Why is my 2004 EXT LT trailblazer burning too much gas.

Asked by Jan 13, 2014 at 02:32 PM

Question type: Maintenance & Repair

I have noticed that over the past few months the blazer has been getting less and less
mpgs. There are no codes and if has passed the required emissions test in my state. It
does not run bad. It idles really well and there is no signs of why it is burning more gas.

10 Answers

30

Hello, How much of a change in MPG? Have you been experiencing bitter cold temps or seasonally cool temps (winter)? This can cause your MPG to drop especially if you drive shorter distances. It takes more fuel for a cold engine to run than a warm one & your engine management system works at peak performance after the oxygen sensors (in the exhaust) have reached temp....

210,105

Also with the cold air, your tires pressure will drop at least 5psi or more. Make sure to check them, they might be low.

1 out of 1 people think this is helpful.
17,625

Your spark plugs need changed. Once they get a larger gap it takes more gas to fire the cylinder. Dirty air filter and tire pressure will cause it too.

This has been going on since it was warm out. Tire pressure is fine. It is not that cold here. My spark plugs were checked and they are fine. A complete OEM diagnostics has been run and nothing can be determined that could be causing the drastic fuel consumption. It is getting around 11 to 12 mpg compared to 16+ in the city. Road driving hasn't changed that much.

30

Do you have 'check engine' or 'tailpipe' emissions testing in your state?

30

Also how long are you driving for and what are the air temps? Has low fuel economy persisted while experimenting with other fuel companies?

17,625

Winter gas. They put additives in it and it kills everyones fuel mileage.

40

I've been having the same issue. Dropped from 17 mpg to 10 mpg and I can't figure out why. No codes and no check engine light. Tire pressure is good. I've replaced the spark plugs, fuel filter, fuel pressure regulator, and o2 censor. Tried running 6 tanks of non ethonol fuel too. Nothing seems to help. I'm at a complete loss as to why the milage took such a hit. And it's getting 10 mpg all year long..winter, spring, summer, fall.

4 out of 4 people think this is helpful.
10

2005 Trailblaser with the same problem, runs and idles fine but millage took a dump. I used to get over 300 miles a tank now I get less than 150 miles a tank? Someone has to know what is going on?

1 out of 1 people think this is helpful.

I see no answers here and this hasn't been helpful at all... I'm getting hardly 10 mpg... Can anyone explain what's going on? I had a friend that had a similar size SUV of another maker (Pacifica) experiencing the same horrible gas mileage everyone was thinking transmission, tune-up whatever; however, they vehicle showed a code for the catalytic converter during the complete computer diagnostic test … Sure enough order the item had it installed ..WHAM-O… problem solved.. Does anyone know what solves this problem for the 2003 Trail Blazer 4.2ltr? Please help a single mother three kids and things are not going well and need the help seriously.

Your Answer

Add photo

Related Questions

  • Speedometer not working.... 17 answers

    I have a 2003 Trailblazer EXT LT. I bought this vehicle used with a very limited warranty. I have encountered a problem with the speedometer not working properly or not working at all in some cases....

    Chevrolet TrailBlazer EXT

    -

    Maintenance & Repair

  • why is my car burning so much gas 1 answer

    car is burning a lot of gas

    2002 BMW 3 Series 325xi

    -

    Maintenance & Repair

  • 2004 chevy trailblazer shuts off 16 answers

    my car just turns off, when stopped in drive it idles good then all of a sudden there is a tremor and the rpm drops and dies, it starts right back up.

    2004 Chevrolet TrailBlazer LS

    -

    Maintenance & Repair

  • Burning oil 7 answers

    I have a 2006 equinox and it burns oil really bad. It also has a little rattling noise in the motor but only when I step on the gas pedal. Does anyone have and idea why it would have that rattle on...

    2006 Chevrolet Equinox LT

    -

    Maintenance & Repair

  • trailblazers 2 answers

    do the 2008 models come in V6. And which one is the luxury edition

    2008 Chevrolet TrailBlazer

    -

    General

Shortcuts

Search Maintenance & Repair Questions

Maintenance & Repair Experts

#1 Tom Demyan
Tom Demyan
Reputation 150,130
#2 FordNut
FordNut
Reputation 103,050
#3 dandyoun
dandyoun
Reputation 84,020
View All