Kenny88880

Hello! The swap has been completed on my 1996 Honda del Sol VTEC model. The factory B16A2 has been replaced with a JDM B18C Type R motor. I am now using the JDM P73-003 ECU with the motor. It is running pretty well, but I have a few minor issues.

1. My ScanGauge II is not reading anything from the OBD2 port. It connects up to the same spot that you would check engine trouble codes from. Any ideas as to why this worked on my USDM B16A2 ECU but not my new JDM B18C ECU? Ideas for a fix?

2. If there is no fix for #1 above, I want to go back to a USDM ECU. Will a 96-97 USDM ITR ECU run the car sufficiently so that I can use my electronic gauges?

3. The car runs very well, except there is a very slight hesitation/vibration under medium throttle in 2nd and 3rd gear. When I drive normally, there is no hesitation or vibration to be felt. When I really get on it, I do not feel it either. Ideas?

4. On the top of the intake manifold there is a black sensor that I did not plug in. What is this and should it be plugged in?



5. There is one vacuum port on the top of the throttle body that I capped off with a black rubber cap. Should this have a hose connection somewhere that I missed?



Thank you for all the suggestions and advice in advance. A lot of you were very helpful while I gathered information about things pre-swap.

Pics:

Had to take off the front bumper for the car to clear the center beam of the tow dolly.



Got it up onto the tow dolly...



Motor out!





Motor in! Runs great so far! :045:









PR3-2


Kenny88880

Former User

The JDM ECU won't talk with a code reader or scan tool.

NotARaCist

iTrader: (1)

While the JDM ECU won't connect to the OBD2 port, you can use a USDM ECU, but it will look for certain sensors that the JDM motor won't have - you can either bypass said sensors, or buy and install them.

For #3, did you replace the plugs and wires with new ones with the motor, or did you just use what the motor came to you with? Did you replace any other tune-up items?

I have a feeling #4 and #5 are linked, but just for clarity, can you take a picture of the black sensor and nipple that you're talking about?

Kenny88880

RonJ@HT - Can you clarify why the JDM ECU will not talk with a code reader? The ScanGauge II that I am using has a few various "languages" that it can read but it seems to not be automatically sensing the correct "language". I am not doubting that it may not work, just looking for an explanation. The JDM ECU will still kick a CEL if anything screws up correct? Do they really just solely use the jumper test in Japan??

Thanks for the reply man!

Kenny88880

NotARacist - I specifically installed a USDM Type R oil pump so that a USDM ECU will read the CKF sensor. I reused my wire set and installed new laser platinum plugs (probably overkill). As far as anything else for a tune up, no. What would you start with? I have replaced just about every gasket and seal possible aside from the head gasket and manifold gaskets, along with timing belt, tensioner, water pump, clutch, flywheel resurfaced, oil change..

JuggerNaut-CTR

The black sensor on the intake manifold is the IAT sensor.

The nipple you capped on the trottle body goes to the charcoal canister. There should be a diagram on the under side of the hood that shows how the hoses are routed.

Kenny88880

JuggerNaut-CTR

Is that sensor in the same position as on the USDM B16A2? I don't remember it being there. I will look under my hood but I think the only sticker I have is some JAP thing since my hood came off of a JDM clip. Will the cap on that nipple cause the hesitation I am experiencing?

JuggerNaut-CTR

B16a2 in the del sol has the sensor on the furthest right runner on the intake maniold. I believe the 99/00 si has the port for that sensor blocked off.

Shouldn't, lots of people delete the entire evap purge/charcoal canister system. Doesn't hurt to hook it up how it's suppose to be though.

Kenny88880

JuggerNaut- CTR

Excellent information. Thank you very much for the diagram. I will get some tubing and reconnect this up. I guess my IAT sensor is hanging somewhere...I will hook that up before I drive it again. Any idea about my vibration/hesitation in 2nd and 3rd gear?

B serious

iTrader: (1)

The JDM ECU doesn't communicate with a US OBD2 reader. This is why you use the B16A2 ECU for emissions, remember?

Do not run this engine every day with the B16 ECU. Not the right fuel map.

If your IAT was unplugged, you'd have a CEL. The USDM IAT may be on thd intake suction tube. If it is...and its plugged in...leave the JDM/integra one unplugged and let it sit there. Or delete the one in the intake tube and solder on the JDM plug. You only need 1 IAT.

Kenny88880

B Serious - Thanks for the reply! I do remember about the B16A2 ECU being for emissions. Currently, my speedo reads in Kilometers. I wanted to continue to use my electronic gauge (requires OBD2 port) for my speedo and other things. Hence, the question about getting a USDM ITR ECU for my car for 24/7 driving. It would solve the emissions problem and the ScanGauge II problem at the same time - IF it was not harmful for the JDM engine in any way.

Picture while the B16A2 was in the car:

B serious

iTrader: (1)

There were 387 1997 ITRs made in the US and maybe 1000ish in 98. Finding that ECU is tough and expensive. I can't remember how much they are brand new. But...maybe it'd be cheaper to remove those gauges lol.

B serious

iTrader: (1)

The JDM map is better too, IIRC. Plus the 8700RPM rev limit helps out a little bit. I liked the JDM map a lot better than the USDM 8400RPM map in my ITR.

Matt_EH3

One small thing I noticed... The breather filter that you put on the valve cover near the firewall/intake manifold should not be there. You should either put a hose to recirculate to the intake to burn off oil vapors (the OEM way) or run it to a catch can. There is nothing going into the engine from that port, but oil vapors may come out from there.

Kenny88880

Thanks for the responses guys! So the USDM ITR ECU, if found, won't hurt the JDM ITR motor for daily use?

NotARaCist

iTrader: (1)

No, it won't.

Kenny88880

Thanks for the info. Now I will begin the search for a USDM ITR ECU...

JuggerNaut-CTR

Goodluck finding a usdm one. All the ones on ebay are p73-003 ecu's (jdm).

I would put up a wtb ad in the marketplace.


*edit.....I see you just put one up lol. But you say you are looking for a 96-97 one? Thought you wanted a usdm one? The p73-003 ecu's are all over ebay just so you know.

B serious

iTrader: (1)

He needs a OBD2A one. The ITR came to the US in 97. So he can get a 97-98 USDM P73 ECU.....if he can find one.....