I removed the harmonic balancer bolt, but cant get pulley off.

First, you have to loosen the crank pulley center bolt. Best way is with an impact gun-bolt is very tight. If you have to use a breaker bar to loosen the bolt, you will have to devise a way to hold the crankshaft from turning backward while loosening it. One method is to remove the starter and wedge a piece of wood against the flywheel, preventing it from turning, while you are loosening the center bolt.
From the beginning: raise and block the side of car that the front of engine is towards. Remove the wheel and the inner fender splash shield. Remove the belts. Remove negative battery terminal, remove starter. Wedge the flywheel so it won't turn backward. Loosen and remove the center bolt. Some harmonic balancers will slide right off the crankshaft now, some are on very tight, if you can't wiggle it, tap it, and get it to move, then buy an inexpensive harmonic balancer removal puller, just a few bucks, easy to use, will save balancer from trying to hammer it off. All you need is enough room to mount up the puller to the balancer, and get the balancer moving off the crank.
Some engine lay outs there isn't enough room: then you really have to get creative, either lowering engine enough to get to pulley, or raising engine out. But most engines are positioned where the crank pulley can come off easily, with enough room to get the puller on.
The pulley may have a woodruff key in a slot on the crankshaft, and a corresponding notch on the pulley, for proper positioning of the pulley to crank. Don't lose the woodruff key.

Did you take out the center bolt? You have to remove the center bolt, then use a harmonic balancer puller. Not the two or three armed pulley puller, but a harmonic balancer pulley puller-the pullers with jaws that hook around the outside of pulley can ruin a harmonic balancer.
Use the impact gun to remove the center bolt. You won't need an impact gun to remove the balancer pulley. The balancer puller will take it right off the crankshaft, no problem.

To get to the sensor, the harmonic balancer pulley on the crankshaft has to be removed. The center bolt on the harmonic balancer is on very tight. To loosen without an impact wrench, remove starter motor and wedge a piece of wood against the flywheel, or use a pry bar and hold the ring gear on the flywheel rigid, while loosening the crank bolt. The engine will try to turn backward when you loosen the crank bolt, so you have to hold the flywheel rigid. Once the bolt is removed, see if you can get the harmonic balancer pulley off without a gear puller. Just try tapping it to see if it slides off, or use two screwdrivers on each side behind the pulley and see if you can start it sliding off. If it is on very tight, as many are, you will have to get hold of a harmonic balancer removal tool-a simple, inexpensive puller that bolts onto pulley and can be drawn off. You might be able to rent the tool too.
BTW, you will need to have the wheel removed from passenger side, and the inner fender cover removed to get to the crankshaft. Once the pulley is off you can unbolt the sensor and put the new one on. GM recommends using a sensor alignment tool to install, because the thin vanes on the back of the harmonic balancer pass through the sensor, and if not aligned right could damage one or the other. If you don't have the tool, put the sensor on loosely mounted, just snugged up finger tight, then test the pulley will slide through the sensor slots without touching either side of sensor. If it looks right, tighten down the sensor in place, install the harmonic balancer pulley and tighten the center crank bolt to about 105 foot pounds.
Wedge the flywheel again so the engine won't turn when tightening the crankshaft bolt.
Good luck, and hope you get it.

If you are talking about the harmonic balancer pulley bolt it will be done up to around 195 ft/lb torque. It is best to use a 1/2 '' impact gun to remove the bolt.

the garage may have did something to the crank position sensor that is located behind the harmonic balance. there is a ring gear there to for the timing

Before you change anything,,check and see if everything is in line..Also feel all the pulleys and make sure everything turns ok...If the powersteering pump has been replaced,,sometimes the pulley was not pressed on far enough..If it seem to be the harmonic balancer make sure its not damage and the bolt in the middle is tight...If you remove it..You remove middle bolt,,then you have to use a puller to remove the harmonic balancer itself..unusuall for the harmonic balancer to be bad unless it was hit by something

Hi,
The sensor is located to the right of the crankshaft behind the vibration dampner (harmonic balancer). You will need a balancer puller and a special tool to space the new sensor correctly.
(can be done also with eye spacing, but the tool is recommended to ensure proper spacing as to prevent damage to new sensor and / or harmonic balancer.) You will also need a strap wrench to hold balancer pulley in place while removing and re-installing balancer to crankshaft bolt. (helper required)

Procedure for replacement:
Remove negative battery cable.
Set parking (emergency) brake.
Release tension on serpentine drive belt and remove belt from harmonic balancer pulley. ( large pulley at bottom of engine)
Break loose lug nuts on passenger side front tire, do not remove bolts yet.
Raise and support vehicle on passenger side, remove wheel.
Remove plastic splash guard (cover) from passenger side wheel well.
Remove dampner / balancer center retaining bolt (counterclockwise, it is torqued very tight.) Use a strap wrench around pulley and have a helper hold that in place while using a 1/2" breaker bar and socket to turn pulley bolt out of crankshaft. Be careful not to rotate engine in a counterclockwise direction while breaking the bolt loose.
Using balancer puller, remove dampner / balancer pulley from engine.
You will now see the crank sensor to the right of the crankshaft bolted to the timing cover.
Disconnect sensor wiring and remove retaining bolts, remove sensor.
Put new sensor in place and screw in bolts, do not tighten them yet.
Reconnect wiring to sensor.
Now use special tool to properly space sensor. If you cannot find one at the parts store, you can space the sensor with the balancer pully held in place (not installed yet) and space the sensor evenly with the veins on the hub of the balancer pulley. Take your time and be sure it is as evenly spaced as possible.
Tighten sensor bolts.
Clean balancer hub free of any oil and dirt deposits using brake or carbeurator cleaner.
Reinstall balancer to crankshaft by tapping around the inner surface of pulley with a rubber hammer.
It is a press fit, so be sure you have it started evenly and progress slowly in a circular motion to ensure you are keeping it aligned straight with the crankshaft.
Reinstall balancer bolt using the same method as removal, torque bolt to 110 foot pounds, then tap around balancer again twice with rubber hammer, turn the engine 2 full revolutions clockwise using the balancer to crankshaft bolt, then tighten bolt an additional 1/4 turn.
Replace splash guard, put wheel on tightening lugs to finger tight and then wrench tight in a star pattern.
Lower vehicle until wheel makes contact with floor, tighten lug nuts to 115 foot pounds in a star pattern using a torque wrench.
Fully lower vehicle, remove jack.
Re-install serpentine drive belt
Re-connect negative battery cable.

End of procedure....Hope that helps!.....Mike

CRANKSHAFT PULLEY IS THE HARMONIC BALANCER.YOU NEED THESE TOOLS TO REMOVE HARMONIC BALANCER, YOU NEED HARMONIC BALANCER REMOVER AND INSTALLER TOOL.YOU NEED A LARGE PIN SPANNER WRENCH TO HOLD HARMONIC BALANCER IN PLACE WHILE LOOSEN THE HARMONIC BALANCER BOLT.

go get a harmonic balancer puller from parts store and follow instructions on box. will come of a seconds

just a socket set will do the job.But remove the bolt and put thread lock-tight on the threads and tighten to manufacturers toque