Question about 1997 Mercury Mountaineer

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1997 Mercury Mountaineer Overdrive flashing

SUV was driving fine, then when it gets up to about 40mph the OD light starts flashing. No check engine light. Drives fine, I can tell the OD is not on. The only thing it does is when I am slowing down to a stop it shifts a little hard into first. Any Ideas on how I can fix this myself??

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When the OD light flashes it means the transmission has developed a fault. As to what the fault may be is yet to be seen without the system being scanned. In many cases the light indicates the transmission is slipping, you may not feel it slipping, but the computer (called the PCM) senses it through the internal speed sensors that measure main shaft input speed and shaft output speed in RPM. Other problems like shift solenoids can cause this as well. Another factor can be the transmission fluid is worn out, it should be replaced along with a new filter every 60,000 miles minimum.

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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SOURCE: In 97 mercury mountaineer, how to turn off "check engine" light

Go to the local parts store, have them check the codes (they will do this for free usually). It will tell you what sensor needs to be checked/replaced. Once the part is replaced, it will clear on its own. They can also reset the code, but it will come back if the trouble persists.

Posted on May 27, 2009

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SOURCE: 2005 Mercury Mountaineer rear end whine, how hard to fix

Before you do this you might want to try fresh gear lube. On Ford products they use a synthetic additive in the rear and not in the front 4x4 axle.
The next thing would be to determine if it is a wheel bearing or a pinion bearing. You have to pull the axles and eliminate them as the problem. You might get lucky and not need to do the pinion.
The technical part of shimming the pinion gears with replacing the pinion bearing is about the worst part of the job. You won't know about the gears until you see them. You will need extra shims on hand.
It is a moderate job for two people. If you have all the parts it can be done in a day.

Posted on Aug 23, 2009

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wracefans24
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SOURCE: I have a 2004 Mercury Mountaineer. Sometimes when

you probably should change the transmission fluid and filter with that many miles on it.

Posted on Jan 02, 2010

emissionwiz
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SOURCE: 1997 Mercury Mountaineer What is Catalyst Efficiency Below (Bank

it means the catalyst is worn out, the efficiency is monitored by sensors, when the Cat falls below a certain reading or "threshold" the code is generating telling u that u need a new catalytic converter.

Posted on Feb 18, 2010

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SOURCE: Mercury mountaineer check engine light help

My 2002 M Mountaineer had the same problem and was fixed by reading the code that showed a leak in the gas tank pressure via the cap. When I replaced this with a good after market cap and drove the car for a while and it cleared itself. A mechanic told me that's not possible, but it did clear and has not lit up except on start up where it lights for a few seconds to test the bulb - a normal function.

Posted on Jul 02, 2010

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