Pontiac Grand Prix Forums : Grandprix
 

Grand Prix Forums is the premier Pontiac Forum on the internet. Registered Users do not see the above ads. Please Register - It's Free!

Pontiac Grand Prix Forum - Welcome Register today! Contact us!

Results 1 to 20 of 20
  1. #1
    Donating Users
    Join Date
    Nov 2017
    Location
    Missouri
    Posts
    5
    Chats
    0

    Default Hello from Missouri

    Hello all. I just picked up a 2000 GTP on the cheap. It runs like crud, and I joined the forum to research some codes.

    Current codes:

    P0102 The MAF sensor has already been replaced, but not by me
    P0122 TPS
    P0452 Evap Pressure Sensor Low input
    P0453 Evap Pressure Sensor High input

    I'm not real sure how the Evap Pressure sensor can be both Low and High at the same time. Seems odd to me.

    I'm waiting on a new fuel pump to come in the mail, and maybe I'll try a new gas cap as well. But I'm just shooting on the dark at the moment.

    If I get too stumped, I'll post a thread in the appropriate area.

    Cheers!
    Steve

  2. #2
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    3,826
    Chats
    0

    Default Re: Hello from Missouri

    Check the wiring to the MAF, and the fuse (I want to say fuse #21). Also, if it was replaced with a non OEM MAF, it could be junk. Best replacement is a junkyard OE one on these cars.

    Where in MO are you?

  3. #3
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    3,826
    Chats
    0

    Default Re: Hello from Missouri

    P0452- Potential causes for this DTC include:

    Failed fuel tank pressure sensor Harness to the sensor has an open or short circuit Faulty electrical connection to the FTP sensor Cracked or broken vapor line to the vacuum canister Cracked or broken positive vapor line to the tank Plugged line Leaky gasket at the fuel pump module Gas cap left loose resulting in a loss of vacuum Pinched vapor line


    Read more at: http://www.obd-codes.com/p0452
    Copyright OBD-Codes.com


    keep looking. check over the wires to the purge solenoid, and the canister tank in the rear quarter panel.

    P0453- take the driver side back wheel off, then unscrew the plastic cover, behind it is the evap canister fill hoses and another solenoid on the top of the canister tank. theres a few line to and from this tank, see if any or broken or off.

    some times the canister tank just takes a crap, if its got gas inside, ( you'll have to unbolt it and shake it) then it needs to be changed.

    P0122- A P0122 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V).

    DTC P0122

    CIRCUIT DESCRIPTION
    The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies each TP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit.

    The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases from above 4 volts at idle to below 1 volt at wide open throttle (WOT). TP sensor 2 signal voltage increases from below 1 volt at idle to above 4 volts at WOT.

    If the ECM detects TP sensor 1 signal voltage is too low, this DTC sets.

  4. #4
    GT Level Member wstefan20's Avatar
    Join Date
    Aug 2017
    Location
    Raytown, MO
    Posts
    399
    Chats
    33

    Default Re: Hello from Missouri

    Where in Missouri? I'm on the Kansas side and don't mind lending a hand. Got a good scan tool too! Got a spare stock maf sensor if you need it. Aftermarket ones are all crap. Just ask Scotty

  5. #5
    Donating Users
    Join Date
    Nov 2017
    Location
    Missouri
    Posts
    5
    Chats
    0

    Default Re: Hello from Missouri

    Quote Originally Posted by FordMan77 View Post
    Check the wiring to the MAF, and the fuse (I want to say fuse #21). Also, if it was replaced with a non OEM MAF, it could be junk. Best replacement is a junkyard OE one on these cars.

    Where in MO are you?
    I'm about 15 miles west of Jefferson City, in a small town called Russellville. Population around 800ish. Thanks for the advice. Much appreciated.

  6. #6
    Donating Users
    Join Date
    Nov 2017
    Location
    Missouri
    Posts
    5
    Chats
    0

    Default Re: Hello from Missouri

    Quote Originally Posted by wstefan20 View Post
    Where in Missouri? I'm on the Kansas side and don't mind lending a hand. Got a good scan tool too! Got a spare stock maf sensor if you need it. Aftermarket ones are all crap. Just ask Scotty
    Good to know about the MAF. Probably why its still throwing the code after it's been replaced. I've always been a Mustang guy, but I've never owned a supercharged car before and I've read good things about the GTP. Hopefully I can get it sorted and road worthy. It's real straight body wise, with just a couple imperfections. I'm looking forward to giving her a spin.

  7. #7
    GT Level Member wstefan20's Avatar
    Join Date
    Aug 2017
    Location
    Raytown, MO
    Posts
    399
    Chats
    33

    Default Re: Hello from Missouri

    Been up that way before. Wish I could say I'd be up that way before the holidays though. Let me know if you need a maf sensor though, and if you're ever in KC, consider this an open invite. Not enough of us GP guys left out this way sadly. Good luck on your project, and feel free to ask questions. I've never had one unanswered here.

  8. #8
    GT Level Member wstefan20's Avatar
    Join Date
    Aug 2017
    Location
    Raytown, MO
    Posts
    399
    Chats
    33

    Default Re: Hello from Missouri

    Quote Originally Posted by SteveSS View Post
    Good to know about the MAF. Probably why its still throwing the code after it's been replaced. I've always been a Mustang guy, but I've never owned a supercharged car before and I've read good things about the GTP. Hopefully I can get it sorted and road worthy. It's real straight body wise, with just a couple imperfections. I'm looking forward to giving her a spin.
    Yeah... I had this exact problem when I started working on my N/A grand prix. Pretty annoying really. I wasn't getting any codes but it felt sluggish, swapped back to stock and it was an entirely different beast!

  9. #9
    Donating Users
    Join Date
    Nov 2017
    Location
    Missouri
    Posts
    5
    Chats
    0

    Default Re: Hello from Missouri

    Quote Originally Posted by FordMan77 View Post
    P0452- Potential causes for this DTC include:

    Failed fuel tank pressure sensor Harness to the sensor has an open or short circuit Faulty electrical connection to the FTP sensor Cracked or broken vapor line to the vacuum canister Cracked or broken positive vapor line to the tank Plugged line Leaky gasket at the fuel pump module Gas cap left loose resulting in a loss of vacuum Pinched vapor line


    Read more at: http://www.obd-codes.com/p0452
    Copyright OBD-Codes.com


    keep looking. check over the wires to the purge solenoid, and the canister tank in the rear quarter panel.

    P0453- take the driver side back wheel off, then unscrew the plastic cover, behind it is the evap canister fill hoses and another solenoid on the top of the canister tank. theres a few line to and from this tank, see if any or broken or off.

    some times the canister tank just takes a crap, if its got gas inside, ( you'll have to unbolt it and shake it) then it needs to be changed.

    P0122- A P0122 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V).

    DTC P0122

    CIRCUIT DESCRIPTION
    The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies each TP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit.

    The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases from above 4 volts at idle to below 1 volt at wide open throttle (WOT). TP sensor 2 signal voltage increases from below 1 volt at idle to above 4 volts at WOT.

    If the ECM detects TP sensor 1 signal voltage is too low, this DTC sets.
    Good stuff here. Thank you. The weather is bad here today, but as soon as it clears up, I'll check these.

  10. #10
    GTP Level Member JamesIvey24's Avatar
    Join Date
    May 2011
    Location
    Illinois
    Posts
    502
    Chats
    13230

    Default Re: Hello from Missouri

    And I work downtown St. Louis, MO at Barnes Hospital, if you get this way and need a scan tool, or tuner to remove codes.

  11. #11
    GT Level Member
    Join Date
    May 2017
    Location
    Dirtyzville, Mizzery
    Posts
    311
    Chats
    654

    Default Re: Hello from Missouri

    Quote Originally Posted by wstefan20 View Post
    Been up that way before. Wish I could say I'd be up that way before the holidays though. Let me know if you need a maf sensor though, and if you're ever in KC, consider this an open invite. Not enough of us GP guys left out this way sadly. Good luck on your project, and feel free to ask questions. I've never had one unanswered here.
    KC was the largest area for WBody's besides Michigan.

    Hence why we used to do all the Branson GP Meets.

    We've all just mostly moved on to other platforms.
    1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily
    2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
    Sold WBody's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP

  12. #12
    GT Level Member wstefan20's Avatar
    Join Date
    Aug 2017
    Location
    Raytown, MO
    Posts
    399
    Chats
    33

    Default Re: Hello from Missouri

    Quote Originally Posted by blueguy91 View Post
    KC was the largest area for WBody's besides Michigan.

    Hence why we used to do all the Branson GP Meets.

    We've all just mostly moved on to other platforms.
    Yeah...I'm young and broke so this is the first time I could afford this platform and why I'm stuck here, but for a first timer, I'm enjoying it! Just wish there were more guys near me to grab a beer with and work on these cars. Moved recently and my wife is driving me insane! Haha

  13. #13
    GT Level Member
    Join Date
    May 2017
    Location
    Dirtyzville, Mizzery
    Posts
    311
    Chats
    654

    Default Re: Hello from Missouri

    Well, I'm not sure if we're planning any trips to HPT or Osborn in 2018...but we can keep everyone in the loop.

    Probably have my heads/cam setup then so it'll make more than 12hp.
    1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily
    2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
    Sold WBody's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP

  14. #14
    GT Level Member wstefan20's Avatar
    Join Date
    Aug 2017
    Location
    Raytown, MO
    Posts
    399
    Chats
    33

    Default Re: Hello from Missouri

    awesome! Just keep me in the loop! My car is still fairly stock, I'm mainly waiting till I have access to a tuner, or have the money to buy one too mod much.

  15. #15
    GT Level Member
    Join Date
    May 2017
    Location
    Dirtyzville, Mizzery
    Posts
    311
    Chats
    654

    Default Re: Hello from Missouri

    We happen to know some people that can do things, lol
    1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily
    2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
    Sold WBody's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP

  16. #16
    SE Level Member Jammonz's Avatar
    Join Date
    Sep 2017
    Location
    Missouri
    Posts
    10
    Chats
    0

    Default Re: Hello from Missouri

    Welcome SteveSS.........from a small town northeast of Joplin.....Carthage. I've been there with the same problems and used used parts off of another Buick 3800.....great results and found a good place on ebat(y) that sells OEM for a fraction of auto bins around here!
    "We.......over 60......are like old trees! Our Limbs may be Wilting and falling off, but our BARK is still there!!"

  17. #17
    Donating Users Slick2500's Avatar
    Join Date
    Oct 2010
    Location
    Box Elder, South Dakota, United States
    Posts
    7,416
    Chats
    49401

    Default Re: Hello from Missouri

    Quote Originally Posted by blueguy91 View Post
    KC was the largest area for WBody's besides Michigan.

    Hence why we used to do all the Branson GP Meets.

    We've all just mostly moved on to better platforms.
    Fixed
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower

  18. #18
    I break stuff selliott's Avatar
    Join Date
    May 2009
    Location
    Kansas City
    Posts
    1,130
    Chats
    7997

    Default Re: Hello from Missouri

    Welcome although getting ready to move on to a new platform with the other kc Gp guys I will always have my Gp unless someone brings a pile of cash lol

  19. #19
    Donating Users
    Join Date
    Nov 2017
    Location
    Missouri
    Posts
    5
    Chats
    0

    Default Re: Hello from Missouri

    Thanks everyone for the welcome. What platform is everyone moving to?

  20. #20
    GT Level Member
    Join Date
    May 2017
    Location
    Dirtyzville, Mizzery
    Posts
    311
    Chats
    654

    Default Re: Hello from Missouri

    Quote Originally Posted by SteveSS View Post
    Thanks everyone for the welcome. What platform is everyone moving to?
    https://www.youtube.com/watch?v=yurIFOKSzvM

    ^^That
    1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily
    2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
    Sold WBody's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP

Similar Threads

  1. New here from SW Missouri
    By dwjrm6110 in forum Introductions/Noob Questions
    Replies: 14
    Last Post: 03-12-2017, 08:55 PM
  2. Anyone else around missouri
    By Cartune in forum Introductions/Noob Questions
    Replies: 3
    Last Post: 08-16-2012, 04:14 PM
  3. Hi from Missouri
    By Backflow in forum Introductions/Noob Questions
    Replies: 5
    Last Post: 07-09-2012, 09:04 AM
  4. From Missouri
    By macpirate in forum Introductions/Noob Questions
    Replies: 3
    Last Post: 03-31-2012, 12:39 PM
  5. new guy from missouri
    By redgtp08 in forum Introductions/Noob Questions
    Replies: 18
    Last Post: 04-13-2008, 12:56 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •