c_gunter38

Well I bought a 2000 prelude. Motor was swapped before I bought it. I was told it was an obd1 jdm h22a..but everything was converted to obd2..was running off the obd2 ecu as well. Well it was running like ****, bogging out and kind of a rough idle. The previous owner told me it had the wrong injectors in it too. I found out the injectors were the obd2 usdm injectors. I found a set of jdm 345cc peak and hold injectors that I swapped over. Not knowing that I needed a resistor box with those injectors..I was running those injectors for about a month and my car died and refused to start back up.i read on here somewhere that running those injectors without the resistor box will fry the ecu. Which is what happened. (STUPID mistake) I did wire a resistor box In after my car died tho. well I ordered a chipped and tuned p28 ecu for my h22a that was tuned to my setup. and the jumper harness as well...well since I was told my engine was obd1. I thought it would be plug and play..wrong. my car still won't start. I actually found out that my jdm engine is '97...which would be obd2 right? But then I saw that jdm engines are all obd1 regardless of the year..is this true? Is it possible to get the chipped p28 to run properly on a '97 jdm h22a? Would I have to get a obd1 h22a wiring harness to convert it to obd1? Or do I need an obd2 jdm h22a ecu?

VegasInvasion

All of this can be found with a little bit of searching, but since you're new I'll give you a get-out-of-troll-free card this one time.

I tune H22's on P28 all the time. With an OBD2B jumper harness it should be plug and play, but whether it starts is largely dependent on the quality of the "tuner" you bought it from. Go back to the OBD2 ECU for troubleshooting first.

The first thing you should have done was check the trouble codes. If you were using an OBD2 ECU and OBD2 injectors there's no reason it should have been running that badly without the engine light on unless the previous owner removed the bulb.

If normal hayne's manual troubleshooting doesn't solve your problem, search the forums. IF you can't find it anywhere in the forums - which is unlikely - then reply to this thread.

c_gunter38

I have an OBD2A jumper harness. Could that be the problem? So the p28 can run an obd2 h22a? What needs converted over to obd1 to make it obd1? Dizzy? What else?

c_gunter38

No the OBD2A is the correct jumper harness for my prelude.

ennah

You need the correct jumper harness for the car and the engine harness for the same year car. 2000 prelude means you need obd2b jumper harness and 2000 engine harness.

98vtec

Prelude is OBD2A.

OP, do you know anything about diagnostics?

did it ever run good as long as you have owned it?

a 97 JDM H22a has the same OBD2 components as the OBD2 US H22's except the cam and crank sensors are all built into the distributor unlike the US 97+ models which has the crank sensors on the oil pump/crank and cylinder position sensors in the distributor.

the chipped ecu you got isnt a tune. its a basemap that is an educated guess on what might run the car sufficient enough to get the car to a tuner. that is the only real point of a basemap.

VegasInvasion

c_gunter38

Yes I know about diagnostics, check engine light was on. It said misfire in every cylinder which I believe is because it wasn't the correct ecu. It was the original h22a4 ecu running the jdm h22a. It has the original wiring harness. It ran fine but when you floored it it would bog out a little bit in the low rpms. Other than that it ran fine. And I believe the crank sensor is on the oil pump, it has an obd2 dizzy. Which I'll be swapping over to an obd1 dizzy and obd1 oil pump. What about the cam sensor? I haven't heard much about that being an issue. But I'm trying to go to obd1!

98vtec

You don't need to do all that to run a obd1 distributor. Rywire makes a conversion harness to run a obd1 h distributor. If you are running an external coil distributor, it comes with a jumper wire to bypass power to the internal coil.