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I don't know what to do. I just replaced the engine in my car with a '95 1.8L and it eats gas like crazy. The engine only has 105,000 kms on it and my old engine had over 300,000 kms. The old engine was great on gas. Any ideas?

I've read that o2 sensors can have a big impact on your gas mileage just something to think about...

you just used a 95 engine in a 92 car? correct me if im wrong but isnt the setup on the car ODB1 and the engine ODB2? will the ecu in the car make the engine run weird?

I asked the exact same question, but the mechanic said as long as they use the '92 wiring harness and exhaust manifold, it would be fine. As for my o2 sensors, they are only 1 year old. I'm still a little worried about the engine because my check engine light comes on all the time.

did he plug everything in properly? in one of the engines theres an extra plug from what i've been reading on here

what's the code the engine check light is on for?