I have a 2001 Chevy Blazer 4.3L 4wd which I just replaced the intake gasket on, and I have a coule more bugs that I would like some help with.
First of all, I would like to know if there is anyone who could tell me where the Grease Zerk fittings are located. Second, When I push my button to engage the 4WD I am hearing grinding, and the 4WD will not engage, is there anyone that might be able to tell me where to start diagnosing this problem?

 

there are a total of 11 fittings on the blazer the first six are on the steering knuckle.(i.e. upper and lower ball joints and the tie rod ends) the lower ball joint fitting should be on top of the ball joint which might be hard to see right under the axle boot. you might have to dig in through some old grease to find it. now if you follow the tie rods there is a grease fitting on the other end of each side.( to get these you need to turn the steering a bit to make space)thats 8. now follow what the tie rods connect to there are two grease fittings facing down one on each side. they are at the steering gear pitman arm and idler arm. the last one is hard to find because you have to remove the plastic cover where the oil filter is. once you remove the cover you should see it at the other end of the idler arm.
as far as the 4x4 goes, start by checking the fluid levels at the transfer case and front differential. to do this you remove the plug which fits a 3/8 ratchet, stick your finger in the hole and the fluid level should line up with the whole. if it is okay then you can check the computer for any codes. i.e.for auto 4x4 you need a scan tool, but for regular three button 4x4 you can use a jumper wire to get flash codes. if n e ?s please reply