I had a 93 civic dx hatchback with a 94 jdm b18c. The dx harness was modified to be used on the b18 it ran fine. now i took the motor out and put the b18c with dx harness in a 92 civic si hatch and never touched the harness from the dx i wired in the v-tech and the other two wires in the same way it was in the dx and the v-tech works, but the engine runs terrible. no power below 2000rpm
I dont understand what it wrong and i cant get it to run right. someone told me i had to take out the dx harness and modifi the si harness and use that but i was planning on yousing that harness in the 93 dx. it seams like alot of work to take both harnesses off cut the plugs off the dx to put them on the si harness. is there another way?
what is wrong with my car?
Thank you

BTW i put the b18 in the si because the back of the dx was smashed and looked terrible and the si is clean (incase anyone was wondering why i would put my motor into a heavier car)

 

I don't believe you are having wiring issues unless you are throwing codes.

Make sure all your vacuum lines are properly in. as well as the TPS and the MAP sensor is not switched.

 

what poison said

if the power is lagging down low, check your ignition timing as well

good luck

 

What poison and hybrider93 said. Yup Yup

 

yeah, listen to VTECVillian and hybrider, they know their ****

 

Take your time on those nasty vacuum leaks. Go over everything thrice.