Are all 4th gens OBD I? - Honda Prelude Forum

PininFarina456 · 04-13-2002, 12:41 AM

I was wondering if all 4th gens are OBD I?

I think maybe 95 and 96 are OBD II. What year did the OBD II begin in preludes?

G_Loc · 04-13-2002, 12:42 AM

OBD II began in 96

Satan_SRV · 04-13-2002, 01:04 AM

Quote:

Originally posted by G_Loc
OBD II began in 96

My poor 96!

shadowZZ · 04-13-2002, 02:27 AM

obd2 is garbage, poor 96 prelude, obd2 shoudnt have been born

LudemanDan · 04-13-2002, 11:56 AM

How far back does OBD1 go?

Absolut · 04-13-2002, 01:36 PM

Quote:

Originally posted by LudemanDan
How far back does OBD1 go?

Every car that has an ECU has OBD (On Board Diagnosis) which version your car has depending on the year...

Basically any Honda/Acura with fuel injection has ODBI, unless its 96 or newer, then its OBDII.
The '02 model year has sort of a OBDII.5 so to speak. It isnt a whole new way of doing things that would lead to the ODBIII namesake, just an revision of the OBDII system.

prelude1215 · 04-13-2002, 03:51 PM

so how much of a power difference is between obdI and obdII?

Satan_SRV · 04-13-2002, 06:44 PM

Quote:

Originally posted by prelude1215
so how much of a power difference is between obdI and obdII?

Stock for stock there's no difference...OBDII just has more sensors (one after the cat?) and can pick up when the orignal performance specs of the car are being modified. Then it will adjust your engine (not sure but air/fuel, timing?) to return the engine to stock performance.

So for mods, eventually OBDII will try to de-tune them based on the data it collects. So to gain full performance from mods, it would be preferable to have OBDI, which can't modify your engine performance. Someone correct me if I'm wrong...

PininFarina456 · 04-14-2002, 01:12 AM

You are 100% right. OBDI is definitely the way to go if you want to excessively mod your car and actually see a difference in performance after those mods.

OBDII all started due to stricter EPA requirements.

Quote:

Originally posted by Satan_SRV

Stock for stock there's no difference...OBDII just has more sensors (one after the cat?) and can pick up when the orignal performance specs of the car are being modified. Then it will adjust your engine (not sure but air/fuel, timing?) to return the engine to stock performance.

So for mods, eventually OBDII will try to de-tune them based on the data it collects. So to gain full performance from mods, it would be preferable to have OBDI, which can't modify your engine performance. Someone correct me if I'm wrong...

vile10 · 04-14-2002, 03:52 AM

so, there's nothing can be done, or can it be swapped?

Satan_SRV · 04-15-2002, 12:40 AM

Quote:

Originally posted by vile10
so, there's nothing can be done, or can it be swapped?

It can be swapped...although I think you have to replace your ECU as well? I seem to remember it not being THAT easy, or cheap for that matter...