1991 Ford Explorer Is Leaking Oil

Common Causes of Oil Leaks in Your 1991 Ford Explorer and How to Fix Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a 1991 Ford Explorer is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 1991 Ford Explorer is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What steps should I take to diagnose the oil leak in my 1991 Ford Explorer?

To effectively diagnose the oil leak in your 1991 Ford Explorer, begin with a systematic approach that prioritizes simplicity and thoroughness. Start by locating the leak; check beneath the vehicle for any visible oil spots or puddles, which can provide initial clues about the source. Next, inspect the engine components, focusing on areas like the oil pan, valve cover gaskets, oil filter, and oil drain plug for any signs of leakage. It's also crucial to check the oil level in the engine, as a significant drop may indicate a more serious leak. Pay special attention to the oil filter, as a damaged or improperly installed filter can lead to leaks. Additionally, examine the oil pan for cracks or loose bolts, and assess the condition of the valve cover gaskets, which can deteriorate over time. Don't overlook other potential sources, such as oil cooler lines and seals. Finally, before starting your vehicle, clean the engine area to help identify the leak's exact location once the engine is running. By following this diagnostic approach, you can efficiently pinpoint the issue and take the necessary steps to resolve the oil leak.

What are the common causes of oil leaks in a 1991 Ford Explorer?

When diagnosing oil leaks in a 1991 Ford Explorer, it's crucial to understand the common problems that may be at play. One of the primary culprits is a worn or damaged oil pan gasket, which can deteriorate over time due to exposure to heat and engine vibrations, leading to leaks. Additionally, the valve cover gasket is another frequent source of oil leaks; if it becomes worn or cracked, oil can escape from the engine, creating a mess and potential engine damage. Another area to inspect is the oil filter; if it is loose or damaged, it can result in significant oil leakage. Furthermore, engine seals, such as the rear main seal or camshaft seals, can wear out, allowing oil to seep out. Lastly, don’t overlook the oil drain plug; if it is loose or improperly installed, it can also lead to leaks from the oil pan. Addressing these issues promptly is essential for maintaining your vehicle's performance and preventing further damage, making regular inspections and maintenance a vital part of vehicle care.

How urgent is it to address the oil leak in my 1991 Ford Explorer?

Addressing an oil leak in your 1991 Ford Explorer is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. Ignoring an oil leak can lead to severe consequences, including engine damage due to insufficient lubrication. Oil plays a vital role in keeping engine components functioning smoothly, and a leak can result in increased friction, which may ultimately lead to costly repairs or even engine failure. Furthermore, a loss of oil can cause the engine to overheat, posing a serious risk of permanent damage. Beyond mechanical issues, oil leaks can create hazardous conditions, as oil dripping onto hot engine parts can ignite and lead to a fire. Therefore, it is essential to prioritize the repair of any oil leaks to ensure the safety of both the vehicle and its occupants, as well as to maintain the longevity and performance of your Ford Explorer.

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1991 Ford Explorer Oil Leaking Issues & Repairs | RepairPal