OBDII vs. OBD2.5 differences?
03-20-2003, 01:51 PM
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OBDII vs. OBD2.5 differences?
Is there any difference? I have a 97 hx OBDII and am planning on dropping in a 99 Y8 OBD 2.5 with a 98 OBD II ecu, foresee any problems?
03-20-2003, 03:08 PM
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Re: OBDII vs. OBD2.5 differences? (pdiggitydogg)
i dont think there is much of a difference, if there is any at all.
yeah there is a difference...what Im not sure...but there is
yeah there is a difference...what Im not sure...but there is
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03-20-2003, 05:03 PM
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Re: OBDII vs. OBD2.5 differences? (acuracing)
im not really sure of the difference but talk to your local dyno/import performance shop... most of them can program ECU's to fit most any combo and if not then you can run a HONDATA or similar programable ECU.
03-21-2003, 09:53 AM
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Re: OBDII vs. OBD2.5 differences? (96 Civic LS)
worse to worse the 98 ecu should be okay to get it running till i get either a jumper, reprogram, etc right?
03-21-2003, 10:53 AM
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Re: OBDII vs. OBD2.5 differences? (RSZero1)
The mention of an OBD 2.5 intrigued me, so like any good nerd, I immediately turned to my Helms manual. Apparently, there are some differences in the Evaporative Emissions controls. What exactly they are, I could not really tell you, unless I actually sit down and study all these diagrams (I am still not super tech savvy.) Also, the O2 sensor is housed in the cat differently on 96-98 ex models and 99-00 ex/si models. I really wish I could give you more specifics, but honestly the diagrams are going over my head. 
03-21-2003, 12:47 PM
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Re: OBDII vs. OBD2.5 differences? (RSZero1)
Is there any difference? I have a 97 hx OBDII and am planning on dropping in a 99 Y8 OBD 2.5 with a 98 OBD II ecu, foresee any problems?
03-21-2003, 01:34 PM
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Re: OBDII vs. OBD2.5 differences? (eg6ajk)
there should be no problem. but why not go with a OBDI ECU + harness converter
03-21-2003, 01:47 PM
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Re: OBDII vs. OBD2.5 differences? (RSZero1)
talk to KATMAN here on honda-tech he cn tell you what you need to make it work.
The proper term is OBDIIa(96-98) and OBDIIb(99-00) for those of you who dont know.
The two setups are different, and it is not only emmissions bs either. The entire ars wirting is different, the ecu uses different plugs.
The proper term is OBDIIa(96-98) and OBDIIb(99-00) for those of you who dont know.
The two setups are different, and it is not only emmissions bs either. The entire ars wirting is different, the ecu uses different plugs.
03-21-2003, 02:45 PM
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Re: OBDII vs. OBD2.5 differences? (4g4me)
okay pm'd katman too....why can it never be something simple? I thought this would be easy, USDM engine...SOHC to SOHC...OBD II to OBD II...now i find out there's IIa & IIb!?!? Ughhhh
03-21-2003, 02:49 PM
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Re: OBDII vs. OBD2.5 differences? (RSZero1)
The OBD2.5 has the evaporative fuel crap in the Intake manifold I know that for sure.....that is why all the D guys need to make sure they are buying a 96-98 Y8 intake manifold, the 99-00 Y8's won't fit onto the other engines.
That was the major thing that I knew about it.
That was the major thing that I knew about it.
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