check engine light comes on when down to 1/4 tank and goes off at 3/4 tank. Also Revs very high.

jorf
0

Asked by jorf Dec 13, 2008 at 02:28 PM about the 2003 Chevrolet TrailBlazer LT

Question type: Maintenance & Repair

I have a chevy trailblazer that the check engine light comes on when down to around 1/4 tank of gas and then after refuel goes off when it is 3/4 tank full.  It also revs very high while driving, then it goes back to normal.  Any ideas?

5 Answers

Danny Wang
2,935

given that you mention the high rev while driving and variations in fuel tank levels my guess, but I am not positive, may have to deal with something in the evaporative emission system

1 out of 1 people think this is helpful.
Adam Morgan
4,895

If the light is staying on until you fill back up, then stop by a parts store and get the code read...

SanJoseTJK
0

Replace the fuel level sender in the fuel tank. A common wear out item on many vehicles. Had to do this on my friends 06 trailblazer and my wife's Isuzu Rodeo. True fix.

Bruce Klug
165

make sure your gas cap is tight. If that doesnt work, buy a new one.

Timothy Kirchofer
105

Yes SanJoseTJK is likely right , the fuel level sensor id a vasriable resistor and likely has a worn out section where resistance is lost on the circuit when the fuel level reaches that level the vehicle requires a fuel level check before the vehicle computer (ECM) can run certain diagnostic tests ,when it runs the test and can not get a signal it turns on the check engine light and sets a DTC you need a code reader to be sure but will likley find 1 or more codes set for the fuel system

Your Answer

Add photo

Related Questions

  • TAPPING SOUND FROM UNDER DASHBOARD 4 answers

    SERVICE ENGINE LIGHT COMES ON AFTER FILLING UP ON GAS. REMOVED GAS CAP AND REPLACED WITH NEW ONE. LIGHT CAME BACK ON SO DISCONNECTED BATTERY HOPING IT WOULD RESET. NOW HAVE A TAPPING SOUND FROM UNDER ...

    2004 Chevrolet TrailBlazer LS 4WD

    -

    Maintenance & Repair

  • electrical issues 11 answers

    here's a doozy for anyone who is an electrical genius and can figure out what really ails my truck: Here are the issues: 1) lights have gone out while driving during the night (this has happened 2 t...

    2003 Chevrolet TrailBlazer LS 4WD

    -

    Maintenance & Repair

  • Strange Noise at first acceleration 8 answers

    My 2005 LT sounds like a tractor trailer truck when I first take off even if I let the car sit and warm up for a bit. I don't know how to explain it properly, but some tractor trailers sound like the...

    2005 Chevrolet TrailBlazer LT

    -

    Maintenance & Repair

  • IS MY FAN SEED SUPOSE TO RUN HIGH? 1 answer

    MY CHECK ENGINE LIGHT CAME ON. I TOOK MY TRAILBLAZER TO AUTOZONE A TROUBLE CODE UP SAYING MY FAN SPEED WAS HIGH. I TOOK IT BACK TO THE CAR DEALER WHERE I GOT IT FROM THEY SAY IT IS NORMAL BUT I DON'T ...

    2002 Chevrolet TrailBlazer LS

    -

    Maintenance & Repair

  • 4 x 4 service 1 answer

    When I start my truck my service 4 wheel drive light is on and my truck is in 4 wheel drive high, I hit my 2 wheel high button 15 to 20 times and all the lights go off on my switch an goes into 2...

    2002 Chevrolet Avalanche 4 Dr 1500 4WD Crew Cab SB

    -

    Maintenance & Repair

TrailBlazer
Looking for a Used TrailBlazer in your area?
CarGurus has 4,198 nationwide TrailBlazer listings starting at $2,000.
ZIP:

Search Chevrolet TrailBlazer Questions

Chevrolet TrailBlazer Experts

#1 dandyoun
dandyoun
Reputation 360
#2 lightGear
lightGear
Reputation 210
#2 Tom Demyan
Tom Demyan
Reputation 210
View All

Related Models For Sale

Used Toyota 4Runner"
238 Great Deals out of 9,272 listings starting at $1,995
Used Ford Explorer"
754 Great Deals out of 46,148 listings starting at $1,300
Used Mitsubishi Endeavor"
27 Great Deals out of 559 listings starting at $2,987

Used Cars For Sale

2002 Chevrolet TrailBlazer LT For Sale
42 listings starting at $3,995
2004 Chevrolet TrailBlazer LT For Sale
43 listings starting at $3,950
2005 Chevrolet TrailBlazer LT For Sale
4 Great Deals out of 43 listings starting at $3,000
2006 Chevrolet TrailBlazer LT For Sale
53 listings starting at $3,950