OIL PRESSURE WARNING LIGHT ON AT IDLE - D.I.C.

MODELS AFFECTED: 1987 CIMARRON WITH U52 ELECTRONIC CLUSTER

Some 1987 Cimarrons equipped with electronic instrument clusters (RPO U52) may experience a flickering oil pressure warning light at idle condition. This condition may occur even though the oil pressure gauge is operating correctly.

A flickering warning light may be caused by an oil pressure sending unit having a high trigger point mated to an oil pressure warning light having a low trigger point.

To repair this condition, perform the following steps:

1. Remove the oil pressure switch, located at the RH rear of the engine next to the thermostat housing. Install a 0-60 psi external oil pressure gauge. With engine running at operating temperature, verify proper oil pressure as the flickering oil pressure light appears.

- If oil pressure is below 6 psi at idle, an oil system low pressure condition exists. STOP. The remaining steps will not correct a low oil pressure condition. Refer to the Service Information Manual and appropriate Serviceman Bulletins for assistance in correcting this condition.

- If oil pressure is above 6 psi at idle, reinstall the oil pressure switch and proceed to step 2.

2. Raise the vehicle on a hoist. Refer to the Service Information Manual for assistance.

3. Remove the oil filter.

4. Remove the oil filter to engine block adapter.

5. Remove the wiring connector from the oil pressure sending unit.

6. Using a 30mm open end wrench, remove the oil pressure sending unit from the block.

7. Reverse the above steps to install a new sending unit, P/N 10068576.

8. Check for oil leaks and proper oil level.

PARTS REQUIRED:

10068576 Oil Pressure Sending Unit 14056403 Oil Filter Adapter Gasket 14033233 Oil Filter Adapter Bolt Seal (if required)

For warranty purposes, use Labor Operation T6259 at 0.6 hour for oil pressure test and sending unit replacement.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.