Assistance required: D16Y4 EK HATCH - B16A2 EM1 COUPE ENGINE TRANSPLANT

[blastnpast]

:honda:Reason for thread: Having issues after conversion and have not solved them seeking advice.

The specs: swapping my D16Y4 out of EK1 HATCH for a B16A2 out of an EM1 COUPE.

The questions:

-Is there any wiring issues which need to be swapped out?
-Is there any additional sensors which needs to be taken into consideration to re-wire them in?
-Has anyone encountered any issues with this exact transplant

Current issues:

-I have converted my EK Hatch (d16y4) into an EK Hatch with a b16a2 from an EM1, i have an idle issue atm and it is causing many problem such as when idle the rev's fluctuates in between 1,500-2,600 and performs this action constantly when driving the car doesn't jerk just revs at 2,600 when clutch is engaged. If the engine is restarted the car's idle changes and fluctuates from 1,500-2,100 also when driving the car Jerks when light acceleration is applied or when releasing accelerator. No check engine lights are evident.

Actions taken already to try resolve this issue:
-Swapped out intakes now run CAI
-Idle screw has been adjusted
-TPS has been readjusted
-Crome ECU installed and O2 Sensor disabled (This step Removed the CEL CODE FOR O2 SENSOR)
-Cleaned throttle body and inspected all vacuum hoses for leaks
-Swapped EM1 Engine harness and now use EK4 Harness
-Swapped out alternator plug as the alternator was suited to the EM1 B16 3 Pin plug

Any advice would be greatly appreciated-Know anyone who can help location is SYDNEY

[bennjamin]

Swap ek4 ecu to see if it stabilisers the issue
You need a o2 sensor to run / stable idle too

[blastnpast]

Swap ek4 ecu to see if it stabilisers the issue
You need a o2 sensor to run / stable idle too

Thanks for the prompt reply mate, I cant run an EK4 ecu unfortuately my harness doesnt seem to suit the plugs, confusing as it seems.. so because im not running that o2 sensor could this be causing the issue even tho it is disabled from ecu?

[Tai]

Pre face lift EK = OB2A and face lift = OBD2B

You need a wiring conversion harness if you EK4 ecu is pre face lift with your EM1 wiring.

[blastnpast]

Pre face lift EK = OB2A and face lift = OBD2B

You need a wiring conversion harness if you EK4 ecu is pre face lift with your EM1 wiring.

Thanks for the Info Tai, I was able to run a b18c7 ecu without using a conversion harness and when I used that the car would idle high at around 2,700 but from memory it wouldnt fluctuate like the Crome ecu I'm running now however the revs would lag when coming off the gas and placing it in neutral for e.g set of lights the light goes green so I chuck It in neutral and begin slowing down however my revs were stuck at whatever I had placed it in neutral then when come to a complete stop the revs would begin to lower to an idle of 2,600.

Is this easy to understand fellas or would you guys want some more documentation?

[blastnpast]

Swapped out my Crome
Ecu for a b18c7 one which fit and worked. The idle issue is not apparent and it returns to 1,300 after acceleration is dropped however a new issue has raised with using this ecu.


Copied from new post in technical section

(Installed b18c7 standard ecu into my EK with a b16a2 drives well however when first start up I get no CEL codes and the car takes longer to return to idle once placed in neutral after accelerating but when I turn off and start back up a CEL code is up (02 sensor) and the car drives normal with the revs returning to 1,300 when placed in neutral my questions are :

-How come the CEL code doesn't pop up right away on first start up?

-after driving without the CEL why do the revs take Longer To get back down to idle?

-when driving with the CEL how come the car drives normal and revs are brought down as soon as acceleration is released?)

[TbM]

dunno much about the o2 sensor but id be thinking the o2 cel may not be showing up for a while because they need to get to operating temprature before they work so when your car/o2 is cold it will run in open loop, then once you have gotten the car up to temp it tries to go into closed loop and notices your sensor is not working properly and reports the cel.

I dont think your meant to run a b18c7 ecu on a b16a2 i was under the impression you need to match your ecu to your engine so wouldnt you need to use a late model ek4 ecu?

[blastnpast]

dunno much about the o2 sensor but id be thinking the o2 cel may not be showing up for a while because they need to get to operating temprature before they work so when your car/o2 is cold it will run in open loop, then once you have gotten the car up to temp it tries to go into closed loop and notices your sensor is not working properly and reports the cel.

I dont think your meant to run a b18c7 ecu on a b16a2 i was under the impression you need to match your ecu to your engine so wouldnt you need to use a late model ek4 ecu?


Lol yeah ek4 ecu's don't seem to fit :/ in the harness but the b18 one fits straight in lol not sure and I have fitted a d16 series thermostat which I have heard won't allow the car to reach normal operating temp as it needs to be 190 degree however the car is only reaching 150 degree at normal operating temp with the d16 thermostat

[TbM]

If they dont fit then you probably need a conversion harness like Tai said,

Pre face lift EK = OB2A and face lift = OBD2B

You need a wiring conversion harness if you EK4 ecu is pre face lift with your EM1 wiring.
The b18c7 one probably fits because its the same obd gen as your harness were as it would seem the ek4 one you have isnt.

Are those temps the readings from a water temp sensor or what the thermostat is rated at? and what measurement Fahrenheit or celsius?

[blastnpast]

If they dont fit then you probably need a conversion harness like Tai said,

The b18c7 one probably fits because its the same obd gen as your harness were as it would seem the ek4 one you have isnt.

Are those temps the readings from a water temp sensor or what the thermostat is rated at? and what measurement Fahrenheit or celsius?

Should be in celsius and I was told the thermostat was staying on 150 not rising when it should rise to 190 etc

When the conversion was done we used an ek4 harness to install as the em1 harness needed the chassis harness to be swapped over so instead of getting an em1 chassis harness we just used an ek4 harness

Does this make
Any sense or does it sound like a b18c7 harness was used instead of ek4 harness lol can anyone scope out ecu model numbers compared to years or provide pics of ecu's and their connection style for me

[TbM]

If those are temp readings in celsius from a sensor then you have big problems. Im thinking they are the opening temps in fahrenheit not a reading from a sensor.

Are all the parts used from a facelift model? eg ecu harnesses and engine, i was under the impression they all had to be from the same obd series

[blastnpast]

If those are temp readings in celsius from a sensor then you have big problems. Im thinking they are the opening temps in fahrenheit not a reading from a sensor.

Are all the parts used from a facelift model? eg ecu harnesses and engine, i was under the impression they all had to be from the same obd series

I dont see why all parts had to be facelift lol I have an em1 engine b16a2 with an ek4 engine harness and am now using a b18c7 ecu lmfao

And as for readings I had it plugged into my ecu and connected to a pc and it was reading 150 maybe farenheight I'll ask

[TbM]

well my understanding is that you need to have all obd2a(preface) or all ob2b(facelift) parts for it to be compatibale and plug in right or you need conversion harnesses and such if you have unmatching parts which is why im asking if its all from a facelift as im pretty sure you said you have a late model b16a2 so i would think you need a late model harness and late model ek4 ecu for the ek4 ecu to plug in but as ive said tho i dont know much about ecus and conversions so could be wrong.

It would have to be farhenheit if its the reading or you coolant would be boiling all over the place at 150 celsius. 150 F is about 66 celsius which is quite low, normal operating temp is about 80-90 ish IIRC. Might be using the ECT to bump up the idle still at the temp ill see if i can find any info in my manuals on what temp it stops using the ect. The thermostat controls the minimum operating temp so if you give it a bootful you will still be able to get it up to normal operating temp.

[blastnpast]

well my understanding is that you need to have all obd2a(preface) or all ob2b(facelift) parts for it to be compatibale and plug in right or you need conversion harnesses and such if you have unmatching parts which is why im asking if its all from a facelift as im pretty sure you said you have a late model b16a2 so i would think you need a late model harness and late model ek4 ecu for the ek4 ecu to plug in but as ive said tho i dont know much about ecus and conversions so could be wrong.

It would have to be farhenheit if its the reading or you coolant would be boiling all over the place at 150 celsius. 150 F is about 66 celsius which is quite low, normal operating temp is about 80-90 ish IIRC. Might be using the ECT to bump up the idle still at the temp ill see if i can find any info in my manuals on what temp it stops using the ect. The thermostat controls the minimum operating temp so if you give it a bootful you will still be able to get it up to normal operating temp.


Thanks for this in regards to this I have swapped out alternators which was the only plug which did not suit my b16a2 Dude so I have all the correct parts and everything is connected lol I am just gonna take it to a mechanic for full inspection tomorrow

[TbM]

but arnt you running a b18 ecu instead of an ek4 ecu because the ek4 ecu wont plug in to your current harness? Im thinking some of your setup is obd2a and some is obd2b as an obd2b harness wont plug into an obd2a ecu and vice versa.

[ECU-MAN]

if he is running crome then he is OBDI

ensure you have chosed the correct ROM as well, as if you have rich or lean idle mixtures you can find the engine will hunt

[blastnpast]

if he is running crome then he is OBDI

ensure you have chosed the correct ROM as well, as if you have rich or lean idle mixtures you can find the engine will hunt

Yeah I had a Crome
Ecu with a conversion harness to run it and recently had to trash the Crome
Ecu as It burnt out... It sucks ass paid $350 for it plus tune lol it never ran right and always hunted but with the b18 ecu I am
Running now the car doesn't hunt etc my car is totally weird

[Benson]

Does it run normal now with the B18c ECU?

[blastnpast]

Does it run normal now with the B18c ECU?

It was running ok except when it gets warm the revs stick at 3,000 when clutch Is engaged then slowly decreases and sits as 1,500 rpms with no CEL on but on second start up when engine is still warm CEL code is alight and the car runs normal idles at 1,000 rpms and decreases revs when clutch is engaged

[ECU-MAN]

Yeah I had a Crome
Ecu with a conversion harness to run it and recently had to trash the Crome
Ecu as It burnt out... It sucks ass paid $350 for it plus tune lol it never ran right and always hunted but with the b18 ecu I am
Running now the car doesn't hunt etc my car is totally weird


I can fix it for you if you like.