Thread: 2001 3.1 Bogging under partial throttle

Results 1 to 3 of 3
  1. #1 2001 3.1 Bogging under partial throttle 
    SE Level Member
    Join Date
    Feb 2017
    Location
    CO
    Posts
    2
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    First time poster. Fair knowledge about cars.

    I have a 2001 Grand Prix with 3.1L engine with about 150K miles. Under partial throttle, there is a vacuum leak sound. The sound comes on and off while maintaining the partial throttle. When the sound is occurring, the engine bogs. When I push the floor it, it down shifts and stops bogging. No check engine light. I started replacing parts that seemed like it would help.
    1. Intake Temp Sensor
    2. MAF sensor
    3. PVC valve
    4. O2 sensor


    At this point is when I started hearing the pulsing vacuum leak. I started blocking anything that has vacuum to see if I could get the sound to stop. When I unplugged the EGR valve, the pulsing vacuum leak sound stopped. I then replaced the EGR valve. Nothing changed. The pulsing vacuum leak sound still occurred under partial throttle. When the EGR valve wires are disconnected, the engine runs better and the check engine light came on.

    I checked the EGR passage to the intake manifold and it is not clogged. I checked the EGR tube from the exhaust and it is not clogged. I am at a loss of what I can test / replace from here. One other side note, the coolant ran out before this problem started. It has always had some small loss of coolant since I bought the car 12 years ago.

    Fixing the coolant issue I replaced:
    1. Radiator
    2. Thermastat
    3. Temp sensor
    4. Radiator hoses
    5. Coolant level sensor

    Any ideas on what to check now as far as the bogging issue?

    Thank you much,
    Jeff
    Reply With Quote  
     

  2. #2 Re: 2001 3.1 Bogging under partial throttle 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
    Join Date
    Sep 2009
    Location
    Rogers, MN
    Posts
    21,022
    Thanks (Received)
    21
    Likes (Received)
    45
    Dislikes (Received)
    0
    Have you smoke tested the intake for a leak?

    I forget if the egr system has those metal tubes on the 3.1's.

    SMGPFC Member #1
    Reply With Quote  
     

  3. #3 Re: 2001 3.1 Bogging under partial throttle 
    SE Level Member
    Join Date
    Feb 2017
    Location
    CO
    Posts
    2
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Update. I drove the car more and it was bogging all the time. I then suspected the catalytic converter. I removed the O2 sensor and disconnected the egr tube from the egr valve . This opened up holes in the exhaust before the cat. The car drive some what better. I took it to the muffler shop and had the cat replaced. All good now.
    Reply With Quote  
     

Similar Threads

  1. 2001 GTP partial partout
    By dmack976 in forum For Sale - Parts
    Replies: 81
    Last Post: 03-30-2019, 07:54 PM
  2. 2001 GTP partial partout
    By dmack976 in forum For Sale - Parts
    Replies: 2
    Last Post: 03-23-2017, 08:56 AM
  3. Replies: 48
    Last Post: 02-28-2017, 10:17 PM
  4. Replies: 4
    Last Post: 09-06-2014, 07:16 AM
  5. 2001 gtp throttle surge and more
    By soccerboi11 in forum General Tech Discussion
    Replies: 1
    Last Post: 10-22-2011, 07:44 AM
Bookmarks
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
  •