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Nasty backfire

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  • #16
    Check for vacuum leaks also. You have a complete exhaust on it right?

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    • #17
      Sounds nasty! Good luck, wish i could help.
      sigpic
      If you come across a cobra in the wild, wipe it off and apologize.

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      • #18
        Cylinder 1 on left and cylinder 8 on right in order.
        And this
        sigpic
        1997 Camaro Z28 M6 with stuff done to it.

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        • #19
          1 and 5 are toast. Have you fired it at night to see if you have an arc show under the hood?

          1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
          1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
          1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

          2006 Saab 9-7x 5.3i Daily Driver

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          • #20
            Toast as in fouled out? And no I haven't. I'm making new wires right now and I'm never doing it again.

            These were 1 and 5 spark plugs when I changed them after I had changed them before. 1 on top 5 on bottom. Changed them due to random misfire after I had started and ran the car a few times for a short period of time
            sigpic
            1997 Camaro Z28 M6 with stuff done to it.

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            • #21
              I hate those black autolites, hard to read the fire ring. In the pic above, looks like #1 is fouled again. If it keeps fouling after new wires, try swapping the coil and see if the problem follows.

              1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
              1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
              1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

              2006 Saab 9-7x 5.3i Daily Driver

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              • #22
                I replaced the two coils and used two msd 8.5 wires on them instead of the Taylors.
                Backfired as it was cranking.
                Ran it for about 20 seconds before it backfired again.
                Out of all the times it has done it, it seems to have only done it at idle or as it comes down to idle.
                sigpic
                1997 Camaro Z28 M6 with stuff done to it.

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                • #23
                  If theres a problem with a particular cylinder try swapping the coil /plug / wire to another cylinder 1 at a time and see if the problem follows
                  -Joel
                  1995 Z28 M6 - AI226/234 - autocross ricer
                  1984 Scottsdale K10 - 305/4bbl/4spd


                  WTB List:Midwest Chasis DS Loop

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                  • #24
                    I'm about 90% sure injector 6 and 1 wiring was reversed. Other than that the wiring isn't the issue. Went over it 3 times.

                    I'll try moving the coils around.
                    sigpic
                    1997 Camaro Z28 M6 with stuff done to it.

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                    • #25
                      Fixed it. The coil harnesses were backwards lol.
                      sigpic
                      1997 Camaro Z28 M6 with stuff done to it.

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                      • #26
                        Booyah! We now need an updated video
                        2000 SS Convertible #1414 - Light Pewter 6 Speed

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                        • #27

                          Want to thank everybody for staying positive. Will post vids tomorrow. Sounds fantastic
                          sigpic
                          1997 Camaro Z28 M6 with stuff done to it.

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                          • #28
                            Good work!

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                            • #29
                              Good Job! its always hard to find a mistake that we make ourselves!
                              sigpic
                              1998 Trans Am Convertible A4 - WS6 hood, WS6 air lid, WS6 rims, drilled/slotted rotors.

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                              • #30
                                Originally posted by DanDalessandro View Post

                                Want to thank everybody for staying positive. Will post vids tomorrow. Sounds fantastic
                                Honestly, man, I am impressed you got 'er dun with this little of hassle. You changed a whole lot at once - all those variables quickly raises the risk of issues. You should be proud of yourself for pulling this off on your own!

                                So, Officer Dalessandro will be back in action patrolling Woodward, eh?
                                2000 SS Convertible #1414 - Light Pewter 6 Speed

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