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what can causes misfire code?

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Old Aug 14, 2012 | 03:11 PM
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Exclamation what can causes misfire code?
hey everyone i was just woundering why my car is showing a misfire code?.. i have a 1999 Trans am WS6 with Heads/Cam.. it idols great runs strong for a Heads/Cam untuned for now.. does anyone have any idea what it could be? its going to sound werid i think it might be the cam?. which i am prob wrong?
but thanks for the help if anyone knows what it is
Last edited by Slowcar51190; Aug 14, 2012 at 03:17 PM.
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Old Aug 14, 2012 | 06:37 PM
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Begin by looking at the coils/coilpack and spark plugs/spark plug wires
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Old Aug 14, 2012 | 06:55 PM
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As stated before look to see if the coil pack is arching out, or burnt wire, fouled plug.
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Old Aug 14, 2012 | 06:59 PM
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When i broke an intake pushrod i got a misfire code. I thought it was kind of humerous, even though this isnt going to help you any!
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Old Aug 17, 2012 | 06:40 AM
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Originally Posted by LS-ONE_DAY
Begin by looking at the coils/coilpack and spark plugs/spark plug wires
Originally Posted by canada4g63
As stated before look to see if the coil pack is arching out, or burnt wire, fouled plug.

I do have Fouled spark plugs when i do headers comming up i am of course going to change out the plugs and wire.. i mean it not mis-firing bad. but u it is pulling codes and taking a lot of power from the heads and cam,
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Old Aug 17, 2012 | 06:41 AM
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could it be. that my car isnt tuned?
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Old Aug 17, 2012 | 08:38 PM
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^ if it's not tuned, the plugs may be getting fouled and causing a misfire.
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Old Aug 21, 2012 | 12:05 PM
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i was reading up on the 1999 F-body LS1 and they were saying that the knock sensor go bad or is it get pintched that will cause a mis-fire code.. does anyone know about that problem or can anyone comfirm that it will read a misfire code?
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Old Aug 21, 2012 | 12:07 PM
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If it's untuned that is almost certainly your culprit. Get the car tuned.
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Old Aug 21, 2012 | 01:23 PM
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get the car tuned. My car misfired when my o2 sensors got wet. Even if yours didnt get wet, a bad o2 can cause a misfire.
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Old Aug 21, 2012 | 02:01 PM
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Originally Posted by Slowcar51190
i was reading up on the 1999 F-body LS1 and they were saying that the knock sensor go bad or is it get pintched that will cause a mis-fire code.. does anyone know about that problem or can anyone comfirm that it will read a misfire code?
No, that will cause a knock sensor code instead.
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