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Thread: NGK BR6's & miss fire

  1. #1
    Join Date
    Aug 2007
    Posts
    754

    NGK BR6's & miss fire

    Ever since switched from TR6's to BR6's I have a miss fire down low 1/4 throttle and clears up in boost. No codes. Sounds like a wrx with exhaust for a minute. Is this normal? BTW it's pretty cold out, I haven't drivin it in warmer weather yet.
    Last edited by EmmerichLSx; 01-29-2011 at 01:54 PM.

  2. #2
    Join Date
    May 2008
    Location
    Crowder, OK
    Posts
    8,005
    What did you switch from? TR6?

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  3. #3
    Join Date
    Aug 2007
    Posts
    754
    Yeah sorry I edited it.

  4. #4
    Join Date
    Aug 2007
    Posts
    754
    P0175 popped up.

  5. #5
    Join Date
    Aug 2007
    Posts
    754
    Cleared the code cleaned the maf. Still misses. Help.

  6. #6
    Join Date
    Aug 2007
    Posts
    754
    Could moisture in my fuel cause this?

  7. #7
    Join Date
    Jan 2008
    Posts
    1,550
    Well I just put a set of br7ef's in mine and arounD 1200-1700 rpm with hardly any throttle min will miss a little. Once it hits 2000 it stops and no problems under throttle

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  8. #8
    Join Date
    Aug 2007
    Posts
    754
    I put a bottle of heet in the tank and threw some other plug wires I had layin around on it and it seems to be doing ok now.

  9. #9
    Join Date
    Sep 2005
    Location
    Austin Tx.
    Posts
    13,138
    I had that when I had my plugs gapped too big. I regapped them a bit tighter and downlow it cleared up that stutter sound
    1951 3100
    1984 C10

  10. #10
    Join Date
    May 2009
    Location
    Plainfield, IL
    Posts
    2,036
    what did you have them gapped at? I'm with ducky on this one. The 'original' gap recommended for our trucks was for a platinum/iridium plug. When going to a copper plug, you typically have to close the gap down. I run around .035 on mine, and they seem to be pretty good. I'm running nitrous over boost, but should be close to the same gap (I would think)
    blown transmissions are about as useful as 97% of the guys on this forum

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