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Most Common Jeep Liberty 3.7 Engine Problems

Most Common Jeep Liberty 3.7 Engine Problems

Jeep is a prominent company based on creating and manufacturing automobiles and has risen to popularity quickly. Jeep has consistently brought out newer and better models throughout their survival, specializing in SUVs or sport utility vehicles.

The Jeep Liberty is a sleek and compact SUV that rocked the automobile industry from 2002 onwards till 2007. The design was put forward in 1998, while the Jeep Liberty was introduced in 2001. Sales of the vehicle were highest during 2002, followed closely by 2004, racking up over a hundred thousand sales each year.

Even so, the Jeep Liberty was equipped with a 3.7L engine that is extraordinarily efficient and worthy for the most part. However, there have been slight issues with the Jeep Liberty 3.7 Engine that did not go unnoticed by the users. Throughout the rest of the article, let’s explore the most common Jeep Liberty 3.7 Engine problems.

About The Jeep Liberty 3.7 Engine

More commonly known as the PowerTech engine, this one is an integral part of the Jeep Liberty builds. At the start of its use, the 3.7L Engine was just for the Jeep Liberty SUVs, which brought the Engine into the limelight. The engine is built for powerful performance by offering a staggering 210 horsepower at 5,200 RPM.

The addition of a split-pin crankshaft makes sure that problems you might have with vibrating cease to exist. The 3.7 Engine is a great option to have as the main Engine of your utility vehicle. Nevertheless, we ought to clarify some common issues in the following section.

Commons Problems With Jeep Liberty 3.7 Engine:

 It is no surprise that the 3.7L is a great engine to have at bay, but there might be some issues with it that can stir up confusion and anger among the consumers:

1. Problematic Valve Seats

All intake valves and exhaust have to be appropriately sealed, and the valve seats in the Engine handle this matter all too well. Operation of the valve seats ensures enough cylinder compression at all times in the vehicle.

Without proper compression, the cylinder is practically useless. Thus, a damaged valve seat may lead to a malfunctioning cylinder, ultimately severely impacting the vehicle’s actual performance. Engine overheating is the most common cause of lousy valve seats, and the 3.7 has always been troublesome while handling extra heat.

Stutters while acceleration, unexpected power loss, engine misfires, etc., are some everyday events in case of valve seat failure. We advise you to check on them regularly to avoid any issue with the 3.7 Engine valve seats.

A probable solution is to check the Engine regularly and avoid overheating Engine. This will help keep the valve seats unharmed.

2. Lash Adjusters Issues

 There must be a lack of clearance between the valve and the cam follower. In an engine such as the 3.7L, the engine’s lifters are absent. The presence of the lash adjusters successfully takes care of the job performed by the lifters.

There are not many things that might be wrong with the lash adjusters as it accounts for such a small part of the Engine. Unfortunately, due to some common buildup problems, lash adjusters can get stuck and harm the performance of the 3.7 Engine.

The main reason behind this issue is all about oil. Sludgy or thick oil may cause the adjuster to come off and malfunction. Problems with the vehicle’s acceleration, noises from the Engine, etc., are some of the common symptoms of the issues with lash adjusters.

We propose you get the replacement adjuster if one of them fails miserably, putting you in a pickle.

3. Piston Ring Issues Are More Common Than You Think

Common knowledge about the Engine is that the cylinder wall should be protected from touching the piston. That is precisely the job of a piston ring. If the piston ring job fails, there is a chance of a massive engine failure.

The piston ring on the 3.7 Engine has a problem with the design that makes them produce too much heat, ultimately damaging parts such as the cooling systems, valves, and the shaft. Oil burns very quickly, thus needing more fuel and, as a result, wasting resources.

This is not that common a problem, and the easy way to avoid it is to check on the rings regularly and try to keep them as cool as possible.

4. PCV Valve Ceases To Work

 A PCV Valve is needed to let all the exhaust gases from the engine through to the atmosphere. Failure in the service of the PCV Valve can lead to poor engine performance, the buildup of oil that later turns into sludge, leakage of the valve cover, and way too much fuel requirements.

Toxic fumes are often given off when there is a problem with the PCV. Slight stops during acceleration are also a common thing to notice when the PCV valve has issues.

Delectably, there is an easy way to alleviate this issue, and that is by purchasing and replacing the PCV Valve altogether.

Also read: Top 3 Jeep Liberty Years to Avoid

Pros and Cons Of The Jeep Liberty 3.7 Engine

Enough of the problems with the Jeep Liberty 3.7 Engine! Let’s know the positive sides of the engine, along with a few dark sides of it.


  • Compact design to maximize efficiency.
  • High power engine for extreme performance.
  • Replacement of the parts is not so costly.
  • Durable for a significant amount of time.


  • Problems with the valve seats.
  • Issues with the lash adjusters.
  • Piston rings might malfunction abruptly.
  • The PCV valve might deteriorate and need replacement.

Final Verdict

There are certain anomalies with all good things in life, and that’s the exact case with the Jeep Liberty’s Engine, also known as the 3.7L. It is always a great comfort to know about all the pros and cons of an engine before you decide to purchase a vehicle, and this article has most of the information you need to make a decision. Apparent advantages to specific disadvantages: the call is yours to make!

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