Unless someone posts a reply to the contrary, you can expect a pile of modifications. The engine computer will be different, possibly the wiring harness, possibly the fuel pump / system if the engines require different fuel pressures.
The AC compressor might mount differently as well as the alternator and power steering pump. A larger engine will often use a larger radiator and different exhaust system. The exhaust pipes could be larger and the connections to the exhaust manifolds could be in different positions and angles.
You're better off looking for the correct engine from a salvage yard. My students worked on a small Buick front wheel drive car a few years ago. It originally had a 1.8L engine, as I recall, but someone had installed a 2.0L. The cooling system never worked right and the engine finally overheated one too many times. We wanted to put a 1.8L engine back in. By the time we found the proper engine computer, mounts, and wiring, and all the other little stuff, we had more in it than the car was worth.
I put a 3.0L engine in a Caravan too. It was the right engine but one year newer. The newer engine no longer used an ambient air temperature sensor, but that sensor was needed by the computer, so it's flopping around on top of the engine to this day! That's a minor difference. You can expect major differences when going to a different engine size.
Friday, February 5th, 2010 AT 10:13 PM