Oil consumption high Toyota Corolla

High oil consumption in a Toyota Corolla E170 (2013-2019) can be attributed to several factors. This guide will provide a comprehensive approach to diagnosing and addressing the issue.

Step 1: Verify Oil Consumption

1. Check Oil Level:

   • Tools: Shop rag, flashlight.
   • Allow the engine to cool down.
   • Remove the dipstick, wipe it clean, reinsert it fully, and remove to check the oil level.
   • Record the oil level and condition (color, presence of debris).

2. Service History Review:

   • Examine previous maintenance records to ensure consistent oil changes with the correct grade of oil.

Step 2: Visual Inspection

1. Inspect for Oil Leaks:

   • Tools: Flashlight, inspection mirror.
   • Look for oil stains or wet areas around the valve cover gasket, oil pan gasket, and around the oil filter.
   • Check under the car for oil spots.

2. Check PCV Valve:

   • Tools: Pliers, screwdriver.
   • Locate the PCV valve, typically on the valve cover.
   • Remove and shake it; a rattling sound indicates it's functioning. If clogged or dirty, replace it.

Step 3: Compression and Leak Down Test

1. Compression Test:

   • Tools: Compression tester, socket set.
   • Remove the ignition coils and spark plugs.
   • Insert the compression tester into one cylinder at a time, crank the engine, and record the pressure.
   • Compare readings across all cylinders. Low compression in one or more cylinders could indicate worn piston rings or cylinder wall issues.

2. Leak Down Test:

   • Tools: Leak down tester, air compressor.
   • Bring each cylinder to TDC (Top Dead Center) on the compression stroke.
   • Attach the leak down tester and pressurize the cylinder.
   • Listen for air escaping through the intake manifold, exhaust, or crankcase, indicating valve or piston ring issues.

Step 4: Inspect Engine Internals (if necessary)

1. Endoscopic Inspection:
   • Tools: Inspection camera/endoscope.
   • Insert the camera into the spark plug holes to visually inspect the cylinder walls for scoring or excessive wear.

Tools Required

• Shop rag
• Flashlight
• Inspection mirror
• Pliers
• Screwdriver
• Compression tester
• Leak down tester
• Air compressor
• Inspection camera/endoscope
• Socket set

Repair Instructions

If Oil Leaks are Present:

1. Replace Faulty Gaskets:
   • Identify the leaking gasket (e.g., valve cover gasket, oil pan gasket).
   • Remove the affected components and replace the gaskets.
   • Clean the mating surfaces thoroughly before installing new gaskets.

If PCV Valve is Faulty:

1. Replace PCV Valve:
   • Remove the old PCV valve.
   • Install a new PCV valve ensuring a tight fit.

If Engine Internals are Worn:

1. Piston Ring Replacement (Major Repair):

   • Requires engine disassembly.
   • Remove the cylinder head and oil pan.
   • Remove pistons and replace the rings.
   • Hone cylinder walls if necessary to ensure a proper seal.
   • Reassemble engine components with new gaskets and seals.

2. Consider Engine Overhaul:

   • If multiple cylinders show low compression or excessive wear, a full engine rebuild or replacement may be necessary.

Conclusion

High oil consumption should be addressed promptly to prevent engine damage. The above diagnostic steps and repairs should help in identifying and resolving the issue. If the problem persists, consulting with a professional automotive technician is recommended for further inspection and repair.