so basically i picked up a 99 ek coupe with a b20b4 in it the motor is obd2a and the ecu is obd2b. i found a obd2a p2e ecu could i just use that one and it will work? and what kind of harness would i need or would it just be easier to get a jumper harness?

 

A P2E ecu will not work as it is a Single cam ecu. It may run the motor, but not correctly. What ECU is in the car now? you could just buy an ECU jumper from OBD2b chassis to OBD2a ecu

 

the ecu in the car is the factory 99 civic ecu a obd2b

 

but if i got a jumper harrness it would need to be obd2b to obd2a correct? as the motor is obd2a

 

you could just run an LS P75 ECU, whether, and get a jumper if it's OBD2a like I stated before. OR you can go on a site like www.phearable.net/ and get an OBD1 ecu with a B20 base map, and convert your motor to OBD1

 

what obd is the p75?

 

i actually think i will just order the ecu than you for your help

 

You'll want a 96-99 integra p75 with a jumper harness as the 00-01 P75 has the immobilizer if you plan on staying OBD2.

 

do you think a p72 would work?

 

but then id need to take care of the vtec huh hmmmmmmm

 

No it'll throw codes for VTEC, knock and just isn't tuned for the B20. I believe you can also use a 99-01 CRV manual ECU as well.

 

thank you for your help im going to try and source a p75

 

another question please help. i have everything i need becides this wiring stuff. so if my ecu is obd1 and my motor is obd2a i need to get a harness for the ecu to obd2a correct? do i need another harness for the engine to the ecu? or the distributor? just very confused on all this please help

 

Are you going to use an OBD1 ECU? If so you'll just need the OBD2B to OBD1 ECU adapter and the OBD1 P75 ECU and you'll be done.

 

yes i am trying to source a p75 ecu and ill wait until i get one to get it all put together just seems it would make more sense to do it that way rather then try to cut a corner. im guessing when you said obd2b you ment obd2a? and by adapter you meen jumper harness correct thank you again for your help saves me a headache ive done most the research myself i just want to make sure i get the correct ecu and wiring.

 

a p75 can be obd1, obd2a, or obd2b.

To run an obd1 p75, you'll need an obd2b to obd1 jumper harness.

 

ok so i think im starting to under stand all this now the jumper harness more or less just plugs into the ecu correct? and since the original ecu is obd2b i would need a jumper harness from that to whatever obd my ecu is?


theres a wire that connects to my distributor that i think i would need to source some kind of new one not really sure so i will take pictures now and post
again thank you

 

again thanks for help as this is my first swap (we all have to start some where)
i think one of them is called the ivac? not to sure and im not really sure what the other one is either and some one said it might be easier if i just get a ls intake?

 

^

 

The distributor connector won't be plug and play. You're going to need to rewire the connectors or use an adapter harness. The black plug by the intake manifold post the wire colors because it could either be the intake air temp sensor or the EVAP purge plug. The round sensor on the intake manifold is the IAT sensor and you'll either have to swap to a round connector or use your current cars intake sensor and drill a hole in your intake arm to make it work. For any other connectors you aren't sure about post the picture and the wire colors.

 

sorry been working alot and havent had the time to do this will get it done tommrow when im off
thanks again

 

i apologize again to anyone following or helping me on this thread i work monday through friday 12:00 midnight to 8:30 and its kickin my ***. but i have been doing a little more research when i got free time and would a pr4 ecu work? and i am going to for sure get these pics posted tommorow sometime or today if i still cant pass out lol

 

i took a picture of everything that wasnt hooked up and i ordered a p75 ecu and got the jumper harness

 

 

also the harness coming off the distributo has 9 pins but looks like its missing one. the one going to it has 8 i looked on rywire and they only have 10 pin to 8 pin am i missing one or do some come with 9?