94' Buick Century - Shifting Problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-14-2013, 01:48 PM   #1
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Unhappy 94' Buick Century - Shifting Problem

Hello,
Has anybody had this happen or any clue to what it might be?

I recently replaced the coils, wires, and plugs. The engine was running beautifully after I did. It has nearly 260,000 miles, no rough idle, and it had good power when accelerating. I say had because I began to notice a slight power loss, not much, about a month after the repairs.
Then this happened. I am cruising along at 65 and suddenly it feels like my engine slips gears, from overdrive to third. If I accelerate it does not shift. There are no strange noises and the slipping is very smooth when it happens. If I put my car in neutral while I am driving, turn it off and then start it again; after engaging drive again it shifts into overdrive correctly. It also seems to do it more on hot days or after driving it 20 or more miles. When I said I noticed it slightly lost power while accelerating, it is only in the gears above third.
I am hoping this is not leading up to a major transmission problem.
I also have an O2 sensor that has gone out. Do not know if this has had a factor in it. The engine still runs great besides this and I would like to get another year (more if possible) out of it before I decide to lay it to rest.
Any ideas or thoughts on this would be greatly appreciated.
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Old 07-14-2013, 08:15 PM   #2
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When was the last time the fluid and filter was replaced?
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Old 07-15-2013, 06:56 PM   #3
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Oil has been changed every 4-5k miles. Oil and air filter, every other oil change. Fuel filter, never. Did a radiator flush about three years ago when I changed the water pump. Transmission fluid is still runny and light-red. Trans has not been flushed or filter changed in 4+ years.
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