Speed sensor. It plugs in to the transmission you can see it right in front. Just pulls out. You can find one pretty easy on the net for around 40 bucks. Unplugging a working one gives same results, slow pickup speed low mpg.
Check the fuel pressure first, then have the exhaust back pressure checked, your Catalytic converter may be staring to plug.
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Changed the plugs, and now its running rough with small backfires. Slow to accelerate. Being the back side plugs were difficult to change, not 100% sure there in the right order.
Changing the back plugs on the my car was a pain, but the number one problem of doing this to a Buick Century is putting the back plugs in sideways abit and it makes everything eles fail. Well thats what I did and been told my a few local shops around me. Same problem.
After the sensor was replaced we hit bump in the road and the tranny and speedometer started working. Later it went back to not working again. I was told there were two different priced sensor for this car, what is the diff in them?
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