I am putting a B18A1 LS swap in my 91 ef i was told that i need a jumper harness is this true can someone help !!!

 

you should search it up, because you're not giving us a clue what year model ef you have, you can use your stock harness, if you have an Si model than it should just plug and play, if you have a dx model you're going to need to do the dpfi into mpfi conversion.. try the search button there are answers every where.

 

If you are going to run the motor as obd1 then u need a ecu jumper harness. The b18a1 is an obdo motor you just slap it in and go if you have an si

 

The EF is a 1991 si and the motor is a 1992 integra LS 'DA' what i understand is that the stock harness in the ef will plug up to my da computer! correct!!!!