KodSol

93 del sol with swapped d16z6. I bought a p28 ecu from a guy that had it on his swapped d16y8. I put it on my d16z6. Would this ecu be OBD2 or do they not make OBD2 p28? I have heard both, but pretty sure they were OBD2 for the d16y8 motors. Please, I have been having problems with code 14, IACV and can't figure out why. How can I tell if the ecu is the right one for my motor? Thanks.

NOFX

D16Y8 use a P2P, not P28 stock.

This is actually part of the part number, which is printed on the ECU and shows up in the parts catalog too. If you check a site like hondapartsdeals.com you can check the stock part number for any ECU for a USDM Honda.

ECU part numbers will look like 37820-P28-XXX or 37820-P2P-XXX, for example. 37820 just means "ECU" and the next three characters denote the engine/ECU type. Last set of digits narrow that down to the emissions and transmission and such.

sfar785

first sign would be the plugs on the ecu for your main harness...if the plugs fit, it's obd1, if they're different it's obd2. Also, P28 is obd1, P2P is for a Y8

KodSol

ok..so the p28 i bought most likely was used for a stock d16z6? he said it was virgin, so then it should be fine for my swap. Im just lost for ideas. i have my IACV uplugged right now because it runs better with it off. Also, half the time i get a CEL and half the time I don't(thats with it unplugged). That shouldn't be happening should it? I haven't found any vacuum leaks at all either, so i don't know what else i can change or clean.

NOFX

http://www.hondata.com/techecuid.html

More info in the link.

sfar785

clean/replace your IACV and run it, see what happens.

KodSol

cleaned it..and also replaced it...nothing. also cleaned the fitv. everything that everyone knows about I have probably already done. Im not trying to be a dick, but im just saying that I feel like I have done absolutely everything and nothing has changed, thats all. new TB gasket, new Intake manifold gasket, new PCV valve, cleaned both IACV and FITV, replaced IACV with clean one and nothing changed (even worse idle), new ECT sensor, new plugs and wires. checked the resistance on the IACV and it was good, the plug was also getting power as well. only thing i haven't done is bleed the coolant system. Would that be something i should do? I have done some other things, but i may have forgot some things.

I tried following the IACV yellow/black wire from the plug to the shock plug tower and I can't seem to find the yellow/black wire. Would that wire change somewhere from the plug to the shock plug tower? I also checked my plug from my ecu...tried following the green/white wire from the ecu to the shock plug tower, and it has 2 or 3 green/white wires there. then from there it doesn't connect to the IACV plug. It goes to the map sensor..which says also green/white wire.

Im lost and starting to think all honda motors have this problem..this is my second motor with this problem.

sfar785

are the plugs on the TB in the correct place? I know the one on top and the one on the side are the same plug, try switching them around (i know this is the case on the b18b1, might be the same on your motor.)

grumblemarc

iTrader: (4)

Getting air out of the system is the FIRST and EASIEST thing you could have done.

KodSol

so the map sensor on the top to the tps sensor on the side? I will try switching those. ill let you know in about 5 mins.

sfar785

alrighty....and let me know if they are the same plug, pretty sure they are

KodSol

same plug, but the tps plug doesn't reach to the map sensor..so thats ruled out..thanks though. im going to bleed the coolant system after i eat.

sfar785

you could always bypass the IACV and FITV (not recommended) but it's an option

KodSol

bled the coolant system. not sure if that fixed it, since i took off my tps and map sensor it was running weird. then turned off the car and started it again and no CEL and no rough idle. I hope that was the problem..and if it was..i will honestly say that I am a F-tard because i always was told to do it and never did..ill keep ya posted tomorrow after i drive it for a while tonight. thanks

sfar785

good to hear

KodSol

and would that effect my turbo setup that i plan on putting on when I get it all figured out? if it would be okay with a turbo setup..what would i need to do? i don't want to have to do that, but if i can't figure it out, i just may..ha.

sfar785

no considering most people who boost run bigger TB's which don't have FITV's. I don't recommend bypassing the IACV but there are a lot of people who have done it.

94EG8

That's mostly true. The '96 - '97 Del Sol Si used an OBD2A P28 though, real oddball. I think the only things that's different is it doesn't look for an FTP sensor.

KodSol

well..the coolant bleed didn't change anything. its got to be a vacuum leak, but i don't know where. I was told not to spray carb cleaner to find a leak..what would be the best to use?

grumblemarc

iTrader: (4)

Soapy water?

KodSol

and just put that in a spray bottle? ill maybe try that today. any areas that might be more likely to have a leak? i checked the brake booster hose that connects to the intake manifold..took it off and ran worse..so i know its not leaking there. but when i put my finger over the IACV port in the TB, it really sucks my finger in..and runs better..so ill go on from there.

KodSol

checked my tps..getting .5v..so thats not it.

nealnanoHX

I did this when I did my swap. I used a Dx harness to swap in my B18B1 and swapped the IAT plug with the EVAP vent on the intake mani. Car ran just fine but I got a CEL. Pulled the codes using my scanner and got EVAP leak codes I think it was. After testing and checking everything I was driving with the scanner on in datastream mode so I could see what was going on (car was OBD2B on a P75 at the time) I saw my air intake temp was way way high like 300 degrees or something. So long story short I switched a 12v to a 5v and poped the ECU's EVAP circuit. Switching the plugs and a replacement P75 was the fix.

KodSol

still nothing..i can't find any vacuum leaks..well not yet atleast. are there any spots that cause more vacuum leaks than others? I had to change the IAT sensor on the back of the intake manifold right away because it was broken...will see if all the plugs on the back are right.