. I think mine sucks, but I have kinda heavy foot
	[Reply w/Quote]

12-02-2005, 12:38 PM	#10
devilman13xx Same Poop,Different Scoop Age: 29 Join Date: Jan 2005 Posts: 4,054 Location: Daytona Beach User is: OffLine	Re: 2001 Blazer Gas Mileage Problem yeah thats a bit low, my 98 4door lt gets about 350 er so to the tank, the lil overhead dealy says im getting like 18-19mpg i have a bit of heavy foot and a ton of ccrap in the back ive also noticed i get better mpg at 60 than i do at 70 or above they seem to have a very tempermental rpm they want to be at for milage
	[Reply w/Quote]

12-02-2005, 02:41 PM	#11
Scott01 ZR2 member Age: 37 Join Date: Mar 2002 Posts: 1,903 Location: Northeast Ky User is: OffLine	Re: 2001 Blazer Gas Mileage Problem Quote: Originally Posted by DANAL someone said to check my tire pressure. i had on of the guys i work with check it and all my tires were way low. i jave 31x10's on the blazer which call for 50psi cold, when he checked them the front tires had 21psi and the rear tires has 18psi. can that really account for the bad gas mielage? If its a ZR2 15-18 is normal.Air up your tires and go from there.
	[Reply w/Quote]

04-16-2008, 07:56 AM	#12
Easy48827 Registered User Join Date: Jan 2008 Posts: 10 Location: User is: OffLine	Re: 2001 Blazer Gas Mileage Problem I was getting 16mpg with Bosch platinum spark plugs. My mechanic sugested going back to stock AC plugs. Says GM specs them for a reason. I did so and mileage increased to 21 mpg highway if I keep it under 70 mph. Hope this helps.
	[Reply w/Quote]

04-16-2008, 10:35 AM	#13
BudRacing Molon Labe Age: 23 Join Date: Aug 2004 Posts: 5,072 Location: Decatur, Ga User is: OffLine	Re: 2001 Blazer Gas Mileage Problem You're a couple years too late.
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04-16-2008, 11:34 AM	#14
cpolaris502 SmartTrak FTW Age: 21 Join Date: Jul 2005 Posts: 16,558 Location: Rogers, MN User is: Online	Re: 2001 Blazer Gas Mileage Problem thats interesting on the stock plugs. i get a little over 300 miles to the tank with 2wd 5spd. about 22.5mpg hwy.
	[Reply w/Quote]

04-16-2008, 01:01 PM	#15
BudRacing Molon Labe Age: 23 Join Date: Aug 2004 Posts: 5,072 Location: Decatur, Ga User is: OffLine	Re: 2001 Blazer Gas Mileage Problem You could probably do better than that with a 5 speed. I do with an auto.
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04-16-2008, 01:43 PM	#16
cpolaris502 SmartTrak FTW Age: 21 Join Date: Jul 2005 Posts: 16,558 Location: Rogers, MN User is: Online	Re: 2001 Blazer Gas Mileage Problem ill have to try for better this summer i guess. i just put in a bravada over head console last week. i thought that was really good.
	[Reply w/Quote]

04-16-2008, 03:38 PM	#17
BudRacing Molon Labe Age: 23 Join Date: Aug 2004 Posts: 5,072 Location: Decatur, Ga User is: OffLine	Re: 2001 Blazer Gas Mileage Problem It's not bad... for an auto, but with a 5 speed you have more potential. A few mods can up your mileage quite a bit.
	[Reply w/Quote]

04-16-2008, 07:30 PM	#18
cpolaris502 SmartTrak FTW Age: 21 Join Date: Jul 2005 Posts: 16,558 Location: Rogers, MN User is: Online	Re: 2001 Blazer Gas Mileage Problem i have a k&n intake and all new ignition that i put in last fall, what are these mods you speak of.
	[Reply w/Quote]

04-16-2008, 08:15 PM	#19
BudRacing Molon Labe Age: 23 Join Date: Aug 2004 Posts: 5,072 Location: Decatur, Ga User is: OffLine	Re: 2001 Blazer Gas Mileage Problem Higher flowing muffler, e-fan, underdrive pulleys
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04-16-2008, 11:21 PM	#20
97 blazer EX-REFLECTOR COLLECTOR Age: 30 Join Date: Apr 2008 Posts: 80 Location: FL, User is: OffLine	Re: 2001 Blazer Gas Mileage Problem wow that is bad...im getting 21mpg in town i have magnaflow exhaust w/2.5" pipe /e-fan/air filter/all synthetic fluids and everysingle filter/ ignition component is new and ive got 143K mi on mine stock pcm /timing Last edited by 97 blazer : 04-16-2008 at 11:23 PM. Reason: add
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04-18-2008, 09:37 AM	#21
Goran Registered User Join Date: Apr 2006 Posts: 203 Location: Ontario User is: OffLine	Re: 2001 Blazer Gas Mileage Problem try changing the oxygen sensors... I did a complete tuneup after 200K and noticed no change in mileage.... i'm thinking about changing the oxy sensors... tuneup was plugs/wires/cap/rotor/pcv valve and airfilter... all was AC Delco except for the airfilter (K&N - Recharge...)
	[Reply w/Quote]

04-18-2008, 03:30 PM	#22
BanginJimmy Registered User Age: 30 Join Date: Feb 2005 Posts: 1,615 Location: dallas, ga User is: OffLine	Re: 2001 Blazer Gas Mileage Problem Quote: Originally Posted by cpolaris502 thats interesting on the stock plugs. Yes it is. I am busing bosch platinums and I am getting about 17mpg.
	[Reply w/Quote]

04-20-2008, 03:50 PM	#23
beaniebmx Has Training Wheels Join Date: Jun 2007 Posts: 2,588 Location: Iowa User is: OffLine	Re: 2001 Blazer Gas Mileage Problem these and 2.5/2.8 love stock parts. i got 4 spark plugs from walmart and a fuel filter and air filter on my 2.5l 1st gen 2wd i traded in on my new 00 gmc jimmy 4wd well it was doing just fine, got about 26mpg highway driving mad, and then after the dealership replaced ignition module, i started having problems. computer was bad and still was after i replaced it i guess. drove it at 55mph constant after dealership.. spit and sputtered.. CABOOM spark plug tip disentigrated. put another one in.. same thing, same plug, same cylinder. put some acdelco plugs in and it ran better, and got better mileage by 1-2
	[Reply w/Quote]