Thread: wierd hesitation/sputter issue when wot

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  1. #1 wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    I got a video, if you turn the volume up you can hear a wierd noise at 6000rpms/40mph area.
    https://www.youtube.com/watch?v=tguKNPX6dE4
    The car doesn't really slow down or anything, its wierd, I am doing plugs,wires,fuel filter on the weekend. but wondering if you guys think it could be anything else.

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  2. #2 Re: wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    changed the spark plugs and wires, still having the same issue. anyone have an idea?

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  3. #3 Re: wierd hesitation/sputter issue when wot 
    GTP Level Member Tonkin2000GT's Avatar
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    Could be hitting the rev limiter I had the same issue

    Sent from my SM-G920V using Tapatalk
    00 Grand Prix GT, top swapped, .020 FMP, GT1 Cam, SFI Crank pulley, SSM90, 3.3 MPS, ZZP ported Gen 3/LIM, ported heads, #90's, N* TB, SLP Intake/Headers/Catback, F-body brakes, KYB AGX, Aeroforce, AEM, 93 octane.
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  4. #4 Re: wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    But if you look at the video the Rpms and speedo keep going.

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  5. #5 Re: wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    No one else has any ideas?

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  6. #6 Re: wierd hesitation/sputter issue when wot 
    GTX Level Member Travisgt2's Avatar
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    Have you checked spark plugs? When I just moved my coil packs I had issued with it stuttering one my coil packs was going out I think. I also added a ground from my battery to the block and then added a ground from the plate they sit on to the block also make sure there is no rust or corrosion on the coil pack posts
    Last edited by Travisgt2; 04-18-2016 at 02:08 PM.
    04 GT2: 180 t-stat, cold air intake, reptile tune, plog, hv3, gt1 cam, 90#springs, new push rods, new lifters, port polished heads, lim, uim and tb, 06 Impala brakes and steel brake lines. Cosmetic: black roof rails, under glow, Pontiac ground light, blue hud dic radio controls and cluster. To come custom hood.
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  7. #7 Re: wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    I put new spark plugs and new wires, still the exact same issue.
    I'm looking at the coil packs next. But I'd hate to replace them and not fix the issue lol.

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  8. #8 Re: wierd hesitation/sputter issue when wot 
    GTX Level Member Travisgt2's Avatar
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    Pick some up from the junk yard. That is what I did. I think the stock coil packs are better then any after market.
    04 GT2: 180 t-stat, cold air intake, reptile tune, plog, hv3, gt1 cam, 90#springs, new push rods, new lifters, port polished heads, lim, uim and tb, 06 Impala brakes and steel brake lines. Cosmetic: black roof rails, under glow, Pontiac ground light, blue hud dic radio controls and cluster. To come custom hood.
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  9. #9 Re: wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    Did a WOT run last night, major hesitation and loss of power, got a flashing c.e.l light also code was p0302 , a misfire. Going to replace the coil packs this weekend

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  10. #10 Re: wierd hesitation/sputter issue when wot 
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    Just move them around and see if it moves. I just had a miss under full throttle and set up Torque to display misfire in each cylinder. When It started dropping power it had like 400 misses on Cylinder 1. I changed the #1 wire and still same thing. I had already changed the plugs 2 weeks ago and it ran great to Dallas and back then I degreased the engine compartment and that's when it started. I ended up changing the coil and it went away. I had gotten the flashing CEL before as well. It still amazes me that a coil can go bad on a waste spark coil and only one plug is affected. One other thing I can't watch the video right now, but I also got a rattling sound like I had something in the cylinder when I would get on it. Sounded like it was knocking and something was loose in the engine. I thought I had chipped a piston it was so bad sounding. So anyway it was the coil.

    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  11. #11 Re: wierd hesitation/sputter issue when wot 
    GXP Level Member Grimsin's Avatar
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    I figure might as well change all 3 coils, there are 10 years old so might as well

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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