2003 chevy trailblazer 4.2 NEED HELP

Asked by Aharri270 Aug 17, 2022 at 01:42 AM about the 2003 Chevrolet Trailblazer LS RWD

Question type: Maintenance & Repair

I have a 2003 trailblazer 4.2 inland v6 so i bought
the truck and it wasnt running so i put a new
battery on to figure it out. It starts great idles great
go to take off it only runs 15 to 20 and 1 to 2 rpms.
Ive changed the air temp sensor cleaned the trottle
body with the sensor inside it. I even got another
one no change so i changed the map sensor, the
variable timing soleind and plug nothing. So ive
checked the air filter its good the oil is hood added
treatment, new gas with treatment. If i resest the
ecu  it gets up in 2nd gear and about 30 mph. Also
the oil gague either starts at 80 when starting and
push the pedal but dives to 40. So i changed the
acceleration position sensor the pedal and the fuel
pump is getting fuel to tthe motor bc it always
starts and nevers just dies. Anyone got anymore i
ideas

2 Answers
310,265

Gene answered 2 years ago

Exhaust back pressure too high, fuel pump pressure too low, weak compression. What does live data show?

Mark helpful
40,015

beatupchevy answered 2 years ago

Some vehicles are particular about fuel pressure just having it won't do you could have bought a fuel pump gauge with the money you spent on parts you didn't need , Catalytic may be plugged see if there's a healthy blast of exhaust , You may have put new gas in it but you probably didn't purge the lines , The oil pressure sounds normal; . scan for codes even if the light ain't on

Mark helpful

Your Answer:

Related Questions

  • 2003 chevy trailblazer 4.2 NEED HELP 2 Answers

    I have a 2003 trailblazer 4.2 inland v6 so i bought the truck and it wasnt running so i put a new battery on to figure it out. It starts great idles great go to take off it only runs 15 to 20 and 1...

    2003 Chevrolet Trailblazer LS RWD

    -

    Maintenance & Repair

  • 2003 Chevy trailblazer 1 Answer

    Will a 2006 Chevy trailblazer headlight fit a 2003 Chevy trailblazer lt

    2003 Chevrolet Trailblazer LT RWD

    -

    Maintenance & Repair

  • 2003 chevy trailblazer AC 1 Answer

    2003 Chevy Trailblazer 4x4 Vortec 6. has AC when you start but after you stop somewhere or run it for a while then start it back up no AC. Checked it with the Gauge that comes with the AC canister and...

    2003 Chevrolet Trailblazer LS 4WD

    -

    Maintenance & Repair

  • 2003 Chevy Trailblazer will not start 2 Answers

    A 2003 Chevy Trailblazer will not start the driver side door locks and windows do not work the back seat buttons for doorlocks do work but not the windows help

    2003 Chevrolet Trailblazer LT 4WD

    -

    Maintenance & Repair

  • 2003 Chevy Trailblazer 3 Answers

    I'm trying to fix the intake Manifold. I need to find the high & low ports for discharging the AC to work on it. Where are they located?

    2003 Chevrolet Trailblazer LT 4WD

    -

    Maintenance & Repair

Shortcuts

Search Chevrolet Trailblazer Questions

CarGurus Experts

  • #1
    FJ4072
    Reputation
    7,690
  • #2
    Gene Arnett
    Reputation
    3,180
  • #3
    bigdogracer
    Reputation
    2,760
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Blazer
20 Great Deals out of 869 listings starting at $19,499
Used Chevrolet Tahoe
20 Great Deals out of 927 listings starting at $11,900
Used Chevrolet Silverado 1500
202 Great Deals out of 5,916 listings starting at $2,975
Used Jeep Grand Cherokee
109 Great Deals out of 3,211 listings starting at $3,570
Used Toyota RAV4
101 Great Deals out of 2,120 listings starting at $3,888
Used Honda CR-V
100 Great Deals out of 3,893 listings starting at $1,795
Used Ford Explorer
73 Great Deals out of 2,156 listings starting at $2,999
Used Chevrolet Malibu
49 Great Deals out of 1,127 listings starting at $1,295
Used Chevrolet Colorado
21 Great Deals out of 1,538 listings starting at $3,778
Used Ford Escape
128 Great Deals out of 4,719 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.