Is it the O2 I need some advice

Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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1995BonnevilleSE
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Posts: 4
Joined: Fri Jun 18, 2010 3:49 pm
Year and Trim: 1995 Pontiac Bonneville SE 3.8 liter

Is it the O2 I need some advice

Post by 1995BonnevilleSE »

I have a 95 bonneville se. On start up it will idle fine and drive fine. Once the thermostat opens up, the Rpm's will fluctuate the check engine light comes on and the car will run extremely lean.But the problem does doesn't always exist it will go from a fluctuating idle at one stop to a consistant idle at the next. I've checked and repaired all vacuum leaks I found two, I also cleaned the mass airflow sensor. Since it is a 95 it's need's a ODM1 scanner the parts store only scans with a ODM2. Every shop I've called wants 65-100 bucks to scan it, I feel like I'm being cheat to pay $65 for maybe 5 minutes of work
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1995BonnevilleSE
LE Member
Posts: 4
Joined: Fri Jun 18, 2010 3:49 pm
Year and Trim: 1995 Pontiac Bonneville SE 3.8 liter

Re: Is it the O2 I need some advice

Post by 1995BonnevilleSE »

It only fluctate at idle
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J Wikoff
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Year and Trim: 1992 SSE
2009 G8 GT
Location: Central Illinois
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Re: Is it the O2 I need some advice

Post by J Wikoff »

Unplug the EGR valve and see if the behavior changes.
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WHITE WHINE - 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, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the 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, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim 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, 3.45 diff and various Camaro suspension bits, LED Taillights
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