Seems like a misfire, but it's not.....Help!!!--> - FirebirdV6.com/CamaroV6.com Message Board

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  • #1

    Seems like a misfire, but it's not.....Help!!!-->

    I'm getting what sounds and feels like a misfire from the engine (1999 3.8). It makes a barely audible "thump" from the exhaust, and I can just feel it, and it's instantaneous. Sometimes it will do it multiple times when I'm acclerating, and I can feel the car shuddering from it, and the car is noticeably slower because of it.
    I stopped at a shop today, and checked for codes, but everything, the engine and the transmission, were clean, no misfires, nothing, current, or in history. I can't figure it out. A few suggestions and guesses have been a bad injector, or maybe the cat getting plugged up. It's just started in the last week, and has gotten worse over the last several days. Anybody?? Thanks.

    [ April 03, 2002: Message edited by: Guardsman ]</p>
    Wife and a dog, they both think they\'re Kujo.<br /> <br />1999 3.8 A4 Y87<br />Navy Blue Metallic<br />BFG G-Force KDWS 275/40/17s, <br />WS6 Wheels (17x9)<br />Phoenix Transmissions 2400 Stall Converter<br />FRA, Holley Powershot filter, Whisper Lid, Ported Throttlebody<br />2000 manifolds, Flowmaster, WS6 Tail Pipes, <br />MSD 8.5mm Wires, MSD Coils, Autolite plugs<br />Performance Cryogenics treated rotors<br />1LE Sway Bars and panhard rod, 1LE front springs w/SLP Bilsteins, stock rear springs w/ 3rd Gen Bilsteins, BMR STB, KBDD SFCs, 1LE rear lower control arms, 1LE front lower control arms<p>1968 Chevelle Malibu 327 TH350
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  • #2
    Fuel filter clogged???

    edit: I just noticed that the only check you did was to try and pull codes. If you only pulled codes then how do you know it's not a missfire?? A misfire won't always throw an SES light right away. I would suggest a plug and wire change.

    [ April 03, 2002: Message edited by: John D. ]</p>
    2000 GTP<br />Thrasher CAI, 3.4\" pulley, DHP PCM<br />Member RedLineVSix<br />Best ET-14.02<br />Best Trap-97.15

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    • #3
      I thought any type of misfire would at least throw some kind of code. Crap. It has new plug wires, so it better not be those. Next will be the plugs, if necessary.
      Wife and a dog, they both think they\'re Kujo.<br /> <br />1999 3.8 A4 Y87<br />Navy Blue Metallic<br />BFG G-Force KDWS 275/40/17s, <br />WS6 Wheels (17x9)<br />Phoenix Transmissions 2400 Stall Converter<br />FRA, Holley Powershot filter, Whisper Lid, Ported Throttlebody<br />2000 manifolds, Flowmaster, WS6 Tail Pipes, <br />MSD 8.5mm Wires, MSD Coils, Autolite plugs<br />Performance Cryogenics treated rotors<br />1LE Sway Bars and panhard rod, 1LE front springs w/SLP Bilsteins, stock rear springs w/ 3rd Gen Bilsteins, BMR STB, KBDD SFCs, 1LE rear lower control arms, 1LE front lower control arms<p>1968 Chevelle Malibu 327 TH350

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      • #4
        Random misfires won't throw a code it takes something really extreme like a miss on the same cylinder a bunch of times in a row to make the SES light blink and set a code. it really sounds like plugs or wires, there was a recall on plug wires, but i do not know if it applies to 99's or not, but it is worth checking out.
        Jared W. Drummond<br />jdrummon@vt.edu<br />1997 3.8 Firebird M5<br />-----------------------------------<br />*Flowmaster 80 Series Muffler* *SLP Cold Air Intake* *Zexel-Torsen LSD* *1-Piece DS* *Eibach Pro-Kit* *Removed MAF Screen* *Manual Fan Switch* *Mobil 1 Oils*<br />-----------------------------------<br />*Pioneer Premier DEH-920R Headunit* *Orion Cobalt 6 1/2\'s* *Sub Stealth Box w/ Alpine SWR-1021D* *Kenwood 728S Amp for Sub*

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        • #5
          Well I will go out on a limb ;) and say a bad coil pack. It in only does this after the car warms up right? If so it is a heat soaked coil pack [img]graemlins/thumbsup.gif[/img]
          97 Red Firebird<br />Best N/A 1/4: 13.98<br />Best N/A MPH: 96.13<br />Best Nitrous 1/4: 12.49<br />Best Nitrous MPH: 108.53<p>2001 Pewter Camaro SS <br />GTP Stage II Heads, Pig Cam, Holley Intake, SLP Headers, SLP Lid, Vigalante 3600 Stall Converter, MagnaFlow Cat Back Exhaust, Duel Electric Cut-Outs<br />11.26@121

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          • #6
            Yeah, Redbird is right it could be a coil pack too.
            2000 GTP<br />Thrasher CAI, 3.4\" pulley, DHP PCM<br />Member RedLineVSix<br />Best ET-14.02<br />Best Trap-97.15

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            • #7
              Cool, I'll check the coil pack, the thought crossed my mind before, but I dismissed it pretty quick. I'd rather have to change those than the plugs, after my experience with changing the wires.
              I'll have to keep an eye on it in the mean time, and see if it is only after it warms up. Thanks all.
              Wife and a dog, they both think they\'re Kujo.<br /> <br />1999 3.8 A4 Y87<br />Navy Blue Metallic<br />BFG G-Force KDWS 275/40/17s, <br />WS6 Wheels (17x9)<br />Phoenix Transmissions 2400 Stall Converter<br />FRA, Holley Powershot filter, Whisper Lid, Ported Throttlebody<br />2000 manifolds, Flowmaster, WS6 Tail Pipes, <br />MSD 8.5mm Wires, MSD Coils, Autolite plugs<br />Performance Cryogenics treated rotors<br />1LE Sway Bars and panhard rod, 1LE front springs w/SLP Bilsteins, stock rear springs w/ 3rd Gen Bilsteins, BMR STB, KBDD SFCs, 1LE rear lower control arms, 1LE front lower control arms<p>1968 Chevelle Malibu 327 TH350

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              • #8
                SAME damn problem on my 93 3.4l!

                wow,,thought I was alone. Changing plugs and wires

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                • #9
                  How would you check the coil packs?

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                  • #10
                    yea, id like to hear away if there is one, i doubt it though, because i am having misfires
                    Camaro 95 3.4L M5<br />Flowmaster 80srs<br />Catco High Flo Cat<br />Slp CAI<br />Prime wheels

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                    • #11
                      when i first got my MSD DIS-4 ignition I thought it was that but it was the coil packs. First disconnect the wires from the coil packs and mark them. Then get a voltmeter and touch the black tip to ground and red to positive side of the terminal on the coil. If u got volts its the wires, but more than likely its the coil. So after that remove the bolts from the coil and remove it. Then check the terminals underneth the same way. If there is voltage ther but none on the coil its the bad coil. And if u had to continue checking the ICM. good luk
                      JOE COOL

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