Results 1 to 19 of 19

Need Help... Motor Knocking, Sputtering, Rough Idle

This is a discussion on Need Help... Motor Knocking, Sputtering, Rough Idle within the Internal Engine forums, part of the LSx Technical Help Section category; About a week ago, we got A LOT of rain. I tried to start it a few days after all ...

  1. #1
    Junior Member whiteboy's Avatar
    Join Date
    Nov 2007
    Location
    Yorktown, VA
    Posts
    4

    Red
    2002 Camaro SS

    Angry Need Help... Motor Knocking, Sputtering, Rough Idle

    About a week ago, we got A LOT of rain. I tried to start it a few days after all the rain and holy smokes..... The car started right up but with these symptoms:

    knocking
    sputtering
    idling rough between 400-1200 rpms
    smells like it's running rich
    Its throwing a code(s)

    I hadn't driven her for about a week before all the rain; it was running fine. So where to start... Hoping that maybe I have moisture in the fuel system, I added gum out to it. The idling seemed to be a little bit better, but still very rough. The knocking, sputtering, and the surging idle still remained, but now it will stall out if I don't give it gas.

    I don't wanna drive it b/c it's knocking. I don't have a scanner to read the code....

    So.... Any suggestions/ideas?

  2. #2
    Member zeetwentyeight's Avatar
    Join Date
    Aug 2009
    Location
    A, A
    Age
    27
    Posts
    690

    Red
    1998 Camaro Z28

    get the codes scanned

  3. #3
    Junior Member
    Join Date
    Oct 2009
    Location
    US
    Posts
    40
    2002 Camaro

    Can you see or hear any sparks arcing from the plug wires or coils with it running?

    Its sounds like something got wet. You might needs to swap out the spark plug wires and maybe plugs also if they got too fouled.

  4. #4
    Awaiting Activation
    Join Date
    Oct 2007
    Location
    NC
    Posts
    635

    SOM
    1998 T.A.

    Knocking like something internal in the engine....?

  5. #5
    Senior Member INMY01TA's Avatar
    Join Date
    Jan 2006
    Location
    The great red state of MD.
    Posts
    5,755

    Black
    2001 Trans Am (sold)

    Mods ?

  6. #6
    Junior Member whiteboy's Avatar
    Join Date
    Nov 2007
    Location
    Yorktown, VA
    Posts
    4

    Red
    2002 Camaro SS

    Haven't had time to scan the code(s)....

    Yup, knocking like its something internal (oil is full)

    Haven't seen any arching but will check when it gets dark I'll check it out

    Mods, nothing big, SLP Loudmouth II exhaust, SLP Air Lid, SLP MAF Sensor, K&N Air Filter

    thanks for the replies so far, much appreciated

  7. #7
    O U 8 1 2 Spaz's Avatar
    Join Date
    Nov 1999
    Location
    over here...
    Age
    39
    Posts
    25,692

    []D [] []V[] []D
    1999 trans am

    Quote Originally Posted by whiteboy View Post
    Haven't had time to scan the code(s)....

    Yup, knocking like its something internal (oil is full)

    Haven't seen any arching but will check when it gets dark I'll check it out

    Mods, nothing big, SLP Loudmouth II exhaust, SLP Air Lid, SLP MAF Sensor, K&N Air Filter

    thanks for the replies so far, much appreciated
    when did you install this and do you still have the stocker??? have you tried cleaning the MAF with MAF cleaner??? and have you checked the K&N filter??? it might be water logged or dirty from junk collecting on the oil...

  8. #8
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    From your description I think you are saying the car was sitting while it rained??

    If that's the case, I've heard some really strange horror stories about these cars and sitting in the rain.

    Apparently there have been a few people that have had trouble with the rear hood seal letting water in, which as you know hangs right over the top of the engine. It also drains right over towards the computer () passenger side. Someone here reported the water drained on the intake manifold and somehow slipped passed one of the injector 0-rings filling that cylinder with water.

    It can also get under the intake and play havic with knock sensors. Don't know if this is your situation, but the first thing I'd do is check the code/codes and it will give you a place to start looking.

  9. #9
    Senior Member INMY01TA's Avatar
    Join Date
    Jan 2006
    Location
    The great red state of MD.
    Posts
    5,755

    Black
    2001 Trans Am (sold)

    Quote Originally Posted by whiteboy View Post
    Mods, nothing big, SLP Loudmouth II exhaust, SLP Air Lid, SLP MAF Sensor, K&N Air Filter
    When I had my Granitelli maf years ago my car did what yours is doing when it rained. I'd put the stocker back on.

  10. #10
    Junior Member
    Join Date
    May 2010
    Location
    Denver
    Posts
    30

    pewter
    2000 b4c ls6 Camaro

    Knock sensor 1 or 2. Had that happen to me. Check codes and spark.

  11. #11
    Junior Member whiteboy's Avatar
    Join Date
    Nov 2007
    Location
    Yorktown, VA
    Posts
    4

    Red
    2002 Camaro SS

    Bringin this thread back from the dead...

    Bought a scanner today and this is what it told me:

    P0300 - Random/Multiple Misfires Detected

    Makes sense to me giving the symptoms of the car. Some of you thought it might be one or both of the knock sensors, those of ya that thought so, do you still think so now? Think it fouled the spark plugs too?

    I'm having it towed to a shop on Monday, hopefully it won't cost too much to get fixed....

    BTW, the scanner I used was a Actron CP 9550 PocketScan Plus. Thanks in advance!

  12. #12
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    the knocking is what would concern me the most......is it a knock deep in the motor or does it sound like it's in the valvetrain? I'm not going to scare you by telling you what it sounds like is going on because from here I honestly don't know but the knocking definitely isn't a good sign.

  13. #13
    Junior Member
    Join Date
    May 2010
    Location
    Denver
    Posts
    30

    pewter
    2000 b4c ls6 Camaro

    Ok over the last few months trying everything i just started moving coil packs around and would be ok for a week. wires spark plug are new knocks are new so one of three things? bad spark? bad ground? or just have a tune on the car they will tell u more on wat u need, [plus im running a full ls6 swap so for me it could be a tune?

  14. #14
    Junior Member whiteboy's Avatar
    Join Date
    Nov 2007
    Location
    Yorktown, VA
    Posts
    4

    Red
    2002 Camaro SS

    got the camaro back from the shop.... blown motor.... there is a crack on the passenger side of the block.... it f'n kills me because it ran perfectly fine before all that damn rain.....

    ts either try to sell the car now or save up for a new motor.... thoughts?

  15. #15
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    Quote Originally Posted by whiteboy View Post
    got the camaro back from the shop.... blown motor.... there is a crack on the passenger side of the block.... it f'n kills me because it ran perfectly fine before all that damn rain.....

    ts either try to sell the car now or save up for a new motor.... thoughts?
    what I was afraid of. The cowl seal has been known to let water pool on the intake and it leaks down through an injector seal and gets in a cylinder. You go to crank it and that's all she wrote.

  16. #16
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    motor would be cheaper than a car but it depends on what works for you best. Doesn't sound like your a DIY guy so you'd have to pay for the install which would drive the price up considerably.

  17. #17
    Senior Member JayTA98's Avatar
    Join Date
    Dec 2007
    Location
    Orlando, FL
    Posts
    3,351

    Mean Black
    1998 Trans Am

    Quote Originally Posted by 0rion View Post
    what I was afraid of. The cowl seal has been known to let water pool on the intake and it leaks down through an injector seal and gets in a cylinder. You go to crank it and that's all she wrote.
    Anyway to avoid this? New weatherstripping or something?

  18. #18
    Member ultra_badass's Avatar
    Join Date
    Mar 2007
    Location
    Corpus Christi
    Posts
    257

    navy blue matallic
    2000 WS6 trans am M6

    happend.. to me ram air is bad about that.. best way not to have it happen dont drive in the rain. or replace the moter with a lsx moter and no more worries

  19. #19
    Member Speed_kills_WS6's Avatar
    Join Date
    Feb 2008
    Location
    Anderson, SC
    Age
    37
    Posts
    403

    Black
    2002 TA WS6 M6

    Read the thread again. He WASN'T driving in the rain. It was simply sitting in the rain. The best fix is a garage to park in.


Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Help: Rough idle/motor dying since adding 242R cam
    By thomasterrible in forum General Help
    Replies: 2
    Last Post: 02-02-2014, 07:35 AM
  2. Rough Idle
    By thacher2189 in forum LT1
    Replies: 3
    Last Post: 02-19-2012, 03:04 PM
  3. Help: intermittant rough idle, off idle hesitation
    By Matto4785 in forum General Help
    Replies: 1
    Last Post: 09-21-2009, 06:12 AM
  4. rough idle
    By sstud in forum General Help
    Replies: 5
    Last Post: 05-29-2007, 02:16 PM
  5. Rough Idle
    By MSz28 in forum General Help
    Replies: 19
    Last Post: 04-23-2007, 12:48 PM

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
  •