2003 GMC Sonoma 4.3 wont start

Asked by Wayne Sep 16, 2019 at 12:16 PM about the 2003 GMC Sonoma SLS Long Cab 2WD

Question type: Maintenance & Repair

Died driving at about 25mph a week and a
half ago. Battery was bad, replaced, cranks,
won’t start. Changed plugs, wires, ignition
coil, module, new spider assembly, new cam
shaft sensor, distributor cap (had white on
posts) and rotor, have fuel pressure,
compression, spark, but won’t start.
Yesterday working on it, saw this while
cranking, got a video of it, I just don’t know.
Here is a link to the video of the
smoke/mist...https://drive.google.com/file/d/
1TYrNKtyiK7-
1jG1Jnk3JzNBtBKVNyrRt/view?
usp=drivesdk

3 Answers
1,930

Carpentar answered about a year ago

Damn you went the expensive route on this puppy. Check fuel pressure if zero check relay on fuse box under hood.first check ecm2 fuse runs the fuel pump relay via ecm. Check guages light will illuminate if engine dies while driving or senses no battery input, or any of the gauges w high or very low voltage via the hs canbus(serial data terminal connection. Turn key on stick head out door and listen for buzzing or whiring sound no sound most likely pump. Hope that helps. 03 s-10 4.3 4x4 owner

Mark helpful
1,930

Carpentar answered about a year ago

Spark fuel compression pressure on fuel must ne 40psi at input line or it will not start. Have you done a compression test?

Mark helpful

Your Answer:

Related Questions

  • 2003 GMC Sonoma 4.3 wont start 3 Answers

    Died driving at about 25mph a week and a half ago. Battery was bad, replaced, cranks, won’t start. Changed plugs, wires, ignition coil, module, new spider assembly, new cam shaft sensor, distribut...

    2003 GMC Sonoma SLS Long Cab 2WD

    -

    Maintenance & Repair

  • Why wont my 1997 GMC Sonoma start. 6 Answers

    Hi my 1997 GMC sonoma has been giving me problems. I was driving one day and then the engine shut off completely. The battery however was working fine and all lights were turning on. I got it towed ho...

    1997 GMC Sonoma 2 Dr SLS Sport 4WD Standard Cab LB

    -

    Maintenance & Repair

  • why wont my gmc start? 2 Answers

    My gmc sonoma wont start new battery new starter spark plugs

    1998 GMC Sonoma 2 Dr SLS Sport Standard Cab LB

    -

    Maintenance & Repair

  • 4.3 V6 2003 GMC Sonoma 1 Answer

    Truck was running fine the low fuel light was on and out the blue it acted like it was runing out of gas put Gas in it and now it well idle but as soon as you open the throttle it cuts out. You can...

    2003 GMC Sonoma SL 2WD

    -

    Maintenance & Repair

  • 1998 GMC Sonoma won't start 4 Answers

    We've replaced the starter, relay and the battery and alternator are new. Fuel pump is good. No clicking, all lights come on. Does not dim when turning key. Just won't start. What can I check next...

    1998 GMC Sonoma

    -

    Maintenance & Repair

Sonoma

Looking for a Used Sonoma in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search GMC Sonoma Questions

CarGurus Experts

  • #1
    parkle
    Reputation
    1,090
  • #2
    Mike Bonnell
    Reputation
    660
  • #3
    James Mayfield
    Reputation
    410
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet S-10
2 listings starting at $12,975
Used GMC Canyon
31 Great Deals out of 1,264 listings starting at $5,995

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.