running rich - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 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 and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-03-2011, 05:12 PM   #1
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does any body know if the 3.8 liter motors from gm had a problem with always running rich. and if they did would it cause them damage if they computer was reprogrammed or the chip was changed
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Old 02-03-2011, 05:19 PM   #2
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If you have a exhaust leak between the heads and the O2 sensor the engine will run rich. If the O2 sensor is old and getting clogged up, it will run rich. Damage from running rich long term is the cat. It will over load and heat up, and then it'* shot.
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Old 02-15-2011, 12:38 PM   #3
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how can there be a leak in between the heads and the O2 sensor, the sensor is on the exhaust manifold. but i will try the sensor because it could definatly be clogged
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Old 02-15-2011, 12:42 PM   #4
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There'* a few gaskets between the heads and the sensor, 2 exhaust gaskets and 2 donut gaskets, not to mention the EGR
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Old 02-15-2011, 12:43 PM   #5
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The exhaust manifold to head gasket or a crack in the 92-95 manifolds, which is very common to have happen.
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Old 02-16-2011, 07:34 PM   #6
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oh crud well im gonna check the sesnor first and hope that is the problem thanks for the info guys
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