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Jeep Engine: AMC 150 I4
Publish date: Nov 1, 2005
By:  ORC STAFF
Source: Jeep at Off-Road.com

The 2.5L inline 4 (I4) engine used in Jeeps today was first introduced in '84 when Jeep was owned by AMC. Originally, the engine used a carburetor, later versions used throttle body fuel injection, and the current version uses multi-port fuel injection. The fuel induction has been the major change with this engine over the years. The 2.5L uses over head valves with hydraulic lifters and a cast iron block and cylinder head.

The current version of the 2.5L I4 engine uses multi-port fuel injection. This engine is the standard engine used in the Wrangler (TJ) and Cherokee (XJ). It was the standard engine in the Wrangler (YJ) since 1991. The XJ version of the 2.5L has a slightly higher output.

AMC 150 I4
Bore x Stroke3.88" x 3.19"
Displacement150ci (2.5L)
Compression Ratio9.1:1
Horsepower (net)123@5250
Torque (net)139@3250
Main Bearings5
Valve ConfigurationOHV
FuelMPI

The TBI version of the 2.5L was used in '87-'90 Wrangler YJs.

AMC 150 I4
Bore x Stroke3.88" x 3.19"
Displacement150ci (2.5L)
Compression Ratio9.2:1
Horsepower (net)117@5000
Torque (net)135@3500
Main Bearings5
Valve ConfigurationOHV
FuelTBI

This carbed version of the AMC 150 I4 was introduced as the standard engine in '84-'86 CJ-7s.

AMC 150 I4
Bore x Stroke3.88" x 3.19"
Displacement150ci (2.5L)
Compression Ratio9.2:1
Horsepower (net)105@5000
Torque (net)132@2800
Main Bearings5
Valve ConfigurationOHV
Fuel1bbl

Comments and questions from our Readers
Enrico / Sâo Paulo - Brasil, ZZ, BRAZIL
 Posted Dec 28 2007 08:29PM
I want to adapt an MPI sistem in my AMC 150 I4, actualy it is a brasilian version called GM151 year 86 Can you please give me advice on the parts i will need to buy and adapt? thanks in advance.
Bobby Johnson / Titusville, FL, UNITED STATES
 Posted Mar 05 2008 03:11PM
i have an 89 2.5 jeep motor i would like to do away with the T.B. fuel injection. due to the age of my jeep's wiring system and the fact i use it in a lot of water. i don't rock climb so running and strange angles won't cause a carbed motor to run bad. can someone please direct me towards a way to carb my motor. a few locals tell me you can't do it. any rock crawlers out there want a fi system mine works great help me out and you can have it. tks Bobby
ted / Cape Coral, FL, UNITED STATES
 Posted Sep 13 2008 05:38PM
i badly need a cooling diagram for a 1984 amc jeep 150 4 cyl cj7 im having serious cooling issues thanks alot for any help
punakev / Hilo, HI, UNITED STATES
 Posted Jan 28 2009 10:59PM
I have purchased a 89 wrangler with the 2.5... they changed it to a 2bbl carb with an adapter to the TBI intake manifold... I purchased a rochester monojet and a 84 intake manifold the jeep runs fine but under load it retards or someting and runs like shit... the distributor wires are not connected there are three of them. I also purchased an 84 distibutor but they look the same as what I got... The wiring has been all chopped up have isolater block, coil.. tried direct same result. Is this possibly a weak or intermittent spark? Timing is bouncing around... is the computer some how still connected to the motor? Does the module in the ditributor now need power or a controller? troubled in paradise slow goes it... Aloha
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