GM Storm/Spectrum 1985-1993 Repair Guide

Sending Units and Sensors

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For additional sensors not covered here, see Emission Controls of this repair guide.

REMOVAL & INSTALLATION



Oil Pressure Sensor

See Figure 1

The 1.8L engine is equipped with an oil pressure sensor, which is located in the rear of the block, directly to the left of the oil filter. The sensor is just behind the starter motor.

  1. Disconnect the negative battery cable, then raise and support the vehicle safely.
  2.  
  3. Remove 1 bolt and 1 nut retaining the starter, then carefully pull the starter motor away from the engine and position aside for access to the sensor. Do not let the starter hang by the electrical connections, if necessary, support the starter using a length of wire.
  4.  
  5. Unplug the sensor electrical connector.
  6.  
  7. Using a socket or wrench, back the sensor from the block.
  8.  

To install:
  1. Wrap the sensor threads with sealing tape, then install the sensor into the block and tighten to 10 ft. lbs. (14 Nm).
  2.  
  3. Install the wiring harness to the sensor connector.
  4.  
  5. Remove the support, then position the starter motor to the engine. If any shims were removed with the starter, make sure they are replaced in their original locations. Install the starter retainers and tighten to 29 ft. lbs. (39 Nm).
  6.  
  7. Remove the supports and carefully lower the vehicle.
  8.  
  9. Connect the negative battery cable and verify proper sensor operation.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Oil pressure sensor - 1.8L Storm engine

Power Steering Pressure Switch

See Figure 2

Some Storm models utilize a pressure switch which is mounted to the power steering pump and is designed to monitor hydraulic system pressure. The switch will signal the ECM when pressure becomes to great for the current engine speed. The switch will communicate to the ECM that idle speed must be increased, and if applicable, that the air conditioning compressor must be temporarily be shut OFF, to compensate for the high power steering pump load. This action will help protect the engine from overloading at low speeds.

  1. Disconnect the negative battery cable, then place a drain pan below the vehicle to catch any escaping power steering fluid.
  2.  
  3. For vehicles equipped with V-belts, loosen the power steering pump pivot bolt and adjuster bolts, then pivot the steering pump to release belt tension. Remove the belt from the pump pulley, then remove the pump pivot and adjusting bolts.
  4.  
  5. For the 1.8L engine, use a 3 / 8 in. drive socket wrench to rotate the tensioner pulley clockwise, releasing tension from the serpentine belt, then remove the belt from the pump pulley. Remove the 3 bolts retaining the power steering pump.
  6.  
  7. Position the pump for access to the pressure switch, but be careful not to kink or damage the fluid lines.
  8.  
  9. Unplug the switch electrical connector, then back the switch out from the pump assembly.
  10.  

To install:
  1. Install the switch into the pump and tighten to 124 inch lbs. (14 Nm). Connect the wiring harness to the switch, then reposition the power steering pump to the bracket.
  2.  
  3. For the 1.8L engine, install the 3 retaining bolts and tighten to 15 ft. lbs. (20 Nm). Loosen the serpentine belt by pivoting the tensioner using a ratchet and reposition the belt over the pump pulley. Make sure the belt is properly routed and seated in all its pulleys, then carefully rotate the tensioner back into contact with the belt.
  4.  
  5. For vehicles equipped with V-belts, install the pump retainers, but do not tighten fully. Position the belt over the pulley and properly adjust belt tension; refer to General Information & Maintenance of this repair guide. Once the belt has been properly tensioned, tighten the pivot and adjuster bolts to 11 ft. lbs. (15 Nm).
  6.  
  7. Connect the negative battery cable and remove the drain pan, then properly bleed the power steering system, refer to Suspension & Steering of this repair guide.
  8.  



Click image to see an enlarged view

Fig. Fig. 2: Power steering hydraulic pressure switch - Storm

 
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