Thread: 06 grand prix misses when I accelerate hard.

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  1. #1 06 grand prix misses when I accelerate hard. 
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    When I accelerate hard my car misses, the CEL light flashes. I put new coils, plugs and wires on it.
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  2. #2 Re: 06 grand prix misses when I accelerate hard. 
    GrandPrix Junkie
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    What type of plugs (copper, iridium, platinum?). What brand of coils? Stock coils are known to be the best so if you "upgraded" to another brand could be your issue as well.
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  3. #3 Re: 06 grand prix misses when I accelerate hard. 
    Killa Bee Scottydoggs's Avatar
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    could also be a clogged cat, stop flooring it. the flashing cel is telling you a catastrophic condition exists. aka stop going WOT till you figure it out.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: 06 grand prix misses when I accelerate hard. 
    GXP Level Member GTPpower's Avatar
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    What cylinder(s) is it missing on?


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  5. #5 Re: 06 grand prix misses when I accelerate hard. 
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    Was this happening before or after the new parts?
    GPONA #1 Cyber Bully
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  6. #6 Re: 06 grand prix misses when I accelerate hard. 
    GrandPrix Junkie HighOctaneRacing's Avatar
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    My guess is 2 of the new plugs are cracked. If the CEL flashes like crazy, I'm betting raw fuel is being dumped into the exhaust due to plugs not firing.

    Sent from my VS985 4G using Tapatalk
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  7. #7 Re: 06 grand prix misses when I accelerate hard. 
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    Stock ac delco plugs, duralast coils. It starts missing at 3000 rpms but if I get on it hard and then let out of it, it acts fine. I was thinking it was the fuel filter but the 06 have a non serviceable fuel system....only filter is in the tank....dumb in my opinion.
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  8. #8 Re: 06 grand prix misses when I accelerate hard. 
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    #6 cylinder is the one that registers but I thinking it's more than one cylinder
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  9. #9 Re: 06 grand prix misses when I accelerate hard. 
    I AM PEWPIN! rynoman03's Avatar
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    Replace cylinder 6 plug

    Sent from my VS990 using Tapatalk
    1999 GTPHP Tuned, Ported SC/TB, 42#'s, SSAC's, ZZP Modded 1.9's/LS6 Springs/Manley's, TransGo Shift Kit, Poly Uppers, KYB GR2's/Springtech's. - 231k and traded it in. - Gone
    2000 GTP: XP, P&P'd Heads, N*\Lq4 MAF, GenV, 42#'s, PRJ Rails\FPR, Racetronix, TEP w/ 3.29 Gears, 300m, 7/8" chain, SSAC's. - Collecting dust in my garage.
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  10. #10 Re: 06 grand prix misses when I accelerate hard. 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by rynoman03 View Post
    Replace cylinder 6 plug

    Sent from my VS990 using Tapatalk
    It's got new plugs and wires goob.

    Check the coil and injector. Swap them out with another cylinder and see if it follows the misfire.

    That's free.
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  11. #11 Re: 06 grand prix misses when I accelerate hard. 
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    Could have cracked a plug that happens


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  12. #12 Re: 06 grand prix misses when I accelerate hard. 
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    I'm having the same issue. I currently code for random cylinder misfire and a code for the supercharger charging circuit that comes up if I accelerate too hard. Car also chokes and rattles at that point. If I ease into the acceleration it's fine. The CEL flashes. Similar symptoms. Following.
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  13. #13 Re: 06 grand prix misses when I accelerate hard. 
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    Sounds like a bad coil


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  14. #14 Re: 06 grand prix misses when I accelerate hard. 
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    Okay more symptoms to add, temp gu age is normally below half. Yesterday it went just under 3/4 mark...not to the red. The. I would have heat from the heater sometimes, other times it would be cool air......are the series 3 known to have intake gasket issues or am I looking at one or both head gaskets bad?
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  15. #15 Re: 06 grand prix misses when I accelerate hard. 
    Killa Bee Scottydoggs's Avatar
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    flush the heater core, change the t stat, top off and bleed the coolant,. fill your overflow tank to the line on it. open the rad cap and check the level the next few mornings when its ice cold. watch for any leaks. top off if need be. first morning it might be a inch or so low.

    if you never flushed the coolant, nows as good a time as ever.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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