Page 2 of 2 FirstFirst 12
Results 21 to 40 of 40

P0300 code on 2000 Camaro Z28

This is a discussion on P0300 code on 2000 Camaro Z28 within the General Help forums, part of the LSx Technical Help Section category; Fuel pressure was good starting out just below 60. On the 02 sensors are they RF broadcasting? No wires connected ...

  1. #21
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    Fuel pressure was good starting out just below 60. On the 02 sensors are they RF broadcasting? No wires connected to the flat head brass plug. Water type threads I would guess but did not remove them. If they are feeding information to the ECM then they must be doing it by radio frequency transmission? The smoke only goes away when the engine is shut off then it starts up again just after the 3 minute point. I let the car run a good 10 minutes and the smoke filled up the inside of my 5,000 square foot garage with two 24 inch exhaust fans going. Nope so far smoke does not go away. The missing does go away under acceleration but the smoke is still present.

  2. #22
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    What do you mean by starting out? Did the fuel pressure remain steady at 58psi or thereabouts?
    It's on jackstands.

  3. #23
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,520

    98 Formula
    06 duramax

    can you take a picture of those plugs you're looking at? You can hose the pictures for free at photobucket.com and paste the [img] link here. Yeah....sounds like you have more going on than just condensation. Is this something that just started out of nowhere and are you the original owner of the car?

  4. #24
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    Quote Originally Posted by 0rion View Post
    can you take a picture of those plugs you're looking at? You can hose the pictures for free at photobucket.com and paste the [img] link here. Yeah....sounds like you have more going on than just condensation. Is this something that just started out of nowhere and are you the original owner of the car?
    He says in his original post, or disertation rather lol, that the engine was steam cleaned and this all started after that was done.

  5. #25
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    As best as I could see the meter from my vantage point it stayed above the '60 mark. Dissertation? Yep I am a bit verbose.
    Last edited by captcorvette; 03-11-2015 at 06:41 AM. Reason: Lousy proof reading.

  6. #26
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Your car should have four (4) total oxygen sensors. There are two (2) located before the catalytic converters and two (2) located after the converters. The sensors thread into the exhaust pipe, are a bit larger than a spark plug in size, have a metal body and have 4 wires running to each of them. I was going to post a pic, but Photobucket is acting up right now.

    On some cars, the rear (after cat) sensors may have been removed and plugs installed. This is a common modification as the rear O2 senders simply tell the PCM if the converters are working properly. They have nothing to do with fueling and an adjustment in the tune will keep the SES light from coming on after they have been removed. If you can, please post a pic of your exhaust in the areas indicated above.

  7. #27
    Senior Member JayTA98's Avatar
    Join Date
    Dec 2007
    Location
    Orlando, FL
    Posts
    3,351

    Mean Black
    1998 Trans Am

    Do you guys think the IAC may have something to do with this? It sounds like his issue is mostly at idle. I know if it was bad it will make the car stall which is not his case. I had a frined's firebird once that a bad misfire issue and turned out to be a stuck IAC. Not likely but i seen it before.

    As far as the O2 sensors I'm waiting for pics too. I have seen other cars run without O2 sensors at all. But it was mostly imports and they had a custom tune.

    I have a feeling that there is a sensor that is soaked with water from the steam cleaning since the problem started right after that.

  8. #28
    Senior Member JayTA98's Avatar
    Join Date
    Dec 2007
    Location
    Orlando, FL
    Posts
    3,351

    Mean Black
    1998 Trans Am

    OP here is a pic of an downstream O2 sensor location. There should be another sensor just like that one on the other side of the catalytic converter towards the engine. That will be the upstream O2 sensor. You might have a plug instead of the sensor in the downstream sensor (the same location as in the picture) if it was eliminated. This is for you to get the idea of what you are looking at.
    Last edited by JayTA98; 03-13-2015 at 03:52 PM.

  9. #29
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Exactly - on a stock exhaust setup that is what you should see.

  10. #30
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    Have the photos but from over here I cannot load the photos. Will take more this morning and see if there is some way for me to post the photos but photobucket does not work from here.

  11. #31
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    There are other free image hosting sites. I think Image Shack is one of them. Once you upload the photos to the hosting site, simply copy and paste the [IMG] code into your reply box on this site. A line of code will appear in the reply box and then the photo should appear after you hit the post button.

  12. #32
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    Red face

    Quote Originally Posted by pajeff02 View Post
    There are other free image hosting sites. I think Image Shack is one of them. Once you upload the photos to the hosting site, simply copy and paste the [IMG] code into your reply box on this site. A line of code will appear in the reply box and then the photo should appear after you hit the post button.
    Ok think I managed to circumnavigate the photo bucket issues. I am a notoriously lousy photographer but here is the effort.

    Well that was not successful. It is on photobucket but I cannot copy it to here using any thing I am familiar with. Copy, paste, clipboard etc.. Progress. Did manage to upload one of 49 photos.
    Attached Images Attached Images
    Last edited by captcorvette; 03-14-2015 at 08:01 AM. Reason: Learning

  13. #33
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Ok - that is your driver side cat. The O2 sender that controls fueling is above it.

    In this pic, the stock manifold is obviously the top one - you can see the hole for the O2 sender above the converter.


  14. #34
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    OK great. Thanks. I will look again tomorrow when I open the shop. I even took lousy photos of the scanner readings. Will try to get a bit more proficient with the photobucket and load whatever will help with this problem. Nice headers. Not allowed to put them on cars here without tons of paperwork.IMG_20150314_085651 - Copy.jpg

  15. #35
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    That's too bad. These engines love a nice free flowing exhaust setup.

    If you can post pics of the scanner shots, that may be very helpful. I would like to see what your upstream sensors are doing. Also, your long and short term fuel trim numbers would be helpful. A properly functioning O2 sender will rapidly cycle up and down from about 100 mV to 800 mV or thereabouts. One that seems sluggish, or is essentially stuck above or below 450 mV is a sign of an issue.

  16. #36
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    More info folks. Have put a few miles on the car. Completely cleaned the fuel system to include dropping the tank, cleaning and then put in new gasoline. The car still gets a check engine light but clears when the car is shut down. Then takes the 3 minutes to return. Car runs as well as it ever ran and the only misfire is at idle. Off idle the miss is not there and all is well. Checked fuel pressure and is good all the way up and down the throttle with very little variation. Smoke (white) is only present at idle. Missing is only present at idle. Have taken a new out of the box coil and changed it in turn with the others. Makes no difference at all.

    What can cause this random miss at idle only?

  17. #37
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    A vacuum leak, poor connection at a plug or coil pack, worn spark plugs, faulty ignition wires, dirty MAF...

  18. #38
    Junior Member
    Join Date
    Feb 2015
    Location
    UAE
    Posts
    16

    several
    from 19013 up to 2002

    Plugs are new. Ignition wires are new. MAF cleaned. Would like to have a schematic of vacuum lines and locations to insure I have checked ALL of them but cannot be sure I know where all of them are located. All connections checked and rechecked several times. Will try again to load a photo or two of the scanner info.. Thanks for staying with this problem.

  19. #39
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,511

    Navy Blue Metallic
    98 T/A w/a little mods...

    you'll need to upload into photobucket and copy the URL to post pics on here.

  20. #40
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    When you installed your ignition wires, did you hear/feel two "clicks" at each coil pack?

Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. P0300 misfire code...help:(
    By Lotapwr in forum General Help
    Replies: 7
    Last Post: 05-02-2013, 08:19 PM
  2. Help: P0300 code....I'm running out of things to do
    By boola1341 in forum General Help
    Replies: 9
    Last Post: 05-20-2009, 02:22 PM
  3. Damn P0300 code again
    By Hurley711 in forum General Help
    Replies: 24
    Last Post: 05-14-2009, 05:17 AM
  4. P0300 Code - HELP
    By oldguy in forum GM Trucks
    Replies: 1
    Last Post: 09-05-2007, 06:33 PM
  5. code P0300
    By neverlate in forum External Engine
    Replies: 9
    Last Post: 06-04-2006, 07:58 AM

Bookmarks

Posting Permissions

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