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OBD2a to OBD1 conversion info

 
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Old 12-01-2012, 08:44 PM
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OBD2a to OBD1 conversion info

So I have a 97 VTI-R auto and I've been having serious power/fuel economy problems for a year or two now. I've replaced the MAP sensor, O2 sensor, entire throttle body and TPS, exhaust system checked, injectors checked and everything seems OK.

The power output and economy issues are FAR worse in summer, I'm using like 15-18 litres/100km at the moment. When I accellerate up a hill I can hear the car continuously adjusting, resulting in slightly less or more power every second or so.

I've taken it to MANY different mechanics who were all useless, finally took it to a honda dealer and they have told me that the computer is faulty and keeps throwing out incorrect air pressure data, and I need a new computer installed. I've tried installing one from the wreckers and the car wont turn over obviously because of the immobilizer.

So I'm going to attempt to use a conversion harness and put an OBD1 computer from a 4th gen in, but i'm having trouble finding which computer is best, and if anything will stop working (climate control etc). Or if theres some way to bypass the immobilizer system and just put another computer from a 5th gen in.

Any info would be much appreciated, im very sick of my car running like crap.

Thanks!
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Old 12-01-2012, 09:33 PM
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Re: OBD2a to OBD1 conversion info

just simply get an obd2-1 jumper harness, then get a p28. p06, p72 ecu and have it chipped and that's basicly all you have to do
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Old 12-01-2012, 11:41 PM
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Re: OBD2a to OBD1 conversion info

Is anything likely to stop working, climate control, triptronic gear changes etc?

If anyone has one they want to sell throw me a private message.
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Old 12-02-2012, 07:55 AM
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Re: OBD2a to OBD1 conversion info

Quote:
Originally Posted by shmoth View Post
I'm using like 15-18 litres/100km at the moment. from a 5th gen in.
theres something wrong with your car

try tune up first: clean fitv/egr/iacv, clean injectors, new ignition parts (distributor cap & rotor, spark plugs & wires), new fuel & air filters, valve adjusment

Quote:
Originally Posted by shmoth View Post
Is anything likely to stop working, climate control, triptronic gear changes etc?
you only lose immobilizer with obd1 conversion


for obd1 conversion:
http://www.hamotorsports.com/obd2atoobd1.html
http://www.hamotorsports.com/socketedp72.html
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Last edited by TypeT; 12-02-2012 at 07:58 AM.
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Old 12-03-2012, 06:31 AM
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Re: OBD2a to OBD1 conversion info

Thanks for the links, I appreciate it. As for the rest of your advice, I just ordered new distributor cap + rotor, spark plug leads and fuel filter. Spark plugs are nearly new, air filter is nearly new. I'm going to clean everything out and replace whatever I can all at once and see what happens, if it doesn't work i'll go ahead with the conversion.

Parts were fairly cheap so I figured I might as well give it a go.
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Old 12-03-2012, 09:18 AM
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Re: OBD2a to OBD1 conversion info

Advanced Ignition Tuning services - OBD1 Conversion Harness
Best deal I've seen yet and I'll be buying it soon.
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Old 12-03-2012, 03:29 PM
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Re: OBD2a to OBD1 conversion info

I think I'm gonna take my chances. I'll make sure to post a review!
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Old 12-08-2012, 03:54 AM
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Re: OBD2a to OBD1 conversion info

Just a quick update.

Thanks for your information TypeT, I did most of the things you suggested. I just put on a new distributor cap/rotor/spark plugs/spark plug leads, cleaned the intake manifold, IACV, air filter and ran injector cleaner through it three times. The intake manifold and IACV were horribly gunked up with black carbon, so I cleaned it out with carby cleaner and cotton tips. The entire thing cost a grand total of about $220 which is extremely cheap.

The car has regained 95% of its power now, I don't think it even has a problem with the computer. It's still idling a little low, but I have a few more things to do. I bought a new fuel filter but its EXTREMELY hard to get to so I couldn't do it. As for the EGR I couldn't get that off either, i'll give it another shot in the future though.

As for the valve adjustment, I assume I'll have to take it to a mechanic for that, but for now everything has vastly improved so thank you so much for your help, I didn't even know what half those things were last week!
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Old 12-08-2012, 05:12 AM
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Re: OBD2a to OBD1 conversion info

^ check your o2 sensor as well... it could give some trouble if not working correctly

also you can adjust idle from throttle body's screw



those are basic maintenance man. just keep your lude "up to date" (and change oil every 5000 miles/one time in a year)
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Last edited by TypeT; 12-08-2012 at 05:21 AM.
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