Question about Ford Expedition
We parked the vehicle on a gentle incline, it is icey, the vehicle is in park, it rolled back 1-2 feet, one front tire appeared to skid, while the other one rolled. Is this normal?
Posted by Anonymous on
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Posted on Jan 02, 2017
What may have happened is that one of the tire pressure sensors was damaged, or the system was not reset.
The tire presure sensors use radio frequency to tell the module the tires presure and location. Replacing tires can sometimes damage them. The sensor is part of the valve stem. Use the driver info buttons to go to the tire pressure / location info. If you see " -- ", then the system cannot read the tires. Tech JK
Posted on Jan 16, 2009
Your linkage is out of adjustment or worn bushing. There is a series of links and rods that accomplish the changing of gears,(especially with a column shifter). The links sometimes have plastic or nylon bushings. They become worn or broken and allow for maladjustment--not going into gear or park fully.
If it isn't going into park and the linkage is correctly adjusted with no damage, you should suspect internal transmission damage.
If you don't feel comfortable about this repair, a respected shop is your best bet.
Posted on May 02, 2009
You have two separate issues here. First, the delay going into gear may
benefit from a fluid change providing that the cause isn't just low
fluid level but not always. It will not help immediately, because
likely there is a lazy shift valve caused by a small amount of varnish
which may need some time to clean up. It may not help at all if the
valve is sticking because of wear or other internal mechanical problem.
Your other problem is with going out of park. Actually, that is a normal condition that happens in every vehicle, but is more noticeable in heavier ones or those with slightly shorter shift arms on the transmission itself. Virtually every manufacturer uses the same method of locking a transmission in park. This is done by using a square piece of steel that fits into a square slot on the outside of an internal drum which is locked to the mainshaft of the transmission. Around that drum there are multiple slots as well as "blank" areas between them so that you can select park without having the vehicle need to roll a full revolution before the piece of steel (called the parking pall) can engage the drum. It does need to roll a bit till it finds a slot though. Putting the parking brake on takes tension from the drum and pall, so that the pall is not "loaded" by the weight of the vehicle, which makes it difficult to pull it back to disengage it. The weight of the vehicle and severity of the incline come into play here, as they add to the amount of loading. The length of the trans shift arm provides either more or less leverage, making movement either easier or more dificult...so there is a variable between vehicles for all of the different reasons above.
Every owners manual will contain instructions to use the parking brake on hills but don't explain why...now you know. Parking against a curb, you are loading the lock mechanism from the steering side which is why you should avoid parking like that.
Long answer to an easy question but that's how it works!!!
Posted on May 25, 2009
do you use parking brake? If so it sounds like it might be stuck. Try going in reverse and apply and let off e brake a few times.
Posted on Mar 30, 2010
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