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  • #1

    More problems.....

    I went on a break in cruise for about a half hour tonight. I did some spirited driving (under 5500 rpm) to help my PCM relearn. The car is just not pulling like it should..... I noticed a weird hot smell almost like plastic burning. I figured it was the engine working itself in again. It kept up though. I got it back in the driveway and popped the hood (now its almost dark out) and I SEE THE NUMBER 8 CYLINDER HEADER PRIMARY GLOWING RED!!

    Is this cylinder starving for fuel? DO you think I smoked a piston or a valve? I havent pulled the plug yet as it was too hot, but I am almost afraid to look
    96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
    11.6 @ 123mph (1.6 60' - getting there )
    Tags: None
  • #2
    The plug looks a little lean, but no more than the others. A burnt exhaust valve would cause this huh?
    96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
    11.6 @ 123mph (1.6 60' - getting there )

    Comment

    • #3
      I have seen this from the header flange to the block leaking in extra air.
      2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

      1995 Z28, many mods, SOLD

      A proud member of the "F-Body Dirty Dozen"

      Comment

      • #4
        Originally posted by Jeff 95 Z28
        I have seen this from the header flange to the block leaking in extra air.
        Are you talking about just a leaking header gasket?
        96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
        11.6 @ 123mph (1.6 60' - getting there )

        Comment

        • #5
          yes
          2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

          1995 Z28, many mods, SOLD

          A proud member of the "F-Body Dirty Dozen"

          Comment

          • #6
            Had you just been spraying? My rear 4 primaries would glow for a few minutes sometimes after a few n20 runs! It is common for the rear 4 and especially the rear 2 ( #8, #7) to lean out on nitrous motors delivering the juice through the TB.

            Could be a tosted #8 exhaust valve. Listen carefully to the #8 while the motor is running. If you have roasted the #8 exhaust valve seat or burnt the valve itself, you should be able to hear an unusual loud ticking noise through the #8 primary.

            Comment

            • #7
              Originally posted by fastTA
              Had you just been spraying? My rear 4 primaries would glow for a few minutes sometimes after a few n20 runs! It is common for the rear 4 and especially the rear 2 ( #8, #7) to lean out on nitrous motors delivering the juice through the TB.

              Could be a tosted #8 exhaust valve. Listen carefully to the #8 while the motor is running. If you have roasted the #8 exhaust valve seat or burnt the valve itself, you should be able to hear an unusual loud ticking noise through the #8 primary.
              No, i dont even have the juice hooked up, as I was planning on taking it easy until the new bottom end seated. I will listen for the ticking and I will also do a compression / leakdown test on it today. I have a feeling its the valve......and it was there before I did the lower end. It was sluggish before. Of course its gotta be the number 8 cyl. .
              96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
              11.6 @ 123mph (1.6 60' - getting there )

              Comment

              • #8
                The compression test didnt go so well. I got 167 PSI in the #8 cylinder. I thought this was pretty good until I checked another cylinder for reference - 212 PSI. So, I am lacking 45 PSI of compression.

                The leakdown went the same. I checked # 8 at 15% leakage. I checked another cylinder for reference and it was at about 5% leakage.

                So, what are normal numbers for an engine like mine? To me, it seems like an exhaust valve issue.....anybody want to lend me their magic wand so I dont have to pull the head??
                96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
                11.6 @ 123mph (1.6 60' - getting there )

                Comment

                • #9
                  Before you pull the head, pull off the valve cover and just make sure there is nothing wrong with the rocker arm, retainer, valve locks, and spring on #8. Could be a bad spring.

                  Comment

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