stft at99.2%,p0300 code,changed 2 after cat sencers checked for air leaks-none,checked fuel pressure,new pluges&wires,both cats are hotter on outputs

Asked by deruyter007 Jan 20, 2015 at 01:08 PM about the Chevrolet Silverado 2500HD

Question type: Maintenance & Repair

code only comes on while on the move-off atslow or stop.changed maf,plugs&wires,b1-s2&b2-s2 have been changed.looked for air leaks atpcv...cleaned throttle

3 Answers
4,725

Josh answered 9 years ago

Did you Check Compression. Checked for Shorted or Opened Circuits on your Fuel System and Ignition System.

Mark helpful
4,725

Josh answered 9 years ago

Make sure you run some fuel injector cleaner just in case the injectors are clogged!

Mark helpful

Your Answer:

Related Questions

  • stft at99.2%,p0300 code,changed 2 after cat sencers checked for air leaks-none,checked fuel pressure,new pluges&wires,both cats are hotter on outputs 3 Answers

    code only comes on while on the move-off atslow or stop.changed maf,plugs&wires,b1-s2&b2-s2 have been changed.looked for air leaks atpcv...cleaned throttle

    Chevrolet Silverado 2500HD

    -

    Maintenance & Repair

  • p0172,p0175,p0300 5 Answers

    help.......... all new parts , mass air flow sensor, manifold absolute pressure sensor,knock sensor and harness ,camshaft sensor, camshaft piston sensor ,fuel injectors and rail, plugs and wires,co...

    2005 Chevrolet Silverado 2500HD Work Truck Crew Cab LB 4WD

    -

    Maintenance & Repair

  • Oil Pressure 1 Answer

    I have a 99 Silverado 2500 LS 6.0L. I was driving down the road and oil pressure went to 0. I immediately pulled over and the truck started making loud noise. Lifter noise(loudest on passenger si...

    1999 Chevrolet Silverado 2500HD LS Extended Cab LB RWD

    -

    Maintenance & Repair

  • WHY WILL THE CODE NOT CLEAR 3 Answers

    I CHANGED THE O2 SENSOR HAD ON BOTH BANKS WENT HAVE CODE CLEAR BUT IT WILL NOT CLEAR WHAT CAN IT BE THANKS

    2006 Chevrolet Silverado 2500HD LS Crew Cab 4WD

    -

    Maintenance & Repair

  • on cold start(25)low oil presure warning for about 2 seconds untill guage gets to 20psi 4 Answers

    slowly warms to normal (40psi) Using gtx 5-30 and A/C Delco filter. Why low oil presure on startup?

    2003 Chevrolet Silverado 2500HD 2 Dr LS 4WD Standard Cab LB HD

    -

    Maintenance & Repair

Silverado 2500HD

Looking for a Used Silverado 2500HD in your area?

CarGurus has 1,279 nationwide Silverado 2500HD listings starting at $9,990.

Postal Code:

Shortcuts

Search Chevrolet Silverado 2500HD Questions

CarGurus Experts

  • #1
    GuruXPQGJ
    Reputation
    1,430
  • #2
    Reelin68
    Reputation
    1,200
  • #3
    Steven Loeffler
    Reputation
    1,160
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 2500HD
13 Great Deals out of 1,617 listings starting at $10,800
Used Chevrolet Silverado 1500
195 Great Deals out of 5,967 listings starting at $2,975
Used Ford F-250 Super Duty
24 Great Deals out of 1,201 listings starting at $8,995
Used RAM 2500
55 Great Deals out of 2,192 listings starting at $14,962
Used Chevrolet Silverado 3500HD
10 Great Deals out of 891 listings starting at $19,495
Used GMC Sierra 1500
143 Great Deals out of 7,206 listings starting at $3,950
Used Dodge RAM 2500
24 listings starting at $9,975
Used Ford F-150
321 Great Deals out of 15,103 listings starting at $1,712
Used Ford F-250
6 listings
Used Ford F-350 Super Duty
35 Great Deals out of 2,591 listings starting at $8,888
Used GMC Sierra 3500HD
17 Great Deals out of 1,391 listings starting at $11,950
Used Toyota Tundra
34 Great Deals out of 1,190 listings starting at $8,500
Used RAM 1500
457 Great Deals out of 15,784 listings starting at $5,000
Used Chevrolet Silverado 3500
4 listings
Used Chevrolet Tahoe
20 Great Deals out of 904 listings starting at $11,900

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.