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Oil Pressure Diagnosis and Testing

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Oil Pressure Diagnosis and Testing

Step Action Yes No
DEFINITION: Low or no engine oil pressure indicates a potentially serious condition with all of the engine mechanical components. Once the cause of the low or no oil pressure condition has been identified, repair all collateral damage to the engine mechanical components as well as the initial cause of the condition.
1 Check engine oil level. Use only the GM service parts brand and recommended grade of engine oil specified for the vehicle.
Is the engine oil level between ADD and FULL on the oil level indicator?		 Go to Step 2  -
2
  1. Operate vehicle until engine reaches normal operating temperature. Refer to Engine Mechanical Specifications .
  2. Park vehicle on a level surface.
  3. Wait (15 minutes).
  4. Check engine oil level. Use only the GM service parts brand and recommended grade of engine oil specified for the vehicle.
Is the engine oil level between ADD and FULL on the oil level indicator?		 Go to Step 3  -
3 Operate the engine and measure the engine oil pressure with the vehicle gage or light. Refer toEngine Mechanical Specifications .
Is engine oil pressure within specification?		 System OK Go to Step 4 
4
  1. Remove the oil pressure sender or engine block oil gallery plug.
  2. Install a mechanical oil pressure gage.
  3. Operate the engine and measure the engine oil pressure with the mechanical oil pressure gage. Refer to Engine Mechanical Specifications .
Is engine oil pressure within specification?		 System OK Go to Step 5 
5 Change the engine oil and filter.
  • Use only the GM service parts brand and recommended grade of engine oil specified for the vehicle. Refer to Owners' Manual.
  • Use only the GM service parts brand and recommended type of engine oil filter specified for the vehicle. Refer to Owners' Manual.

Operate the engine and measure the engine oil pressure with the mechanical oil pressure gage. Refer to Engine Mechanical Specifications .
Is engine oil pressure within specification?		 System OK Go to Step 6 
6
  1. Inspect the engine for mechanical damage. Special interest should be shown to the following areas:
    • Malfunctioning oil bypass valve
    • Oil pump worn or dirty
    • Oil pump-to-engine block bolts loose
    • Oil pump O-ring damaged or missing
    • Oil pump to oil pump pipe and screen assembly gasket missing or damaged
    • Oil pump pipe and screen assembly restrictions or damaged
    • Oil pump driven gear damaged or loose
    • Oil pump drive gear damaged
    • Oil cooler restrictions
    • Oil cooler O-rings damaged or missing
    • Excessive bearing clearances
    • Cracked, porous or restricted oil galleries
    • Oil gallery plugs missing or incorrectly installed
    • Damaged or missing oil spray cooling nozzles
  2. Inspect the engine for customer modifications.
Is there mechanical damage, or customer modifications to the engine?		 Go to Step 7  Go to Step 1 
7 Repair or replace all damaged or modified components.
Is the repair complete?		 Go to Step 1  -
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