P73 ECU in a Stock 99 SI
09-01-2008, 10:34 PM
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P73 ECU in a Stock 99 SI
P73 ECU (Type R)
Shouldn't that start my car if it is a good ecu???
I just recently got my hands on a type R motor and I will be swapping it soon but I wanted to test the ECU beforehand. I put it in and plugged it up and it cranks but won't start. Put my chipped P28 back in and she fires right up.
Does anyone know why this wouldn't work for a stock SI? Is it just sending too much fuel or what?
I would think since it is OBD2 and my car is OBD2 it should at least idle with it and I thought it would actually run the car pretty nice but I could be wrong on both parts.
I have a chipped P28 with crome in my car now with a conversion harness taking it back to OBD1 and when I unplug that the P73 plugs right in but won't work.
Hopefully that is all the info you guys need
Please help asap.
Thanks in advance
Shouldn't that start my car if it is a good ecu???
I just recently got my hands on a type R motor and I will be swapping it soon but I wanted to test the ECU beforehand. I put it in and plugged it up and it cranks but won't start. Put my chipped P28 back in and she fires right up.
Does anyone know why this wouldn't work for a stock SI? Is it just sending too much fuel or what?
I would think since it is OBD2 and my car is OBD2 it should at least idle with it and I thought it would actually run the car pretty nice but I could be wrong on both parts.
I have a chipped P28 with crome in my car now with a conversion harness taking it back to OBD1 and when I unplug that the P73 plugs right in but won't work.
Hopefully that is all the info you guys need
Please help asap.
Thanks in advance
09-02-2008, 06:48 AM
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Re: P73 ECU in a Stock 99 SI
P73s often have a little security immobilizer board in them. Look into that, I don't remember the specifics of which ones do, how it works, or how to bypass it. That may be the problem though.
09-02-2008, 07:12 AM
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Re: P73 ECU in a Stock 99 SI
well shit I did research it and this one came from a 00 itr and it should have it and as of yet I haven't found a way to bypass it.
Does anyone on here know?
Does anyone on here know?
09-11-2008, 05:03 PM
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Re: P73 ECU in a Stock 99 SI
Apparently only the OBD2b P73s have immobilizers in them, so a 97/98 ECU should work fine if you want to stick with a stocker. You'll need a OBD2a-OBD2b adapter though.
09-11-2008, 05:06 PM
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Re: P73 ECU in a Stock 99 SI
I know from my Honda ECU hacking days that the immobilizer is a little daughterboard inside, but I don't remember what type of interface there is with the ECU mainboard/microcontroller. I think I remember that there are ways to remove the board and do a couple mods to keep the signal lines from floating, but I don't think I ever found out what the process is.