Page 1 of 3 123 LastLast
Results 1 to 20 of 43

Help! Loud tick / pop only when #1 cylinder fires...

This is a discussion on Help! Loud tick / pop only when #1 cylinder fires... within the General Help forums, part of the LSx Technical Help Section category; I've had a loud tick, really more of a "pop" develop after a trip to the track. I don't think ...

  1. #1
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Help! Loud tick / pop only when #1 cylinder fires...

    I've had a loud tick, really more of a "pop" develop after a trip to the track. I don't think that it is metal on metal, sounds almost electrical. I have isolated it to the #1 cylinder, and what is interesting, it is completely ON or OFF depending on whether the cylinder is firing... i.e. when plug wire is on, POP POP POP, when plug wire is off... no noise... or at least not enough to detect.

    What I have done so far...
    1. change plug on #1 cylinder
    2. ensure plug is fully and properly threaded
    3. swap plug wires
    4. swap coil packs


    None of the above made a difference. Still ON / OFF if cylinder was firing or not.

    Then I checked the header bolts to ensure they were tight, no issues there, headers on tight.

    I don't think its an arcing issue because swapping plug wires doesn't help.

    Then I held my breath and pulled the valve cover - fortunately didn't see any metal or evidence of damage and there was no play in the rockers, push rods, etc.

    Only thing I haven't done is swap injectors... but I don't have much confidence that's the problem.

    Engine is an L92 bored/stroked to 427, TFS 235 heads, cammed, kooks headers, FAST 92 intake.

    Help... anyone? What should I check next? If it is valvetrain or bottom end damage wouldn't it still be loud with the cylinder not firing?

  2. #2
    Member 20ws6speed01's Avatar
    Join Date
    Jun 2009
    Location
    Winston,OR
    Posts
    272

    blue
    2001 WS6

    with nosie like that I shut down each cyl till the noise changes & thats ur cyl...because when u take away the firing pressure on the piston the sound will change..could be bottom end....

  3. #3
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    check the compression on 1 and see what it shows

  4. #4
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Quote Originally Posted by 20ws6speed01 View Post
    with nosie like that I shut down each cyl till the noise changes & thats ur cyl...because when u take away the firing pressure on the piston the sound will change..could be bottom end....
    I have isolated it to the #1 cylinder, I'm sure of that. I threw a rod bearing on a difference motor a few years ago - definitely a different sound than what I have now.

    Quote Originally Posted by 0rion View Post
    check the compression on 1 and see what it shows
    Did that, forgot to mention. I think #1 was 170 and #2 was 160, so compression seemed fine.

  5. #5
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Just swapped injectors... noise is still there. It goes away at higher rpms... but is very loud at idle and < 2,000 rpms or so.

    If a lifter is stuck would the noise almost completely go away if the cylinder isn't firing... or would it still be present? Noise seems to be coming from under the intake and injectors so I'm wondering if it could be a lifter.

  6. #6
    Member 20ws6speed01's Avatar
    Join Date
    Jun 2009
    Location
    Winston,OR
    Posts
    272

    blue
    2001 WS6

    wrist-pin???...

  7. #7
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    Did you run the car to redline while at the track?

  8. #8
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    I know some techs use soapy water in a spray bottle to spray on the wires to see if there is any arcing.

  9. #9
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Quote Originally Posted by cammed goat View Post
    Did you run the car to redline while at the track?
    Yes, 6,500 rpms on 3 passes. But engine was built by Erik Koenig and has less than 1,500 miles on it. Scat crank & rods, custom weisco pistons, ARP rod bolts, etc. That RPM shouldn't stress it too badly...

  10. #10
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Quote Originally Posted by cammed goat View Post
    I know some techs use soapy water in a spray bottle to spray on the wires to see if there is any arcing.
    How exactly does that work? Would it be possible to have an arcing situation that isn't dependent on solely the plug wires because I have swapped the #1 and #2 cylinder wires without luck... thanks.

  11. #11
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    I think the suds make the spark brighter to see if there are any breaks in the wire insulation if I recall.

  12. #12
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    ttt...

    Is there any way to diagnose lifter or pushrod damage without pulling the head? I pulled the valve cover didn't see any metal shavings, no obvious play in the springs, rockers, etc.

    Also, would minor valvetrain damage go away with some rpms? My noise is present at idle and low rpms... but goes away with some rpms.

  13. #13
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    I think you have to pull the pushrods to see if they are bent. Others here have posted here about how to go about removing the pushrods to check for bent ones.

  14. #14
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Quote Originally Posted by cammed goat View Post
    I think you have to pull the pushrods to see if they are bent. Others here have posted here about how to go about removing the pushrods to check for bent ones.
    Thanks... that's the next step for me...

  15. #15
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    OK, removed the valve cover & yella terra's on cylinder #1. Pulled the 2 push rods and rolled them on granite counter top, rolled straight and true, I don't think its a bent push rod issue.

  16. #16
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    OK. When you pulled the plug on cylinder #1, were there any shavings on the plug? Like as if the threads had pulled out of the head? Also, check the harness to the coil on cylinder #1 to see if there is sufficient current going to that coil. There could be a chafed wire somewhere.

  17. #17
    1000+ HP member SteveZ28's Avatar
    Join Date
    Oct 2005
    Location
    Far from God's country
    Age
    42
    Posts
    36
    2002 Camaro Z28

    Quote Originally Posted by cammed goat View Post
    OK. When you pulled the plug on cylinder #1, were there any shavings on the plug? Like as if the threads had pulled out of the head? Also, check the harness to the coil on cylinder #1 to see if there is sufficient current going to that coil. There could be a chafed wire somewhere.
    No shavings on the plug that I remember, but I'll check again.

    I'll check the harness... thanks for the continued help in troubleshooting.

  18. #18
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    If there are no shavings, and the plug is snug in the head, then I am thinking there is a short somewhere in that harness going to cylinder #1 coil.

  19. #19
    Did you inspect the springs when the valve cover was off? Look them over thoroughly as a broken spring can sometimes be difficult to see when installed.

  20. #20
    1BADCHEVY bdub2145's Avatar
    Join Date
    Oct 2010
    Location
    Gilbert ,Arizona
    Posts
    78

    White
    2008 Chevy Silverado 4x4

    i had a broken spring on an 02 firehawk of my buddies and it missed bad and backfired . doesn't really sound like a broken spring but maybe. if you pull the plug wire at the coil it should arc out of the coil if it is firing..

Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Tick master cylinder
    By johnfin in forum Firebird / WS6
    Replies: 30
    Last Post: 08-30-2012, 06:18 AM
  2. everyone should get a Tick master cylinder
    By eatin mustangs in forum Manual Transmission
    Replies: 7
    Last Post: 05-27-2012, 09:55 AM
  3. Just installed the tick master cylinder
    By red00bird in forum Firebird / WS6
    Replies: 8
    Last Post: 08-11-2011, 03:41 PM
  4. Help: Tick Master Cylinder
    By Hacked98WS6 in forum Manual Transmission
    Replies: 2
    Last Post: 11-24-2010, 06:48 PM
  5. Question: Tick master cylinder?
    By 97ramair in forum General Help
    Replies: 4
    Last Post: 04-27-2010, 12:49 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
  •