96 ssei tranny stuff - 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 03-02-2011, 01:52 AM   #1
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Default 96 ssei tranny stuff

Hey guys, I have a 96 ssei. The tranny seems to shift fine, but the check engine light is always on. A local tranny shop said the codes for the shift solenoid(*) are showing, but when they test drove it they agreed is shifts fine. The only other thing I noticed is that it gets about 5-8 MPG, not sure if that is part of the tranny issue, but man gas aint cheap & I replaced nearly the entire ignition system & still **** poor mileage. Anyway, I am curious if I do need the solenoids or could it be something else? Also, can I do this in my garage without pulling the tranny out?
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Old 03-02-2011, 07:42 AM   #2
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Please go have the car scanned and get the actual code. It'll be a "P" and three digit number. That will help us narrow it down much better for you. Might be a simple loose/intermittant wire.

On the 5-8 mpg. Have you checked the O2 sensor and the catalytic converter? Sounds like you have a pretty serious issue there.
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