B18b swap - OBD1 issue
 

Sup guys. We swapped a B18b from a 96 integra into buddies 2000 civic hatch. We used an EX (d16y8) harness. The motor is being run by a 2000 OBD2b B18b ecu, all I did was busted off the immobilizer chip, to enable it to run. Everything is well it runs pretty smooth, only issue is its throwing 2 codes which are:
- Secondary o2 sensor (we do not have the secondary o2 hooked up because we were planning on running an obd1 ecu originally which doesnt use a secondary o2.
-CKP sensor (which is the sensor located down by the timing cover near the oil pump... once again, the obd1 b18b's do not have this sensor down near the oil pump so it is not hooked up due to the fact we originally were going to run a obd1 b18b ecu)

Now. Heres the problem. The reason we arent running an obd1 b18b ecu like we originally planned is because the car wouldnt run good AT ALL with it. It would start up, idle, but it would run super grossly rich and shake super badly and pop and wouldnt rev up hardly over 3500rpms WOT.

This car wants to get boosted in the very near future. Which means being tuned by Hondata, which means we've gotta figure out why everything goes to all hell once an obd1 computer is plugged in. At the time of the swap we tried for weeks and weeks before we finally gave in and just threw a obd2b ecu into it so it was driveable again. But we HAVE TO figure this out. Any ideas????

Re: B18b swap - OBD1 issue
 

and BTW. We already tried a buddies hondata s300 with a b18b map on it. And it ran EXACTLY the same as it did with a stock obd1 b18b ECU. And we tried a obd2b b16 ECU, and it ran fine.

Re: B18b swap - OBD1 issue
 

Bump

Re: B18b swap - OBD1 issue
 

....Someone has had to have this problem

Re: B18b swap - OBD1 issue
 

BUMP!!!!!!!

Re: B18b swap - OBD1 issue
 

Is it throwing any codes on the OBD1 ECU?

Re: B18b swap - OBD1 issue
 

None at all. Just runs like absolute shit.

Re: B18b swap - OBD1 issue
 

This is an interesting problem. Are you using a conversion harness? Or did you guys make somthing.

Re: B18b swap - OBD1 issue
 

I just had an idea after re reading you post, and you mentioned you did use a conversion harness. Is it possible your using the wrong harness? Possibly a obd2a instead where you should be running a obd2b harness?

Re: B18b swap - OBD1 issue
 

did you switch the tps and the map sensor around without knowing?

Re: B18b swap - OBD1 issue
 

nope...everything is hooked up right the obd2b ecu runs the car great all plugs are in same place they were when we tried to run obd1 ecu

Re: B18b swap - OBD1 issue
 

like wrong jumper harness or engine harness? pretty sure neither is wrong tho cuz its runnin on a obd2b ecu fine and we used my buddies jumper which his car is obd2b-obd1.

Re: B18b swap - OBD1 issue
 

Yeh i was referring to the jumper harness. Just throwing and idea out there.

Re: B18b swap - OBD1 issue
 

There's a trick for the CKP sensor I believe.

Re: B18b swap - OBD1 issue
 

That trick is for swapping JDM motors into a USDM car, using a USDM ecu. It tricks the USDM ecu into thinking that the motor has a CKP sensor, when JDM motors dont actually have them.

Correct me if im wrong but from what ive read, thats what that trick is for. Not?

Re: B18b swap - OBD1 issue
 

You guys are absolutely positive it came out of a 96 and not a newer model....Are you positve the head is from a 96 and not newer??? Everyone knows you use the ECU for the Cylinder head you are running....could it be a 96 OBD1 block with a 98-99 OBD2A/B head? Is the obd1 b18b ecu a manual or auto ECU.

My P05 OBD1 started my 95 B18B OBD1 but wouldn't actually run the car above 2000 RPMS and kicked a code for the O2 sensor until I put a P75 A01 in it then it was fine.

Re: B18b swap - OBD1 issue
 

just get a OBD1 dizzy, intake mani/injectors/TB/alternator and you're good to go. run it off the OBD1 ecu. I did that on a OBD2 longblock.

Re: B18b swap - OBD1 issue
 

How do we know that is gonna fix it though? There has to be a reason its messing up right now.

My buddy has a 2000 integra, which would be obd2b, and hes runnin obd2b to obd1 conversion harness with hondata s300 on it, which is prettymuch the same thing here that we did... Obd2a motor, obd2b engine harness, with obd2b - obd1 conversion harness running a obd1 ecu, and it ran like shit. It makes no sense at all... If buddies integra (and millions of other people) runs fine doing it, why doesnt ours????

Re: B18b swap - OBD1 issue
 

No, the OBD2 components are exactly the same aside from plug style, that won't do anything. What brand of jumper harness are you using when you try it? If its a no name ebay type that might be your issue. There's no reason it shouldn't run just as well with the OBD1 ECU unless the jumper harness is bad or the ECU is bad.

Re: B18b swap - OBD1 issue
 

We were originally using an Ebay harness, but we tried another one, known to be good. And we got the same thing. Also, I tried the ECU in my 1996 DD integra, and it ran my car completely fine.

Re: B18b swap - OBD1 issue
 

bump

Re: B18b swap - OBD1 issue
 

TTT!!

Re: B18b swap - OBD1 issue
 

TTT!

Re: B18b swap - OBD1 issue
 

Similar issue here...98 ek coupe...ex...obd2a harness hooked to a jumper harness and a p75 b18b1 ecu running a 95 b18b1....converted all my plugs...injectors, distributor, alternator, and my IAT...runs like hell...really rich and won't go past 3k...my tach jumps all over the place...I've check my distributor wiring over and over idk what is going on

Re: B18b swap - OBD1 issue
 

do you have IAT and TPS mixed up?