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PostPosted: Thu Sep 05, 2019 7:28 am 
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Joined: Thu Aug 22, 2019 8:39 am
Posts: 1
Year and Trim: 2002 Pontiac Bonneville SSEI
New to the group here. I have a 2002 Bonneville SSEI. Just noticed when rolling downhill yesterday that my boost gauge shot up to 0psi. I had my foot on the brake, not the gas. I parked and let it idle when I got home and the boost gauge was jumping around erratically. I would normally think it's just the stepper motor in the dash, but you could hear a change in the way the car ran. Then, it shut off on its own. Anyone had something similar? If so, how was it fixed? Thanks!


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PostPosted: Thu Sep 05, 2019 8:02 am 
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Joined: Mon May 19, 2008 7:01 pm
Posts: 16821
Location: Central Illinois
Year and Trim: 1992 SSE
2009 G8 GT
Could be a vacuum leak in the boost control actuator or lines leading to it. Or the manifold air pressure sensor is going bad, or... the wiring to it.

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WHITE WHINE - IT'S INTOXICATING. 1992 SSE Supercharged 236.26 ci (.040 Over)
15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Easy Performance Gen 3 Air/Fuel Calibrator, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, McCoy Motorsports Ceramic Coated Ported Exhaust Manifolds, Fan Override, PowerSlot Slotted Rotors.
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim Trailblazer mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser


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