Is the Jeep 4.2 a good motor?
The 4.2 is a solid engine as well and as you said at a less horse power than the 4.0. The number of miles the engine can get on it is based on proper service on both models. The major difference between the two is the 4.2 is carbureted and the 4.0 is fuel injected. Both has it’s own problems.
Why did Jeep stop using the 4.0 engine?
The Jeep 4.0L went the way of all old-design inline engines. It can’t be cleaned up to current emission standards without an unacceptable loss of fuel economy.
How long does a Jeep engine last?
Jeep models are known to last well over 100,000 miles. A well-maintained Jeep Wrangler can last for up to 400,000 miles. Most cars start having serious problems at 100,000 miles. A normal car can last a long while if the owner takes decent care of it.
What is the average life of a Jeep engine?
The straight engines, either the 2.5 or 4.0 have very long life spans, taken care of they are a half million mile motor with common life times of over 300,000mi.
What is the most reliable Jeep engine?
The 4.0L engine is likely the best known of all the Jeep engines ever produced. By the time it was discontinued in 2006 more than 7 million units had been sold worldwide and many owners have reported driving more than 300,000 miles without having to rebuild their 4.0L Jeep engines.
Are all Jeep 4.0 blocks the same?
Not all 4.0 engines are the same even after 91 and up. You should be ok with the 99Cherokee to 99 Grand Cherokee swap though. Be careful, many people assume that they are the same but they are not.
How many cylinders is a 4.2 engine?
The 4.2-liter engine is an inline six-cylinder (I-6) and is powered by regular gasoline. It has 24 valves–four valves per cylinder–and they are in a double-overhead-cam (DOHC) configuration. This means that there are two camshafts and they sit on the top of the cylinder head.