The light for the four wheel drive flashes for my four wheel drive but wont engage

SOURCE: four wheel drive wont engage

If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion. You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.

The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.

If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.

So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
Thanks for using FixYa - a FixYa rating is appreciated!!

SOURCE: four wheel drive wont engage

I fought with this problem every year since I had the Sportage. And it was so frustrating to find out just when you really needed it, that you did not have 4-wheel drive. I replaced the hubs with manual hubs and I wish I would have done it at the beginning. They work great and are 100% reliable. Bottom line.. the vacuum hubs were a great idea that just plain did not work reliably. Save yourself alot of grief and money and just replace the hubs. Less than $200 including paying someone to put then on and I now can rely on my Sportage when I need it.

SOURCE: 2000 Mitsubishi Montero 4 wheel drive indicator light flashes

get oil changed in gearbox and the switch on the box

SOURCE: four wheel drive does not engage. Turn switch on..

check the solinoid on the front driveshaft or on the transfercase make sure it is engaging if it is then the gears in the hubs are shot

SOURCE: Four wheel drive wont engage. Tranfer case is

Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace