Engine - Noise/Misses/Stalls/Runs Rough/Low Power

Article No.
96-21-3

10/07/96

^ MISSES - STALLS - RUNS ROUGH - REDUCED POWER - METALLIC "TICKING" NOISE FROM HYDRAULIC LASH ADJUSTERS - 2.0L ENGINES BUILT THROUGH 5/17/96

^ REDUCED POWER - MISSES - STALLS - RUNS ROUGH - METALLIC "TICKING" NOISE FROM HYDRAULIC LASH ADJUSTERS - 2.0L ENGINES BUILT THROUGH 5/17/96

^ RUNS ROUGH - STALLS - MISSES - REDUCED POWER - METALLIC "TICKING" NOISE FROM HYDRAULIC LASH ADJUSTERS - 2.0L ENGINES BUILT THROUGH 5/17/96

^ STALLS - RUNS ROUGH - MISSES - REDUCED POWER - METALLIC "TICKING" NOISE FROM HYDRAULIC LASH ADJUSTERS - 2.0L ENGINES BUILT THROUGH 5/17/96

^ ENGINE - METALLIC "TICKING" NOISE FROM HYDRAULIC LASH ADJUSTERS - STALLS, RUNS ROUGH, MISSES AND/OR LACKS POWER - 2.0L ENGINES BUILT THROUGH 5/17/96

^ NOISE - METALLIC "TICKING" NOISE FROM HYDRAULIC LASH ADJUSTERS - STALLS, RUNS ROUGH, MISSES AND/OR LACKS POWER - 2.0L ENGINES BUILT THROUGH 5/17/96

FORD:
1993-96 PROBE

This TSB article is being republished in its entirety to revise the service procedure and include the latest level parts.

ISSUE:
A metallic "ticking" noise may be heard at idle and may be accompanied by concerns of stalling, rough running, missing and/or reduced power. This may be caused by an uneven wear pattern on the oil pump control plunger resulting in air entrapment within the lubrication system causing the hydraulic lash adjusters to bleed down. The oil pump plunger also can stick, causing the hydraulic lash adjusters to pump up and the cylinder head valves to stay open.

ACTION:
Replace the oil pump. The revised Oil Pump (F72Z-6600-AA) has an improved oil pump plunger to reduce the possibility of air entrapment within the oil pump. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

LASH ADJUSTER BLEED DOWN DIAGNOSTIC PROCEDURE

1. Run engine at 4000 rpms for 5 minutes or until oil temperature reaches 99°C (210°F).

2. Turn the engine off and let stand for 5 minutes.

3. Start the engine and let idle for 10 minutes.

4. If a metallic "ticking" noise is present, replace the oil pump. Refer to Section 03-01A of the appropriate year Probe Service Manual for replacement procedures.

5. If the "ticking" noise is not present, the oil pump is not the cause. Refer to the appropriate year Probe Service Manual for further diagnosis.

STICKING OIL PUMP PLUNGER DIAGNOSTIC PROCEDURE

1. With the engine cold, install Engine Oil Pressure Gauge (T73L-6600-A), or equivalent, and Transmission Test Adapter (D870-77000-A), or equivalent.

2. Start the engine and run at 3000 rpms while monitoring oil pressure.

3. The oil pressure should be below 689.5 kPa (100 psi) and drop to below 551.6 kPa (80 psi).

NOTE:
OIL PRESSURE WILL CONTINUE TO APPROACH NORMAL SPECIFICATION RANGE AS ENGINE TEMPERATURE INCREASES. OIL PRESSURE SPECIFICATION AT NORMAL OPERATING TEMPERATURE AND 3000 RPMS IS 393-489.5 kPa (57-71 PSI).

4. If oil pressure is above 689.5 kPa (100 psi) and remains high during warm up, replace the oil pump. Refer to Section 03-01A of the appropriate year Probe Service Manual for replacement procedures.

5. If oil pressure is within specifications, refer to the appropriate year Probe Service Manual for additional diagnostic procedures.

PART NUMBER PART NAME

F72Z-6600-AA Oil Pump
JE10-40355 Exhaust Manifold Nut
F2O1-40352 Exhaust Clamp
99946-0800 Nut
F42Z-6626-A Oil Pump Inlet Tube Gasket
F32Z-6B652-A O-Ring
F6AZ-19562-AA Silicone Gasket And Sealant

OTHER APPLICABLE ARTICLES: NONE

SUPERSEDES: 94-12-7

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

962103A Replace Oil Pump 3.7 Hrs.

DEALER CODING
CONDITION
BASIC PART NO. CODE
6600 30

OASIS CODES: 497000, 499000, 607000, 607400, 607700, 608000, 608400, 608500, 609000, 609400, 609500, 613000, 613500, 614000, 614500