Very low boost on 2000 GTP

1,185

Asked by Feb 18, 2017 at 03:56 PM about the Pontiac Grand Prix

Question type: Maintenance & Repair

My 2000 GTP rather suddenly will only produce very low supercharger boost. There are no computer codes and other than  the low boost problem it runs fine. It has 142,000 miles on it. The supercharger itself is not mechanically noisy, and the supercharger oil has been changed 3 times in its life. What controls the boost and how can I fix this problem??

1 Answer

1,185

I found that the "dump valve" was being held partially open at all times. Disconnected the vacuum actuator and soaked the damper actuator shaft where it enters the supercharger body with PB Blaster. Then I worked the shaft by hand until it regained its full range of motion with no sticking or drag. Reassembled linkage and took it out for a test run....... it works fine and comes up to full boost again.

Your Answer

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,470
  • #2
    Tom Demyan
    Reputation
    3,110
  • #3
    munron
    Reputation
    2,500
View All

Related Models For Sale

Used Chevrolet Impala
572 Great Deals out of 34,341 listings starting at $890
Used Pontiac G8
11 Great Deals out of 444 listings starting at $5,400
Used Dodge Charger
447 Great Deals out of 32,879 listings starting at $1,999
Used Pontiac Bonneville
487 listings starting at $1,799
Used Chevrolet Monte Carlo
11 Great Deals out of 1,252 listings starting at $1,488
Used Ford Mustang
599 Great Deals out of 38,611 listings starting at $1,895
Used Pontiac Grand Am
1,075 listings starting at $1,800
Used Pontiac GTO
5 Great Deals out of 446 listings starting at $4,995
Used Chevrolet Malibu
1,035 Great Deals out of 60,988 listings starting at $880
Used Pontiac G6
44 Great Deals out of 3,884 listings starting at $1,200
Used Chevrolet Camaro
438 Great Deals out of 31,256 listings starting at $1,450
Used Pontiac Firebird
9 Great Deals out of 759 listings starting at $3,500
Used Dodge Challenger
230 Great Deals out of 24,821 listings starting at $7,750
Used Chrysler 300
322 Great Deals out of 19,326 listings starting at $900
Used Jeep Grand Cherokee
1,028 Great Deals out of 71,592 listings starting at $1,195

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.