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4 Wheel Drive/SUVs/94 s10 blazer 4wd is stuck on

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Expert: - 9/22/2007


Question
ok i have a 94 s10 blazer and the 4wd comes on and off, it is electronic and the 4hi light is on, it seems to engage only when the egr valve acts up because the egr is bad, now it also mainly makes the noise and vibrations from the passenger side of the truck, it just had the driver side hub replaced and both front cv axles replaced about 3 months ago, i was curious if the switch on the transfer case was bad? or someone said pull the fuse so 4wd wont come on at all? can you tell me what fuse it is? thanks -nick

Answer
Nick,

The EGR valve should have nothing to do with your problem.  This valve is an exhaust gas recycling valve that has to do with your smog system.  The transfer case and drive system is completely separate from your smog control.

The noise and vibrations could be coming from your front axles, or the transfer case/transmission.  It is extremely hard on the drive train when you drive in 4-wheel drive on hard surfaces.

It sounds more like you have a bad ground, bad wiring or a faulty switch.  This needs to be taken care of asap, before something major breaks in the drive train.

I would purchase a repair manual for the Blazer at a local auto parts store.  They cost around $20 and are needed for most home repair or trouble shooting.  This manual will give you step by step instructions along with photos of the fuse locations, and information/trouble shooting the transfer case problem.

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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