My Civic was diagnosed with a blown head gasket a few months back and I decided the prudent thing to do was replace the engine. The garage I had do it charged me $700 (ended up $1100 due to needing a radiator and motor mounts) but it started having issues even before I picked it up. After they got it put together the check engine light came on as well as the blinking D in drive. According to him both seemingly transmission related and they couldn't figure out why. He said he filled the fluid (I do however need to double check that). When I picked it up it drove horribly and had nearly zero acceleration. All that said, the engine itself seems to purr like a kitten. I'm only a few blocks away or I wouldn't even have wanted to drive it. So here I am $2350 into it and have it home but still don't want to even drive it. Mr. fix it man says I'll need to take it to a transmission place as they don't have that skill. First off, to ME it makes zero sense that it's the actual transmission as I've never had the slightest issue and the fluid is very clean and it only started after the engine swap. He mentioned that it could be that the computer needs to be reset or something? Any and I mean ANY help or advice here appreciated. This all feels like a bad dream today. I was so excited when he called and said it was ready and that elation lasted maybe half an hour until I drove it. Thanks!

Edited to add: He mentioned that the engine was very slightly different than the old one with less (or maybe more) cables somewhere

 

Based on a bit of research this evening I feel strongly that the car is in "limp mode" which I had zero clue existed before today and am assuming the issue is something related to a sensor, wiring or possibly the brain. He mentioned swapping the computer out and that it was a bit different than the original one??

 

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