Question about Mercury Marquis
Check fluid level od is first to go when fluid gets low
Posted on Nov 15, 2008
This could be a serious transmission problem rearing it's ugly head. I'm assuming your transmission is not getting bad signals from the electronic controls. That should generate a trouble code and give you a check engine light in most modern cars.
The transmission is essentially a hydraulic device. A built in pump uses the transmission fluid to slide clutch packs into and out of engagement to shift gears. Shifting problems indicate there is not enough fluid pressure to make the shift. This can be caused by low fluid levels, clogged fluid filters or problems in the control valves. Fluid level you can check. The exact procedure is in your owners manual but for most cars should be done with the engine and transmission well warmed up and running with the transmission in park.
(typical front drive tranny cutaway)
The real problem here is that eventually the overdrive clutch packs will be damaged if you keep driving with them slipping. The clutch packs are deep inside the transmission and require some special tools and a certain amount of skill to replace not to mention the removal of the transmission. So again assuming you don't have a high-tech, electronically controlled transmission, I would take it to a good repair shop or three and get estimates on having it serviced.
Posted on Nov 15, 2008
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Posted on Jan 02, 2017
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