Last night me and a buddy spent all night doing an 0bd1 conversion on my 90' crx si, with a jdm b16a. We swapped and wired in an obd1 dizzy and the obd1 jumper harness, wired in a four wire O2 sensor, vtec pressure switch, etc. , all wires seem to be connected correctly. On a test drive the car idles at about 1.5k and seems to drive fine. However with one major problem. It is very sluggish to rev and fuel seems to cut off at around 3.5-3.7k rpm. Its also throwing a cel code, but im not sure what it is. We never disconnected the battery during the whole process and we checked the timing and that seems to be fine. The guy that used to have the car before me had an itb setup, using standalone fuel management, but i dont think that would affect anything now.
My opinion its in limp mode right now, but could someone who may have had this problem before please offer some addvice.
thanks!!!

 

Definitely in limp mode. Stupid question maybe, but you changed the ECU, right? Didn't say in your post...

If you did, then I would start by retrieving the CEL error code and going from there... Search for that procedure.

 

We recently swap a b16a2 into my brother 91 CRX Si, with the same convertion harness that you have, with a chipped p28 ecu. After trying an obd1 b16 distributor we were getting the same problem and the code 8 (TDC), wich means that were having no spark causing the same problem as you at about 4500 rpm. We decide to wired a b16a2 distributor to save some money, but we didnt find the right pin out, and wired it wrong. The solution, we bought a distributor from a 95 Del Sol Si with the b16a2 engine and order a distributor convertion harness ($25.00, less headache) and the problem is fix now. The motor runs great, no cels and no problems at all. One more thing, double check the o2 sensor make sure is right. Hope this help a little, good luck.

 

okay so basically you just ordered a dizzy harness to a obd2 dizzy and everything worked fine? so could the car still run with a bad wire in the duzzy?

and yes I changed the ecu with a p08, which is the jdm equalivient to the p28 in the states i believe. It's socketed and running a spoon program currently. Im getting a fuel cut-off around 3700 rpm, sounds similar to the above problem, but im not sure if you're suggesting buying a new dizzy or just the harness??

 

could it possibly have something to do with using the obd0 injectors?? I heard it makes no difference

 

No, the b16a2 or obd2 dizzy dindnt work for me because I wired it wrong there is an easy way to do it but you need to get this, I bought a dizzy out of a 95 del sol, the one that came with the b16 engine wich is obd1. Then I ordered that distributor conv. harness obd0 to obd1, this will save you a lots of headache, look I just find this info for you, read it, hope you understand it, becuase this might be your chance to fix your problems:

http://diy.prostreetonline.com...id=40


For the record, we still using the obdo injectors + oem fuel pump, working fine.


Modified by prwil3030 at 1:03 PM 5/24/2006

 

One more thing, P08 is out of the JDM d15, P30 is the one for your JDM b16a, I will change that ecu to a P28 or P30. You need to make a little bit more research.

 

I heard that the p08 was the equivelent to the p28. The p08 is just the jdm version. ****.

 

bump it up. I need more advice.

 

 

I think your problem is in the distributor harness wiring.

 

does anyone else have an opinion on the dizzy harness wiring???
I would think if you even had one wire wrong the car wouldnt even start, or it would idle crazy or something like that.
It was just such a bitch getting all the wires connected properly back into the plugs that i dont even want to think about going back and disconnecting everything if i dont have to.
Should have got that damn conversion harness in the first place and i wouldnt have this problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Chow &raquo;</TD></TR><TR><TD CLASS="quote">I heard that the p08 was the equivelent to the p28. The p08 is just the jdm version. ****. </TD></TR></TABLE>

-Many people convert the P08 to run a bseries vtec setup.
-Check to see if the ecu is good. Get any OBD1 ecu just to put in the car and see if it clears your codes.
-Find out what codes you are throwing.
-Who's conversion harness did you buy?

 

I got one off of ebay. The guy had a lot of good feedback and the harness looked pretty well made. I'll try putting the p08 in my friends coupe and let you guys know what happens.

 

what codes are you throwing?

 

im throwing a code 20, electrical load sensor???? what's that ??

 

ok now using the chipped p08 I switched it back to stock mode so now it thinks its a d15b vtec and revs to the 7200 rev limit. Vtec seems to hit around 5500 and the idle is stable. But now i throw a code 20 and im not really sure what electrical load sensor means or what that effect, how to fix, etc. Any input would be greatly appriciated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Chow &raquo;</TD></TR><TR><TD CLASS="quote">ok now using the chipped p08 I switched it back to stock mode so now it thinks its a d15b vtec and revs to the 7200 rev limit. Vtec seems to hit around 5500 and the idle is stable. But now i throw a code 20 and im not really sure what electrical load sensor means or what that effect, how to fix, etc. Any input would be greatly appriciated. </TD></TR></TABLE>

hmm..so a bad programmed eprom was on there...
I was going to mention that perhaps the jumper harness was faulty.
Try resettting the ecu and see if that clears the code 20 CEL...

and yes, a P08 is like a JDM version of a P28 ecu ... a sohc VTEC ecu.

 

how do you reset an ecu???

 

nm that was a dumb question.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Chow &raquo;</TD></TR><TR><TD CLASS="quote">nm that was a dumb question. </TD></TR></TABLE>

heh,
you can either unplug the ecu from the wire harness for about a minute or more, or pull the ECU fuse for more than 30 seconds..

 

i've had this problem. similar project. we use crome to make maps and make sure you remove checksum routine. that will put the car in limp mode. some ecu's work without doing it but from now on, every map i make i remove checksum first thing. I also had problems with the distributor wiring. the directions i got were completely wrong. i'm tryin to make a diagram for distributor wiring conversions that i know is right

 

good info. thx
pm'd