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Hi new to the forum. In 2 weeks I'm going to be swapping my engine in my 2004 civic dx. I bought a 2005 d17a1 engine complete with wiring harness so it should be plug and play. Just want to make sure because I'm doing the swap 500 miles from home where my car broke down and don't want to run into anything major. Is their any thing I should watch out for while swapping the auto tranny.

 
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I would suggest getting rid of the engine harness from the replacement and using the stock one from your car. Do both engines have EGR?

 
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And how do i tell?

 
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So the new engine doesnt have egr but the old one does. Is this hard to deal with

 
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If the original engine does not have EGR but the new one does you will need to swap the coolant passage/EGR manifold along with a new intake manifold gasket. This also means you will need to use the original engine harness and not the one from the new engine. Other than that I believe this will be a direct swap.

 
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The old engine has egr but the new one doesn't.

 
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make the new engine look like the old one, use the old harness

 
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It doesn't appear I can read very well. Just reverse what I previously said. It really is as easy as making the new look like the old as Colin states.

 
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And is it true the engine from an se is different and can I tell what model of car this came out.

 
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The only difference is EGR and/or VTEC, there should be a vin plate on the engine somewhere, if you can decode that you'll know what kind of car it came out of