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Thread: Random missfire

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  1. #1
    Join Date
    Jul 2009
    Posts
    532

    Random missfire

    Truck has been throwing the random missfire code here lately. I've done had problems and put on new plug wires off an NNBS. Solved the prob. What all else could this be? And it has also been going dead on me here lately when i come to a stop....
    04 Silverado Z-71 Extended Cab

    Magnaflow, 10.4 TV 50 wires, tr-55ix, Synthetics, HID's, JL audio, 33.5", leveling kit, tuned, CAI, vette servo, cam, valve job, pacesetter. 9.3@77.5 and 14.5@93.4

    06 2wd

    custom cam, tune, 3.73's, servo, HID's, 10.4mm wires, long-tubes, CAI, magnaflow, 2.5" shackles, Circle-D 3200, UD, JL Audio 4.1, Alpine 5ch

  2. #2
    Join Date
    Aug 2008
    Location
    Alabama
    Posts
    35
    i'd sell it
    2007 Silverado. Mostly stock...

  3. #3
    Join Date
    Apr 2008
    Location
    newburgh, NY
    Posts
    512
    Did you change the plugs?
    Step 1. crus at it.
    Step 2. get a hammer.
    Step 3. torch it.

  4. #4
    Join Date
    Jul 2009
    Posts
    532
    It's got E3's. Not impressed. Done replaced plug wires... could it be an O2 sensor?
    04 Silverado Z-71 Extended Cab

    Magnaflow, 10.4 TV 50 wires, tr-55ix, Synthetics, HID's, JL audio, 33.5", leveling kit, tuned, CAI, vette servo, cam, valve job, pacesetter. 9.3@77.5 and 14.5@93.4

    06 2wd

    custom cam, tune, 3.73's, servo, HID's, 10.4mm wires, long-tubes, CAI, magnaflow, 2.5" shackles, Circle-D 3200, UD, JL Audio 4.1, Alpine 5ch

  5. #5
    Join Date
    May 2009
    Location
    Plainfield, IL
    Posts
    2,036
    could be injectors (tho unlikely) fuel filter, pump going bad (check pressure) intake gasket leak, or some sensor.
    blown transmissions are about as useful as 97% of the guys on this forum

  6. #6
    Join Date
    Jul 2009
    Posts
    532
    Hmmm.. yea i guess any of those things could cause a little disturbance.
    Them plugs burn up fast tho. And some people say if you hit the rev limiter it'll foul the plugs.
    04 Silverado Z-71 Extended Cab

    Magnaflow, 10.4 TV 50 wires, tr-55ix, Synthetics, HID's, JL audio, 33.5", leveling kit, tuned, CAI, vette servo, cam, valve job, pacesetter. 9.3@77.5 and 14.5@93.4

    06 2wd

    custom cam, tune, 3.73's, servo, HID's, 10.4mm wires, long-tubes, CAI, magnaflow, 2.5" shackles, Circle-D 3200, UD, JL Audio 4.1, Alpine 5ch

  7. #7
    Join Date
    May 2008
    Location
    Crowder, OK
    Posts
    8,005
    Did you crack the porcelain on a plug?

    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


  8. #8
    Join Date
    May 2009
    Location
    Plainfield, IL
    Posts
    2,036
    1 plug SHOULD give a misfire on 1 cylinder....random cylinder USUALLY means more then 2. I'd say could even be a 02, but then you should have a bank 1 or 2 rich/lean issue.

    Throw a set of cheap plugs in it and see if it goes away... i haven't met anyone actually running e3's yet. i'm a ac-delco platinum/iridium guy myself. 100k miles no problems.
    blown transmissions are about as useful as 97% of the guys on this forum

  9. #9
    Join Date
    Jul 2009
    Posts
    532
    Yea me too. just had a sale on them so i thought i'd give them a try.
    Another thing is the truck will randomly die on me when i come to a stop.
    04 Silverado Z-71 Extended Cab

    Magnaflow, 10.4 TV 50 wires, tr-55ix, Synthetics, HID's, JL audio, 33.5", leveling kit, tuned, CAI, vette servo, cam, valve job, pacesetter. 9.3@77.5 and 14.5@93.4

    06 2wd

    custom cam, tune, 3.73's, servo, HID's, 10.4mm wires, long-tubes, CAI, magnaflow, 2.5" shackles, Circle-D 3200, UD, JL Audio 4.1, Alpine 5ch

  10. #10
    Join Date
    Feb 2007
    Location
    Fort Worth
    Posts
    9,578
    Could be an 02 issue. Have the CEL scanned and see which Bank is having the issues...

    2000 ECSB 6.0L
    TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's

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