Thread: 2005 GTP Hesitation/Sluggish

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  1. #1 2005 GTP Hesitation/Sluggish 
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    2005 Grand prix gtp stock it hesitates to accelerate, sometimes car feels very slow. Sometimes it acts very normal and is a rocket. I changed plugs wires... just tired of throwing money at the car. I even had the PCM updated at the dealership. I did notice that problem seems to go away when I restart the car sometimes.

    Another way to explain issue is say I'm at a light. I press throttle 1/4 of the way, sometimes it accelerates very slow. When the car acts normal it squeals the tires a bit.

    I do see that two members fixed the issue somewhat with an aftermarket PCM tune. Any advice is greatly appreciated as this is making me go crazy.
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  2. #2 Re: 2005 GTP Hesitation/Sluggish 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    What brand plugs?

    To help, I would remove the throttle body and clean it, I bet its all black and nasty. Also remove the MAF sensor and clean it with MAF cleaner.

    Just doing those 2 things can help alot.
    Last edited by Fivefingerdeathpunch; 06-16-2012 at 12:23 PM.

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  3. #3 Re: 2005 GTP Hesitation/Sluggish 
    GXP Level Member sLpGPGT's Avatar
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    does it happen every once in a while then u restart the car and problem solved?
    EDIT: cause mine does the same thing
    07 Daytona R/T, 43/1500, Borla Exhaust
    AEM bruteforce intake
    Diablo 93 Octane tune
    Kooks longtube's w/highflow cats


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  4. #4 Re: 2005 GTP Hesitation/Sluggish 
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    plugs are new tr55s but it did same thing with old ones. I also cleaned the throttle body and maf last month.

    sLpGPGT yes if happens once in a while and seems to go away when car is restarted. Although today went to store and got back in car and it bogged exiting the parking lot.

    Almost seems to do it more when I turn.
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  5. #5 Re: 2005 GTP Hesitation/Sluggish 
    GXP Level Member sLpGPGT's Avatar
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    mine just does it in the lower gears, in 3rd is seems to go away but still sluggish when shifting in higher gears but in higher gears it dont chug, i got no idea wat my problem is either but id thought id relate a problem with someone else haha
    07 Daytona R/T, 43/1500, Borla Exhaust
    AEM bruteforce intake
    Diablo 93 Octane tune
    Kooks longtube's w/highflow cats


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  6. #6 Re: 2005 GTP Hesitation/Sluggish 
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    Could it be the transmission as sometimes the car revs and clunks into gear at a light. Maybe the transmission is sticking or causing a hangup? Could it be the transmission as sometimes the car revs and clunks into gear at a light. Maybe the transmission is sticking or causing a hangup?
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  7. #7  
    GTX Level Member acidcrashdburnd's Avatar
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    My 2005 GT does that. It did it before and after the top swap. I think it has to do with heat and humidity. Causes the timing to change.

    Sent from my Galaxy Nexus using Tapatalk 2
    2005 GPGT- Top Swapped Click me! 15.5 @109
    2002 GPGT- slow and stock
    1993 Oldmobile 88
    - exploded the diff @158k
    GPF Resident Flowmaster Troll
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  8. #8 Re: 2005 GTP Hesitation/Sluggish 
    SE Level Member SlprGS's Avatar
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    my girlfriend's 2005 is doing that also. We just picked it up so I'm gonna do a routine tuneup on it sometime this week..
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  9. #9 Re: 2005 GTP Hesitation/Sluggish 
    GT Level Member GMCustomerService's Avatar
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    Corey Prashker,

    This issue may be caused by a non-holding torque converter stator or damaged stator support shaft within the automatic transmission. This is just a suggestion, not a diagnosis. You may want to consider having the vehicle inspected by a certified technician.

    Please keep us posted.

    Louis
    GM Customer Service
    Check out the NEW Owner Center at: My.GM.com
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  10. #10 Re: 2005 GTP Hesitation/Sluggish 
    GT Level Member t24moore's Avatar
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    A bad oxygen sensor can cause that. Do you have a CEL light? Do you know of anyone with a OBD scanner? If youre going to spend any more money buy yourself a scan tool.
    Comp Turbo 6765 T4-ST5-A2A IC-Ported Heads-Custom Turbo headers-80 lb inj-F-Body UIM and LIM-AEM WB, TEP trans w 1" chain and Circle D TC, Dual 255s, Bilstien Struts
    WHY IS EVERYONE SO OPPOSED TO DOING A COMPRESSION TEST TO TROUBLESHOOT PROBLEMS?
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  11. #11 Re: 2005 GTP Hesitation/Sluggish 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by t24moore View Post
    buy yourself a scan tool.
    This.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  12. #12 Re: 2005 GTP Hesitation/Sluggish 
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    I have a very good scan tool. How would I go about checking if the o2 sensors are bad? They seem to be putting out a voltage and it switches... is there a certain value?
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  13. #13 Re: 2005 GTP Hesitation/Sluggish 
    GT Level Member t24moore's Avatar
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    You usually can just look at the logs and see if the values constantly switches. It should never remain high or low. Only time it should lock into one voltage is when you go WOT. One question tho, does the car do this when you first start it up or after its warm?
    Comp Turbo 6765 T4-ST5-A2A IC-Ported Heads-Custom Turbo headers-80 lb inj-F-Body UIM and LIM-AEM WB, TEP trans w 1" chain and Circle D TC, Dual 255s, Bilstien Struts
    WHY IS EVERYONE SO OPPOSED TO DOING A COMPRESSION TEST TO TROUBLESHOOT PROBLEMS?
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  14. #14 Re: 2005 GTP Hesitation/Sluggish 
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    I took the car to the stealership and they played with it for a few hours and I left it overnight. They said it didn't act up but it was probably my Hot air intake (cone filter on the end of maf) Is this possible? What do I need to do to be able to run this type of filter? Would a PCM by overkill be programmed to allow for new maf settings?
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  15. #15 Re: 2005 GTP Hesitation/Sluggish 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    Tune won't do a thing for you there.

    Put your stock stuff back on.
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  16. #16 Re: 2005 GTP Hesitation/Sluggish 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by Corey Prashker View Post
    I took the car to the stealership and they played with it for a few hours and I left it overnight. They said it didn't act up but it was probably my Hot air intake (cone filter on the end of maf) Is this possible? What do I need to do to be able to run this type of filter? Would a PCM by overkill be programmed to allow for new maf settings?
    Put some distance between the filter and the MAF.
    It's a CUMMINS Dodge not a Dodge Cummins
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  17. #17 Re: 2005 GTP Hesitation/Sluggish 
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    Ok guys just as an update, car seems to run better for a while after you give it a few WOT runs. At 3200 rpms at medium throttle car suddenly develops a surge of power, feels like a vtech boost. My supercharger bypass valve seems to be working... Could this ALL be a THROTTLE body issue as the TPS, servo motor are all in this unit. Maybe its getting stuck? I did take it off for a thorough clean (wasn't very dirty).
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  18. #18 Re: 2005 GTP Hesitation/Sluggish 
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    I have a 2005 GTP, and it runs absolutely perfect when the engine is cold. But after the engine warms up, sits for 20-30 minutes, and I restart the car and take of. The car acts like it's not getting any gas, sputters, and will hit 4000rpm just to get going. I always use the Shell 93 V-power gas in it, so I don't think I have bad gas. And then after the engine cools off for a few hours, boom, it's a rocket again.

    Any ideas? I love this car, but this is really annoying.

    Jeff
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  19. #19 Re: 2005 GTP Hesitation/Sluggish 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by Corey Prashker View Post
    Ok guys just as an update, car seems to run better for a while after you give it a few WOT runs. At 3200 rpms at medium throttle car suddenly develops a surge of power, feels like a vtech boost. My supercharger bypass valve seems to be working... Could this ALL be a THROTTLE body issue as the TPS, servo motor are all in this unit. Maybe its getting stuck? I did take it off for a thorough clean (wasn't very dirty).
    Did you put the stock intake stuff back on like Nixon suggested?
    It's a CUMMINS Dodge not a Dodge Cummins
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  20. #20 Re: 2005 GTP Hesitation/Sluggish 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by lawadm1 View Post
    I have a 2005 GTP, and it runs absolutely perfect when the engine is cold. But after the engine warms up, sits for 20-30 minutes, and I restart the car and take of. The car acts like it's not getting any gas, sputters, and will hit 4000rpm just to get going. I always use the Shell 93 V-power gas in it, so I don't think I have bad gas. And then after the engine cools off for a few hours, boom, it's a rocket again.

    Any ideas? I love this car, but this is really annoying.

    Jeff
    Check for codes yet?

    Sound like your PCM is pulling timing when it warms up.

    Is the car stock?
    It's a CUMMINS Dodge not a Dodge Cummins
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