i have a 99 civic ex with a b16a swap and a p28 ecu i welded in a cat cause it didnt have one when i bought it. but when i took it to get emissions the guy said that the swap and and obd1 ecu in my car was illegal. and refused to run it. after doing some reading i still havent been able to come up with an answer on how to make it pass. the dizzy and injector clips have all been converted to obd1. what is the easiest way to get this thing to pass emissions? is there an obd2 ecu that will plug right up? id like to keep the p28 in the car cause its alread chipped and i jst put cams and flat valves in it.

 

Your car originally had a D16Y8 engine and an OBD2b P2P ECU. You have installed an older engine and an OBD1 ECU that can't pass.

 

i don't know where you live, but in ohio there is an emissions repair cap. spend $300 on emissions related parts (converter, etc) and you get passed on a waiver. with what you've done to the engine, i dont think youll pass emissions with any obd-2 ecu.

 

he has obd1 ecu. He probably doesn't have the other emissions needed modules he also needs the secondary o2 sensor as well.

 

the cap here in georgia is ridiculous. i havent had the car long im not sure what measures the previous owner made for emissions. could i just plug up a p2t in from a 99 si and try to fool them into thinking its just an si with a b16a2. really im just asking what ecu i can just plug in and will run my motor without being chipped i just need it to be obd2 for emissions. also ive heard of an immobolizer being in those ecu's is there a way to bypass the feature?

 

What year b16 do you have? If it's a 99-00 b16a2 and you get a em1 ecu and related emissions parts you'll be ok.

 

i mean you can run a b16 on a y8 ecu. what im saying is that you dont have any of the appropriate sensors an obd-2 ecu will look for. you will not pass emissions with mil codes for emissions related parts.

 

Run a DOHC engine with an OBD2 SOHC ECU? How is this done?

 

it will run. ive also run an obd-1 b16a with a p28. is it ideal? no. will it run? yes. it doesn't matter either way, the car will not pass with any obd-2 ecu

 

Problem is you'll have to add a few things to get the check engine light to go away (EVAP items, CKF, secondary 02). And how they knew you had an older engine is beyond me unless you went to a real repair shop. Back when I did swaps I always went to the most mechanically ignorant ones I could find that could sell me the least amount of "fix" items as upsells (wipers, bulbs, etc), mostly it was gas station oil change places (no offense to those guys but normally all they do is oil changes, flushes and wipers).

 

P2T ecu and the necesarry emissions stuff.

 

i dont know about a dohc on a y8 ecu. its a jdm b16a not an a2. im not sure what exact year it is. so p2t it is. now what all sensors will the obd2 ecu be looking for and how do i wire them in or is there a way i can by-pass them in the ecu. and i just put skunk2 flat valves and bc stage 2 cams in it with a new cat. will it pass even after i fix the cel codes?

 

All they test for in Goergia for OBD2 vehicles is no CEL, monitors ready/set, a peek under the car for a cat. and the fuel cap for leaks.

They don't check what year the engine is or if it's a domestic version.

I've been in Ga. for the last couple of years so I'm speaking form experience. There are emissions "drive throughs" that take less than 10 minutes if everything is in order.

You would need to run a P2T or an OBD2A P30 with a conversion harness. Add a secondary O2, knock sensor (if you don't have one) and the CKF or try the hit or miss CKF bypass.

 

how do i wire these in? will i have to buy the sensors and run wires all the way to the ecu and install pins? my knowledge of wiring isnt very deep

 

If you have the original Ex engine and chassis harness you shouldn't need to wire anything in, it's all there already. You just need to add the needed sensors. The CKF will require an obd2 oil pump unless you try to bypass it.

 

i just put the motor back in i dont want to take the bottom end apart again to replace the oil pump. i just found a thread on how to bypass all the codes i should see for a little over 50 bucks its a temporary fix but thats all im looking for. thatnks for the ecu help

 

Without an OBD2 ECU you won't pass, period. They're going to connect to the DLC plug and an OBD1 ECU won't communicate with the scanner used.

You're going to have to use an ODBD2B or OBD2A ECU with conversion harness with the associated sensors for the readyness monitors to set (part of what they look for) to pass. The only work around you have is the CKF bypass keeping you from replacing the oil pump.

http://ff-squad.com/technet/ckftrick.htm

 

this

 

right, ive got it figured out. a p2t ecu will plug right up to my harness since its an obd2 ecu and my 99 civic has an obd2 harness. as for the codes that the ecu will give me theres a quick splice method to piggy back the CKF wires to the CYP wires to trick the ecu. ive read of an o2 sensor simulator that wires into your harness but im haveing trouble finding one so i guess ill just have to wire the second o2 sensor in which isnt a big deal and might actually be cheaper. as for the knock sensor i can use a piezo transducer from radio track for like 2 bucks. this wires into the d6 pin wire and to a chassis ground then mounted to the fuel rail loosely should create enough vibration to push enough current to trick the ecu without having to use two transducers. boom emissions tackled. as long as these cams dont bite me in the *** and i have to tare it down and re install the stock ones.

 

Give it a go, all that can happen is a fail and a retest. The CKF and KS piezo bypass are both hit or miss.

As long as you have no CEL's and the monitors set you'll pass in Ga.

 

how are they hit or miss? is thee a certain way to make them work?

 

Get some progress going and report back, no use waiting for us to reply back. You already know what you need.

 

will do

 

ok so i plugged in the p2t and it gave me 4 codes. the knock sensor, the ckf sensor. and o2 sensors 1 and 2 for some reason. i cleared the codes and unplugged the first o2 sensor and plugged it back in and wired in the ckf sensor. i started her back up and it gave me two codes the knock sensor and o2 sensor one. any idea why its still giving me the upstream o2? as far as i know the 2nd o2 sensor is wired into the cab harness and comes through the floor. the plug i have the first o2 sensor into is connected to the engine harness.

 

What is the exact o2 sensor code?