Page 5 of 5 FirstFirst 12345
Results 81 to 92 of 92

Cylinder 3 Misfire after spark plug change.

This is a discussion on Cylinder 3 Misfire after spark plug change. within the General Help forums, part of the LSx Technical Help Section category; good news, after the tape, and an ECU reset, I seem to have my power back, although at idle it ...

  1. #81
    Member first01SS's Avatar
    Join Date
    May 2008
    Location
    Dallas, TX
    Age
    37
    Posts
    184

    Pewter
    2001 Camaro Z28, Bolt-Ons

    good news, after the tape, and an ECU reset, I seem to have my power back, although at idle it still misses. I also did check MAF; cleaned it, but it made no change. The tap-tap noise is all but gone. I'm going to try more tape. If it is, in fact the plug hole causing this issue, I'm going to solve the problem by buying a set of Patriot heads.

  2. #82
    Member first01SS's Avatar
    Join Date
    May 2008
    Location
    Dallas, TX
    Age
    37
    Posts
    184

    Pewter
    2001 Camaro Z28, Bolt-Ons

    I'm driving it as we speak (posting from my iPhone), yes I replaced all plugs with old ones in the same order they came out. There was no change.

  3. #83
    Member
    Join Date
    Oct 2005
    Location
    San Antonio
    Age
    46
    Posts
    289

    Silver & Black
    99 Camaro SS

    It would be weird and crazy coincidence but I'd swap injectors around. At this point I'd want to eliminate it...and the injectors are pretty easy.

  4. #84
    Member first01SS's Avatar
    Join Date
    May 2008
    Location
    Dallas, TX
    Age
    37
    Posts
    184

    Pewter
    2001 Camaro Z28, Bolt-Ons

    I have a strong feeling that i've cross threaded the hole, and the spark plug isn't seating all the way down, causing the misfire. The teflon tape proved the lack of seal, and helped resolve some of the loss of compression, and since its firing at WOT, it would be safe to assume, its not a fuel delivery problem. (or would it?) Can i re-thread the hole? If so, what will i need? It's only about 125-150psi in the chamber, so i think the teflon will hold until i can adequately resolve the issue.. right?
    Last edited by first01SS; 01-21-2009 at 08:18 AM.

  5. #85
    Member
    Join Date
    Oct 2005
    Location
    San Antonio
    Age
    46
    Posts
    289

    Silver & Black
    99 Camaro SS

    Quote Originally Posted by first01SS View Post
    I have a strong feeling that i've cross threaded the hole, and the spark plug isn't seating all the way down, causing the misfire. The teflon tape proved the lack of seal, and helped resolve some of the loss of compression, and since its firing at WOT, it would be safe to assume, its not a fuel delivery problem. (or would it?) Can i re-thread the hole? If so, what will i need? It's only about 125-150psi in the chamber, so i think the teflon will hold until i can adequately resolve the issue.. right?
    I still wonder if there is still a remnant miss. Crap, never mind, you'd have the miss from shallow plug penetration in the cylinder.

    Teflon, it depends, mostly dealt with in the past in wiring. (There are grades and I have had tp spec it for UL approval in high heat areas) But I've put 500 degrees on in telfon insulation and not touched it. Try to get "high temp" or try to find one you can Google a data sheet for that brand.

    I wouldn't play around long at all, right to a machinist, it is worth doing right to get the threads repaired (start with removing gall.)

  6. #86
    Member first01SS's Avatar
    Join Date
    May 2008
    Location
    Dallas, TX
    Age
    37
    Posts
    184

    Pewter
    2001 Camaro Z28, Bolt-Ons

    I'm using high temp tape (-47F to +850F). I just need to isolate the issue to make absolutely sure that this is it. Again, if it decide to dissemble the engine, i'm going to just replace the heads with stage III heads from patriot, and use my stock cam, and valve train, until i make a decision on the cam, and do the supporting mods to the drivetrain/valvetrain.

  7. #87
    Member
    Join Date
    Oct 2005
    Location
    San Antonio
    Age
    46
    Posts
    289

    Silver & Black
    99 Camaro SS

    I always try to think of a way to save what I have if I got the whole swap (head here) as a back up. The problem is not getting anything into the cylinder that you can't get out.

    I'd try to clean the threads with an old plug (modified by a dremel, cutting grooves on the traverse like a tap...but also thinning the threads at the start of the groove due to Aluminum, giving more of a spreading effect over cutting). But I wouldn't until I worked a piece of brake line back to some intermediate hoses and then to a shop vac hose. I've used duct tape and many things to do this...you can make on hell of "micro-vacuum" (don't run the shop vac more than 20 seconds at a shot...it will overheat).

    And then that plug would get some loctite.

  8. #88
    Member first01SS's Avatar
    Join Date
    May 2008
    Location
    Dallas, TX
    Age
    37
    Posts
    184

    Pewter
    2001 Camaro Z28, Bolt-Ons

    loctite sounds like "i ain't ever coming out."

  9. #89
    Member
    Join Date
    Oct 2005
    Location
    San Antonio
    Age
    46
    Posts
    289

    Silver & Black
    99 Camaro SS

    You can get it out. Takes more muscle!



    Just on 2 or 3threads.

  10. #90
    Member first01SS's Avatar
    Join Date
    May 2008
    Location
    Dallas, TX
    Age
    37
    Posts
    184

    Pewter
    2001 Camaro Z28, Bolt-Ons

    We're going to have the hole re-tapped and put a Heli-Coil in it. Hopefully, that will solve the problem. It will be several days, however before i get to it. So, I'm going to have to deal with what i've got; the Teflon temporary repair.

  11. #91
    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

    Good to hear the problem has been located.

  12. #92
    Member
    Join Date
    Oct 2005
    Location
    San Antonio
    Age
    46
    Posts
    289

    Silver & Black
    99 Camaro SS

    Quote Originally Posted by first01SS View Post
    We're going to have the hole re-tapped and put a Heli-Coil in it. Hopefully, that will solve the problem. It will be several days, however before i get to it. So, I'm going to have to deal with what i've got; the Teflon temporary repair.
    It should be ok if done right. From then forward don't waste removal and installs of that plug. (Never select that one to check for plug wear or lean/rich running etc.) I'd apply a bit of WD-40 to it for de-installs.

Page 5 of 5 FirstFirst 12345

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Spark Plug change
    By Vince from Shamwow in forum General Help
    Replies: 40
    Last Post: 06-11-2011, 01:10 PM
  2. Question: misfire fixed, spark plug question
    By ls1ws6ben in forum Firebird / WS6
    Replies: 3
    Last Post: 01-26-2011, 04:12 AM
  3. Question: Spark plug change on a V6
    By M-ManLA in forum General Help
    Replies: 13
    Last Post: 04-01-2009, 12:29 AM
  4. Help: random multiple cylinder misfire after plug/wire
    By ggino85 in forum General Help
    Replies: 9
    Last Post: 07-31-2008, 11:29 AM
  5. The #8 cylinder spark plug.....
    By Anwazi in forum External Engine
    Replies: 16
    Last Post: 07-13-2008, 09:51 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
  •