I wanted to ask, what do i need to convert my 2000 prelude to an obd1 ecu? (besides the ecu and harness of course) I hear from some people that i have to change the distributor, and the injectors to make it work, But outher people say "no just plug in the ecu and start it up" which is it? If you have done this on a fifth gen prelude let me know what i need. THANKS!

So you dont need a tune? why do you want to go obd1 if you are not tuning?

If you are tuning... just use the harness and a chipped ecu or other ems.. and have it tuned... you dont need to change anything else.. now... if you have a SH model. with atts, then its a whole different story.

 

yess. i agree with u hjdanzi

 

Ok ive been searching for the right answer, there is no instructions to tell me what to do, i can swap out my ecu no problem, but i dont want to screw with the distributor, or the injectors. But to answer YOUR question i need to switch to obd1 because the SKUNK 2 intake manifold i installed elimiates the egr valve passages, so now my check engine light is on (egr low flow) and half the time the motor wont rev past 3000 rpm, So that means i have to drive very slowly, like a grandma, but if i get one of those pre-programmed obd1 ecu's off this phearus.net website i think it would work, but if you search for this prelude ecu convertion you gey half the people saying one thing, and the outher half saying something else, Im guessing the only thing i can do is buy this ecu, install it and hope my car runs ..at all.. im suprised cause there is probably thousands of 5th gen preludes out there but no one has ever written down the stuff you need to do it? I swear if i get this to work i will write something up, mabe do a video, with step by step instructions, im out

 

not having the egr valve hooked up will not put you in limp mode like you are describing.

you have other problems.

 

What blake said.

Regarding the conversión i dont know what write up you need.

Just buy an obdd2 to obd1 conversión harness and a chipped p72. You will need a túne, cause you cant run with a basemap. And no, you dont Need to change the distributor.

If you dont have atts, you only need a chipped p72 with a túne. This is if you want to keep your knock sensor and iabs, althought the new im you bought doesnt have them anyway.

If you aré getting a túne, you dont need knock sensor, so just buy a chipped p28 And a obd2a/1 or obd2b/1 conversión harness dependibg on the year.

 

ALL 5th gens are OBD2A.....in the states at least.

 

Yeah, you are right.. here too.

 

OK cool, Ive just got an e-mail back from this phearable.net guy and he says all i need is ecu ,and conversion harness, I guess i didnt think it could be that easy, might have to wait another week for this new ecu, i dont get paid till next friday, thease guys offer a basemap pre-programmed into the p-28 ecu I can set the v-tech shift point, and rev-limiter, and set my check engine light as my shift light !? I thought that is pretty cool. OK well thanks for the replies, i wanted a second opinion, or two , thanks

 

You cant just move vtec blindly or set a shift light. The p28 would need to be tuned for a Prelude.

 

for an SH, would it be the same ? or does the ATTS need to be removed n stuff ?

 

If it has atts, the only option.. sadly is getting a piggyback.. or a full standalone. I think that with aem, you can have both if i recall right. Maybe Blake can give us some imput.

 

I remember seeing on a forum a home-made harness to use two ECUs on an ATTS model : stock ECU for the ATTS management and a tunable OBD1 ECU for engine management.
Was on pgmfi.org I think.
I don't know if it works well though, but I love the idea.

 

Old thread I know but I have a P28 ecu from phearable tuned for a obd 1 converted h23 blue top that was in my 91 accord (crashed). My question is if I get the conversion harness for the obd2 to obd1 ecu, will I either need to reprogram my ecu or will I need to use obd1 injectors and wire in the resistor box? If so can't I just use a obd1 prelude harness? So I don't have to wire in the box just get a injector conversion kit from ebay.

Another thing, the distributor has to be changed from JDM to USDM which has a external coil, is that a hard thing to do as well? I'm more worried the injectors will pose a problem being they're 280cc as opposed to 345 and my tune isn't made for that.

What do i need to easily convert this to obd1 besides a conversion harness? So it runs really well I mean.

Thx

 

The answer to all of your questions are already in this thread.

 

I'm in Ontario Canada and we do emissions tests every couple years and they now do the test through the obd2 connector. Just wondering that if I get a chipped obd1 ecu and put it in the car is it easy enough to swap back out so I can pass the emissions test?

Thanks

 

Will this obd1 conversion work if I lost my keys because it is a cheaper route than the immobolizer!!

 

Sorry guys I’m Johnny come lately on this one, so here’s what I got! A 5th gen prelude with a F20B and a 5 speed. So here resental I started deleting the usual stuff, I installed a P28 with a s300 so of course I used the jumper for the ECM deleted the CPS. But here’s the kicker! I have a OBD2 but need a am OBD 1 and need to convert, but there’s a lot of vids and don’t know which is which Anybody got ideas on how to fix this issue THX