ej6-b16

i have recently converted my ej6 coupe obd2b from 1.6 straight to a obd1 b16a2
but i have it wired to a obd2a itr ecu with the origional obd2b harness and it is not running right and i got cel codes 20 21 and 41 it sounds as if it is running on 3 cylinders but when it warms up it runs perfect at idle but if i put it under load it splutters and dies
so i am fairly stumped now and its a jdm engine and jdm ecu if that helps.

ej6-b16

any help welcome and greatly appreciated

carlos8

Code 41 = 02 this can be your sputtering

code 20 = ELD your car is EDM so maybe isn't equipped with it.

code 21 = I believe is VTEC spool valve (but been both engine and ECU JDM) you should not have problems. Maybe from obd2b to 2a some wire need to be relocated at ECU plug. (someone else can chime on this).

94EG8

22 is vtec pressure switch not ELD, the other codes are correct though.

B serious

iTrader: (1)

VTEC pressure switch most likely just needs a ground. B16A2's only came in OBD2 cars IIRC. Either way, OBD1 or OBD2 engine itself doesn't matter in this case.

I'm assuming you mean that you have plugged the ITR ECU into your OBD2B harness using a conversion sandwich harness?

Check to see that your conversion harness doesn't have broken connections.

Does your car have an ELD? Did you wire the O2 in properly?

None of those codes really explain the sputtering. A car will run in open loop just fine without an O2 sensor. When you start the car, it is in open loop.

Did you replace the spark plugs? Wires? Distributor cap and rotor?

carlos8

True!! he said 20 and I write 22

ej6-b16

i will be replacing plugs and distributor and wires on tuesday and thanks for the help i have checked and all grounds are good and i spliced the wires to the new ecu and tomorrow i will check over it to make sure i didnt make any mistakes

HondaPartsHero

Just curious which wiring harness did you use? And is the engine USDM B16A2 or other?

ej6-b16

i was using the origional harness for the car and wired in the vtec to a switch as i has a 1.5 sohc vtec in it before i put the b16 in so its ukdm which would be the same as edm harness and the engine is jdm and the ecu is jdm

doctorake

You are running the wrong ECU for that engine. Your wiring situation is hard to figure out, please post clearly how it is wired and any other pertinent information.

purgat0ry

iTrader: (3)

This, I've been wracking my brain to figure out why you're using a B18c5 ECU on a B16a2, needless to say, they're VERY different engines.

No, this wont improve anything it'll just run like ****

B serious

iTrader: (1)

Actually...an ITR ECU would probably be a decent match to make power on a slightly modded B16. It also raises the rev limit to 8700 (JDM ITR), which is useful for a car with a narrow powerband.

ej6-b16

the ecu is mapped for the engine and sorry i just realised you only get all the codes when you have the car running and i got 2 extra codes it was 3 which i think is map sencor and 14 which i think is iacv so i think these are the main problems and will be changing them out tomorrow night and i will post up how it turns out with a set of new plugs also

HondaPartsHero

I didn't think you could chip/map an OBD2 ECU? Also make sure you don't have connectors swapped as the MAP sensor and TPS are the same plug. Also if your engine is OBD1 the IACV is on the manifold and uses a different plug style than the OBD2 engine. You may need to put the obd2 IAT in your intake arm or swap to a round style obd1 connector and use the intake manifold one.

doctorake

You can't map an obd2 ecu, get the right one.

ej6-b16

I have the connectors correct and i think the previous owner of the engine had already tried to go obd2 because it already has an obd2 iacv and you can map an obd2 ecu you just cant chip it i think its the map sencor that is the main problem if i am correct as when it is under load the car just ***** itself and dies

purgat0ry

iTrader: (3)

You've got numerous issues compounding into one.
Wrong ECU
Hacked up conversion
Bad wiring.

Start at one place and work forward, don't attack it from a different angle each day.

Pick an ODB version and stick with it.

ej6-b16

i just want it to run properly as there is a track day coming up at the end of the month and this is my track car i am getting map sensor and iacv today i can also try to get the o2 sensor my freind has a crashed accord 99 would they be interchangable ??

doctorake

So if you remapped it I assume you mean you swapped out the MCU? Which one are you running? did you mess with any of the tables or are you running a stock one?

ej6-b16

my sponsors mapped it on a b16a2 they are lz tuning

tony_2018

hack job on the harness is going to cost you, running an obd2 ecu on an obd1 motor isn't hard but there are things to consider converting.

doctorake

So confused.

94EG8

That old hack doesn't actually work. It will activate the vtec solenoid but it doesn't add the extra fuel or change the timing so you don't really make any power in vtec.

OBD1 and OBD2 B-series IACVs are all the same. You can't chip or map or do anything at all with an OBD2 ECU other than run a vafc and an adjustable fuel pressure regulator which as an ancient hack that is at best a poor substitute for real tuning.

What I'm getting from all this is you're running the original harness with the ECU plugs chopped off and OBD2A plugs spliced on. Get a new OBD2B Civic harness (preferably for a B16, but lesser trim levels will work, as long as it's not for a 1.4L SFI setup) Use a B16A ECU, run a conversion harness if required.

ej6-b16

i will get a new harness on tuesday but the only problem is immobliser on obd2 ecus as the jdm itr didnt get an immobliser until obd2b the obd2a dosent have an immobliser but all obd2 ecus have immobliser here as im in ireland

94EG8

Get a JDM OBD2A P30 and a conversion harness or get a US/Canadian P2T ECU, that's probably the best option, proper B16A ECU, it's already OBD2B so no need for a conversion harness and no immobilizer.