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Re: 1986 blazer w-4.3 4x4 not working help please snow on the way
ok, first off, the light your talking about isn't a reliable piece of info. but i know what your saying. if the front driveshaft is spinning it just means the the transfer case is succesfully engaged in 4x4, but your front axle isn't engaging....the problem here is normally the vacuum switch on the top of the transfer case (drivers side with 3 vacuum lines going to it) it is approx $55 CDN, the only other thing in the circuit is the actuator located under the battery box, it is what the vacuum switch activates. so what i'm saying is that if you remove the battery box (5 bolts) then shift it into 4x4 you should see this actuator operate....it is almost identical to the actuator used for most cruise control units, just a diaphram (sp?) with a cable attached to it. if you don't see any movement in this unit then i would safely say it's the vacuum switch, but....if there is a rip in the diaphram then it will leak air aswell. if you remove the vacuum line off the actuator and see if it's got vacuum in it, then this will isolate the problem for you. hope that helped, let me know.
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1991 Chevy S-10 Ext. Cab
4X4, 4.3L TBI V6.
-Competition Camshaft, Ported Heads, Bored .40 Over,
Completely Rebuilt (everything), Roller Lifters, K&N Filter,
MSD Wires, Jet Performance Chip, B&M Shift Kit,
AirRaid TBI Spacer, 3:42 Posi Trac, 2" Lift,
American Racing Wheels, BFG All Terrain Tires
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1986 blazer w-4.3 4x4 not working help please snow on the way
thanks
