okay so i have a 91 ef i bought it with a b18a1 i recently put a b20b in it im using a b18a1 intake manifold and a pr4 ecu im not sure whats going on with the wiring due to the previous owner converting it or doing something to the wiring for the b18a1 there is a total of four wires leading from two injectors a blue on and a brown one and then another two leading to the distributor these four wires are then directly wire into the ecu to yellow and green wires.

please help me figure this out and if there isnt any thing that i can do to get the b20 to run with the pr4 ecu im willing to buy another uncut harness and ecu but id like to fix it.

if you know what your talking about and would like to walk me through it that would be great call or text me at 61four 7three2 nine125

i really need help thanks a lot
austin

 

bump i know someone knows whats going on with this

 

Did you reuse your B18A1 harness with the new B20B?

 

jesus i had to read that like 3 times to try to understand what your saying. what obd is your ecu? your obviously multi port since you had an LS. i have a b20 as well as crvtec tim. were also both converted to obd1 i believe so i can help out if you let me know what obd your running and what harness you used.

 

thats your injector wiring. you should have a blue and a red coming FROM the injectors. those 2 wires should be run to the ECU.
the brown wire should have been wired into your original harness into your two yel/blk wires from your old injectors.

as for the two wires coming from the dizzy that is your cylinder position sensor and your cylinder crank position wires. that should be directly run to the ECU

 

running an obd0 pr4. as for the question about the harness im guessing its the stock ls one with a mpfi conversion. im guessing because i didnt do the b18a1 swap i bought it swaped.
im good will tools just not wiring it all just slaps me and makes me scratch my head. im really looking from answers from guys that have done b20 swaps guys that know there wiring ****.

 

im obd1 and didnt do the conversion myself so i cant help but im sure tim can

 

All your answers are here...

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/88-91-crx-ef-civic-frequently-asked-questions-faqs-1508680/

This is nothing special - all the hard work was done for you if there was a B-series already in it. There is surely nothing special about a B20 swap either... You don't even have to get in to wiring in any VTEC stuff. What exactly are your concerns? You just listed there are some extra wires... And? There are supposed to be. What exactly are you getting at?

 

thanks billnye

 

You forgot to add "The Science Guy". Jeez, do I have to do everything?

 

ohh my bad lol