[exalteduser]

94 blazer
4.3 multiport or whatever its called, NOT tbi

this truck has the push button 4x4 on the left side of steering wheel.
Something is amiss...

1. if in park, nothing happens either button
2. if in drive nothing happens either button
3. if in neutral, push 4hi then both lights flash a few times(hear a click like a relay somewhere) and then lights shut off. sometimes both will stay on but no 4x4 engage.

4. in the above method if i get both to light up, from there i can hit 4lo and i feel it lock in at the hubs, and 4 lo will work. only after messing with 4hi first. sometimes i cant get it back out of 4 lo right away.


I have heard everything from vacuum lines under the battery to modules and everything in between.
what i do know is it will lock in to 4lo with a little patience.

Previous owner mentioned that he would unplug battery for 5 minutes and then 4hi would work. i didnt try it exactly that way but i did try after i had it disconnected one time and still no go.

So i dont really know where to start, since it will work *sometimes* i feel like its a electrical or computer issue.

Thoughts, suggestions, Solutions, All welcome.
Thanks