2.4. What tools are needed to remove crank sensor?

behind the engine crankshaft pulley. remove belt. remove center crank nut with an air tool. crank pulley/balancer should come off with a little persuasion. the crank sensor is located behind and straddles a tone wheel.

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.

Loss of spark is the common reason on this year of buick, that means you either have a defective Crankshaft position sensor or a defective Ignition control module, either one can cause the symptom. Of the two parts the crankshaft position sensor is the most common failure point, to replace it you must remove the front crank pulley and the harmonic balancer behind that pulley, the crank sensor is behind that and is triggered off the harmonic balancer. You access the pulley through the passenger wheel well, you must remove the plastic or rubber splash guards to access it, you will need some special tools, a harminic balancer pulley puller of course will be required. There is also a special tool needed to set the air gap from the sensor to the pulley, so to get around that tool measure the old sensors air gap with a feeler gauge and set the new one the same.

thats corret replace crank postion sensor and cam postion senosr as they both cause hard start and no start situations the cam sensor is very easy to change crank sensor needs to have harmonic balancer pulluy removed and then remove sensor and reinstall new sensor easy but you need a removal tool and install tool for that pully can be rented at autozone its free its just a depostit i hope it helps


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1. Disconnect the negative battery cable.
2. Disconnect the electrical connector at the sensor.
3. Using a 28mm socket and pull handle, rotate the harmonic balancer until any window in the interrupter is aligned with the crank sensor.
4. Loosen the pinch bolt on the sensor pedestal until the sensor is free to slide.
5. Remove the pedestal to the engine mounting bolts.
6. While manipulating the sensor within the pedestal, carefully remove the sensor and pedestal as a unit. To install:
   
7. Loosen the pinch bolt on the new sensor pedestal until the sensor is free to slide.
8. Verify that the window in the interrupter is still in the correct place.
9. Install the sensor and pedestal as a unit while making sure that the interrupter ring is aligned within the proper slot.
10. Install the pedestal and tighten the engine mounting bolts to 22 ft. lbs. (30 Nm).

3X Sensor

1. Disconnect the negative battery cable.
2. Remove the sensor harness connection to the sensor. Fig. 1: Unsecure the harness, then unfasten the bolt to remove the CKP sensor
   
   
3. Unsecure the sensor block bolt.
4. Remove the Crankshaft Position (CKP) sensor from the vehicle. Inspect the O-ring for cracks and replace if needed. To install:
   
5. Install the new O-ring if needed and lubricate with engine oil.
6. Install the sensor into the hole in the block.
7. Install the mounting screw and tighten to 71-88 inch lbs. (8-10 Nm).
8. Attach the sensor harness connector, then connect the negative battery cable.

Dual Crank Sensor Sections 3 and 4 of this manual also cover testing, removal and installation, and adjustment of many computer controlled components.

1. Disconnect the negative battery cable.
2. Remove the belt(s) from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. Remove the right front wheel and inner fender access cover.
5. Remove the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer.
6. Disconnect the sensor electrical connector.
7. Remove the sensor and pedestal from the engine block, then separate the sensor from the pedestal. To install:
   
8. Loosely install the crankshaft sensor to the pedestal.
9. Using tool J-37089 or equivalent, position the sensor with the pedestal attached, on the crankshaft.
10. Install the pedestal-to-block retaining bolts. Tighten to 14-28 ft. lbs. (20-40 Nm).
11. Tighten the pedestal pinch bolt 30-35 inch lbs. (3-4 Nm).
12. Remove tool J-37089 or equivalent.
13. Place tool J-37089 or equivalent, on the harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly. NOTE: A clearance of 0.025 in. (0.635mm) is required on either side of the interrupter ring. Be certain to obtain the correct clearance. Failure to do so will damage the sensor. A misadjusted sensor of bent interrupter ring could cause rubbing of the sensor, resulting in potential driveability problems, such as rough idle, poor performance, or a no-start condition.
    
14. Install the balancer on the crankshaft. Install the balancer retaining bolt. Tighten the retaining bolt to 200-239 ft. lbs. (270-325 Nm).
15. Install the inner fender shield.
16. Install the right front wheel assembly. Tighten the wheel nuts to 100 ft. lbs. (136 Nm).
17. Lower the vehicle.
18. Install the belt(s).
19. Reconnect the negative battery cable.

24X Crank Sensor

1. Disconnect the negative battery cable.
2. Remove the serpentine belt from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. Remove the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer.
5. Disconnect the sensor electrical connector.
6. Unfasten the sensor bolts, then remove the sensor. Fig. 2: The 24X crankshaft sensor is secured by two bolts
   To install:
   
7. Install the crankshaft sensor to the engine with the two mounting bolts. Tighten the bolts to 8 ft. lbs. (10 Nm).
8. Attach the electrical harness to the sensor.
9. Using tool J-29113 or equivalent, install the harmonic balancer to the vehicle.
10. Apply a thread sealer such as GM 1052080 or an equivalent to the threads if the crankshaft balancer bolt, then tighten the bolt to 110 ft. lbs. (150 Nm).
11. Lower the vehicle.
12. Install the serpentine belt.
13. Reconnect the negative battery cable.
    

Is this a V6 or 4cyl???>>>(V6) This requires removing the Harmonic balancer (crankshaft pulley). Remove (R) front wheel, remove engine splash Guard, Remove crank pulley, remove lower timing belt cover. The Crank sensor is located behind the crank shaft pulley!! I highly recommend having this done by a certified tech, requires special tools. Hopefully this helps!!

Not on the 3.5l LX5. The crank sensor on that engine is near the starter.

1991 Buick Rivera only came with a 3.8L engine known as the 3800
The crank sensor is behind the Harmonic balancer / Crank pully. Special tool required to remove pully without damageing it. once pully is off the crank sensor is held inplace by 2 bolts.

You will need a puller. Try autozone loan a tool.

you will need to remove the starter to gain acess to the ckp sensor. once you remove the starter look on the engine block and you will see the sensor. The only problem with doing this repair yourself is that you will not be able to preform the crankshaft position variation learn procedure with out a factory scan tool. The vehicle may crank an run, but the timing advance curves will be wrong so the vehicle will probably cut off every time you remove your foot from the gas pedal. Hope this info helps!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jonathan_3a3c556b4b17d1d2