GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 5 of 5
  1. #1

    Default 1998 Chevy 4x4 w/5.7 w/PO300 Code.

    Put New Spark Plugs,wires,disb,rotor. Doesnt Idle Very Good, Iwas Pulling a Camper 2-Weeks Ago Engine Service Light Came On Almost Home An Engine Was not runnig good, scaner Said # 6 Cy Misfired So Put New Plugs Wires Etc Need Help,put scaner back on an said PO300 Code

  2. #2

    Default

    Quote Originally Posted by metal77 View Post
    Put New Spark Plugs,wires,disb,rotor. Doesnt Idle Very Good, Iwas Pulling a Camper 2-Weeks Ago Engine Service Light Came On Almost Home An Engine Was not runnig good, scaner Said # 6 Cy Misfired So Put New Plugs Wires Etc Need Help,put scaner back on an said PO300 Code


    Trouble Code.....P0300.......is a Random Mis-Fire....but it Doesn't tell you Specifically which Cyl(s) is/are Mis-firing, nor why.....

    What Causes a Trouble Code P03
    00.......may mean that one or more of the following has happened:
    • Faulty spark plugs or wires
    • Faulty coil
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Stuck/blocked EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer

    What Brand of Spark Plugs did you installed/go with??...On the items above I would look at the Plugs and Wires first and foremost, as you just installed them.


    Last edited by 99'HEARTBEAT; 10-28-2011 at 01:55 PM. Reason: Added Infor

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

  4. #4
    Legend
    murdog94's Avatar
    Join Date
    Feb 2008
    Location
    Cloquet, Minnesota, United States
    Posts
    8,198
    Blog Entries
    12

    Default

    I would put some decent money that you have a bad Fuel pressure regulator expecially by getting a number6 misfire first. the best way to check is to remove the TB and look into the intake, you should not smell raw fuel and if you do then you have found your issue.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  5. #5

    Default

    I think you may have answered my question. I have a 99 with the same issues. as well as a bank 2 sensor 2 fault.

Similar Threads

  1. Tahoe PO300 Code
    By Jbugg in forum Chevy Truck Talk & GM News
    Replies: 1
    Last: 07-29-2011, 01:00 PM
  2. PO300 and PO161 and bad MPG 1996 K1500 Chevy
    By Dantheman96 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 0
    Last: 05-05-2011, 11:42 AM
  3. Replies: 3
    Last: 12-22-2010, 08:38 AM
  4. 1998 Chevrolet Silverado 5.7 Code p0340 code help
    By campuscop2003 in forum GM Powertrain
    Replies: 3
    Last: 08-06-2010, 10:08 PM
  5. info - misfire on a 2001 chevy tahoe 5.3 code PO300
    By x1078p in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 08-18-2009, 11:47 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •