Help Me get this BP running right

[pox]

My b6de had an egr. Just so ya know.

Also, the FPR can just get looped into the intake manifold, so you dont really need that solenoid. (having the solenoid helps fuel consumption though)

Let me get this straight, you have an OBD2 Engine with OBD2 sensors.
You have an OBD1 EGT wiring harness, VAF, and ECU.

May have to find obd1 sensors to connect to the obd 1 harness. Meaning your obd2 engine will be converted to obd1.

[RedBPmx3]

but DO i have an obd2 engine? LOL

I have no idea..

i only have one o2 sensor, albeit a 4 wire..

as for obd1 sensors IF i need them.. i've got 2 spare obd1 bp heads that still have everything attatched

im actually going to visually confirm wether the 1g sensors and harness plugs are the same as the 2g sensors/plugs.

if they are, i'll just pull all the 2g sensors that are impacted by the harness, and swap in their 1g counterparts with the 1g harness.

again.. the only crucial differences in harnesses i observed is 1) the distributor harness and plugs, the MAF and surrounding plugs, and the 3 extra plugs on the fuel rail harness that lead to the looped solenoids that i pulled.

does anyone know where i can find a vac diagram/egr diagram for the new gen bp??????
if the b6de had egr, and the new bp has egr, then correct me if im crazy, but cant i re-do the vac stuff for the egr like it was originally done on the b6de or this new gen bp? (i knwo it had normal vac stuff.. but the swappers made a mess of it.. and just ziptied it in a bunch off to the side) where can i find the egr on this new bp?
is it part of the intake manifold? If so, i could swap a 1g manifold that's egr-less maybe.

[pox]

viewtopic.php?f=3&t=60421&hilit=2nd+gen+bp

http://www.mx-3.com/phpBB3/viewtopic.php?p=379303

http://www.imazda.com/forums/showthread.php?t=733

Just trying to get you as much information as I can. Would you be able to contact rekognize to verify exactly the car and motor your car has? lol

I am unable to find any other BPs with the thing on the throttle body. It just looks like some sort of spacer to me.

[Limegreen mx-3]

To bad you don't live in TX.

[RedBPmx3]

To bad you don't live in TX.

why's that? lol

[Limegreen mx-3]

To bad you don't live in TX.

why's that? lol

Because am intrigue as to why it is not running the way you think it should. But lets face it with all the response's you have had is it running anywhere up to par. That's why I say to bad you don't live in TX I would just like to fix it just to fix it have another BP MX-3 on the road. We are a dying breed if you know what i mean. Over the help internet get's you no where.

[RedBPmx3]

Update: got a line on a 1995 Egt parts car
With ecu dist ign module and the whole
Wiring harness.

Can anyone confirm the sohc rs harness to
Work with a new gen bp?

Or is it pnp with an old gen bp?

Cause I'm almost at the point of considering
Selling the low mileage jap motor and
Just sourcing a 1g Bp to make everything easier
For myself.

[Dark_Rider2k3]

I'm here!!

I did the 2nd gen. BP swap in my MX. There were a few wiring issues that I had to tend with like you, and seeing as how you have pretty much the same motor as me (imported jap. motor) here is what I did to get her running right:

1. ECU: I used the "BPVR" ecu. Now, you don't have to use this ecu, but you need to use a BP ecu. Using the B6 ECU will make it run like s---/no fuel economy. The BPVR ECU is used with a 4-wire o2 sensor, though only one of the 4 wires goes to the ECU. It just reads the 4-wire better. I am using a 2-wire o2 at the moment which the BPVR can run as well, but I did notice using the 2-wire it idles high until at operating temp.

2. EGR- There is no EGR on the BP.

3. Fuel rail- The fuel rail is definitely different. I had the following on my fuel rail:

[VICS]----[INJ 1]---[INJ 2]----[INJ 3]----[INJ 4]---- [harness connector]

Now, This leaves out 2 crucial pieces that were in the B6 harness (can't tell you for sure about the DOHC harness though.. only the SOHC). These are the FPR Solenoid wires, and the Water Thermosensor wires. The other, and probably biggest issue for me, was that the injectors were all on their own wire. Now it seems like they have the injectors sorted out (most likely using the B6 fuel rail) which will work, and if they are using the B6 fuel rail, you'll need to wire in the VICS. VICS was NOT part of the MX wiring harness, and was BP-specific. But pretty much the VICS goes like this:

[ECU pin 2S, the 4th pin from the left on the largest of the plugs]---------- [VICS]-----------[Fuel INJ relay.. the white/red wire]

Now, that's the VICS wiring. I'm not going to tell you about the injectors as your car wouldn't run if they were not wired up. But the FPR solenoid is pretty much the same as the VICS. 1 Wire goes from pin 2T (the pin right underneath the VICS pin) to the FPR solenoid, and the other goes to the white/red wire to the Fuel INJ relay).

Now, you'll also need the Water Thermosensor. This is pretty simple. 1 Wire goes to pin 2Q (if i'm correct it's a black/blue pin.. it's the 2nd pin from the right on the larger harness), and the other goes to ground input on the ecu (2D on the ecu).

now I'm noticing you want to use a SOHC harness for the BP. That is what I am using. Just follow the above steps to get the VICS, FPR, and Water thermosensor to work. Everything else is plug-and-play.


Really the only thing missing on the RS harness is the VICS. If your using an RS fuel rail harness then you'll only need to add in the VICS and lengthen the Water thermosensor so it reaches the sensor.


Hope that wasn't too confusing. If it is let me know and i'll clarify.


4. Intake manifold

This can be annoying, and I DO NOT recommend using the JDM intake. As you have noticed, the throttle body is different, and the 2 plugs are different. You can try sourcing the connectors for it, but even the RS harness does not have those styled connectors. On top of that, the throttle body is shaped slightly different, and so you can't really just swap out throttle bodies. What I ended up doing was swapping out intake manifolds for one off a Ford Escort GT. The Escort GT's throttle body works perfectly with the RS wiring harness, and plugs right in!

hopefully this all helps!

pic of my 2nd gen BP installed:

[Ryan]

Just one thing to point out Jon, I'm pretty sure this car originally came with the 1.6 DOHC, so it did have VICS, and it may be OBDII... so the dash harness might be throwing some curve balls.

[Dark_Rider2k3]

Just one thing to point out Jon, I'm pretty sure this car originally came with the 1.6 DOHC, so it did have VICS, and it may be OBDII... so the dash harness might be throwing some curve balls.

I didn't know the MX had VICS. Interesting!

And yeah I'm very unfamiliar with the DOHC harness. The SOHC harness though.. I know a lot about.

[RedBPmx3]

Just one thing to point out Jon, I'm pretty sure this car originally came with the 1.6 DOHC, so it did have VICS, and it may be OBDII... so the dash harness might be throwing some curve balls.

as far as i know.. i THINK the car itself is still OBDI.

I've got a diagnostic port under my hood not inside my cabin.

[RedBPmx3]

I'm here!!

I did the 2nd gen. BP swap in my MX. There were a few wiring issues that I had to tend with like you, and seeing as how you have pretty much the same motor as me (imported jap. motor) here is what I did to get her running right:

1. ECU: I used the "BPVR" ecu. Now, you don't have to use this ecu, but you need to use a BP ecu. Using the B6 ECU will make it run like s---/no fuel economy. The BPVR ECU is used with a 4-wire o2 sensor, though only one of the 4 wires goes to the ECU. It just reads the 4-wire better. I am using a 2-wire o2 at the moment which the BPVR can run as well, but I did notice using the 2-wire it idles high until at operating temp.

2. EGR- There is no EGR on the BP.

3. Fuel rail- The fuel rail is definitely different. I had the following on my fuel rail:

[VICS]----[INJ 1]---[INJ 2]----[INJ 3]----[INJ 4]---- [harness connector]

Now, This leaves out 2 crucial pieces that were in the B6 harness (can't tell you for sure about the DOHC harness though.. only the SOHC). These are the FPR Solenoid wires, and the Water Thermosensor wires. The other, and probably biggest issue for me, was that the injectors were all on their own wire. Now it seems like they have the injectors sorted out (most likely using the B6 fuel rail) which will work, and if they are using the B6 fuel rail, you'll need to wire in the VICS. VICS was NOT part of the MX wiring harness, and was BP-specific. But pretty much the VICS goes like this:

[ECU pin 2S, the 4th pin from the left on the largest of the plugs]---------- [VICS]-----------[Fuel INJ relay.. the white/red wire]

Now, that's the VICS wiring. I'm not going to tell you about the injectors as your car wouldn't run if they were not wired up. But the FPR solenoid is pretty much the same as the VICS. 1 Wire goes from pin 2T (the pin right underneath the VICS pin) to the FPR solenoid, and the other goes to the white/red wire to the Fuel INJ relay).

Now, you'll also need the Water Thermosensor. This is pretty simple. 1 Wire goes to pin 2Q (if i'm correct it's a black/blue pin.. it's the 2nd pin from the right on the larger harness), and the other goes to ground input on the ecu (2D on the ecu).

now I'm noticing you want to use a SOHC harness for the BP. That is what I am using. Just follow the above steps to get the VICS, FPR, and Water thermosensor to work. Everything else is plug-and-play.


Really the only thing missing on the RS harness is the VICS. If your using an RS fuel rail harness then you'll only need to add in the VICS and lengthen the Water thermosensor so it reaches the sensor.


Hope that wasn't too confusing. If it is let me know and i'll clarify.


4. Intake manifold

This can be annoying, and I DO NOT recommend using the JDM intake. As you have noticed, the throttle body is different, and the 2 plugs are different. You can try sourcing the connectors for it, but even the RS harness does not have those styled connectors. On top of that, the throttle body is shaped slightly different, and so you can't really just swap out throttle bodies. What I ended up doing was swapping out intake manifolds for one off a Ford Escort GT. The Escort GT's throttle body works perfectly with the RS wiring harness, and plugs right in!

hopefully this all helps!

pic of my 2nd gen BP installed:

after further inspection.. im almost 100% that the swappers reused the B6DE dohc harness.

The injectors arent run on single wires, but have normal 2 wire plugs like other fuel rails i've seen in the past.

Did you swap to a 1g distributor to run the mx3 rs harness?
Could you giev me a detailed rundown of your parts list?

From my understanding.. i need a 1g dist, 1g harness or rs pre 94 harness, a 1g external ignition coil, 1g ignition module, and the R.I.C resistor.

did you have to swap out the sensors on your motor? or did the rs harness plug and play into the existing sensors on the new gen bp? *you mention the throttle body TPS and IAC plugs are different?*

[Ryan]

If your car is originally OBDI, then you can breathe a sigh of relief. Every car has the diag port under the hood, its the one under the dash you should be looking for.



The port is required to be within 2' of the driver, its usually in a location like shown in the picture.

If it is OBDI, then you're right with your shopping list.

Yes, 1st gen disty with remote coil.

Mx RS SOHC harness

TPS should be the same between all motors, just different between ATX and MTX transmissions.

IAC should be the same, but IIRC the JDM motor had a messed up TB that wouldn't fit properly... ask Jon about that.

[Dark_Rider2k3]

1. Yes, I am using the 1G Distributor. Make sure you use the BP's though. The MX distributor will not work.

Here was my parts list:

-1.8L DOHC BP
-Kia sephia 'G' series transmission
-1.8L BP Distributor
-Intake Manifold and Throttle Body off of a Ford Escort GT (1.8L, DOHC)
-bunch of parts that aren't relevant as they were for my engine rebuild (like seals, new spark plugs and wires, timing belt, etc..)
-BP airflow meter


I had a few other parts that I got, mainly due to the fact that I was originally ATX. So I had to get things like the shifter linkage, clutch, flywheel, master/slave cylinders, etc..

In reality, the only "non-transmission" parts I got were the distributor, intake manifold, and throttle body. I did get new spark plugs, wires, etc... but those were maintenance things. Everything inside the MX worked with the BP just fine!

2. not sure on the differences between the SOHC MX and the DOHC MX. So I wouldn't know about the ignition coil, module, or RIC resistor.

3. I only had to swap the water thermosensor over. The 2nd Gen. BP uses a different styled thermosensor, but the 1G worked just fine when I swapped it over. I used the MX thermosensor for this. All other sensors worked fine (minus throttle body stuff).

4. The TPS and IAC are different on the throttle body. Hence the reason I changed to the Ford Escort GT intake manifold/throttle body. After doing that the wiring plugged in perfectly.

If I had a pic of the old IAC and TPS I'd show you... the plugs themselves looked different and wouldn't connect to the SOHC harness.

[Nd4SpdSe]

The BPVR ECU is used with a 4-wire o2 sensor, though only one of the 4 wires goes to the ECU. It just reads the 4-wire better. I am using a 2-wire o2 at the moment which the BPVR can run as well, but I did notice using the 2-wire it idles high until at operating temp

You basically answered your own question. The 4-wire o2 sensors are heated, which help them get to operating temperature faster. The extra 2 wires don't interface with the ECU at all, they're not suppose to, it's power and ground wires for the heating element...