hey guys, need some help. I've searched the boards a ton, and I see alot of miscellaneous information, but am not sure which direction to go.

Ok, the point to all of this is that I am in CA so I need to pass smog. I want to throw no codes and have it run stock. Here is what I have:

1994 Integra LS chassis
P7501 ECU = obd-1
Wiring Harness = obd-1
Distributor (I think it is obd-1 because it has 2 plugs on it, and I read obd2 has 1)
-----------
Head = 1997 LS (read the 9/7 on head)
Block = B18B1

So that is what I know I have (I boght from someone out of state). The head also says "P75-3" on it, so that is the obd2 ECU that is supposed to go with it.

So, please help me with:

1. If I surround the head/block with *all* obd1 stuff, *should* it throw codes (acting as a obd1, 95-95 car)? Basically, is the head/block the same as a 94-95, and is it the surrounds *only* that determine smog/codes?

2. Would it be easier to finish this off as obd1 to pass smog (if I can, my 94 chassis would let me get away with this i hope), or just get a obd2 ecu, harness, distributor, etc and try to go obd2 in my 94 chassis?

3. What else can I look for that might be obd2 on the motor besides what I listed? Meaning, what would change...I am guessing the last owner just dropped the head/block in the obd1 mess and called it good (but I want to check). I was thinking the fuel injectors maybe?


Hope that wasn't too messy If you need me to elaborate at all, please ask. I won't go into detail why I need to do this, since that would just add more questions. I'm more or less getting the correct procedure down, I'll do it, then I will see where I stand. Thanks for the help!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by polyphony_digital &raquo;</TD></TR><TR><TD CLASS="quote">hey guys, need some help. I've searched the boards a ton, and I see alot of miscellaneous information, but am not sure which direction to go.

Ok, the point to all of this is that I am in CA so I need to pass smog. I want to throw no codes and have it run stock. Here is what I have:

1994 Integra LS chassis
P7501 ECU = obd-1
Wiring Harness = obd-1
Distributor (I think it is obd-1 because it has 2 plugs on it, and I read obd2 has 1)
-----------
Head = 1997 LS (read the 9/7 on head)
Block = B18B1

So that is what I know I have (I boght from someone out of state). The head also says "P75-3" on it, so that is the obd2 ECU that is supposed to go with it.

So, please help me with:

1. If I surround the head/block with *all* obd1 stuff, *should* it throw codes (acting as a obd1, 95-95 car)? Basically, is the head/block the same as a 94-95, and is it the surrounds *only* that determine smog/codes?

-- If you supply all OBD1 electronics (distributor & injectors mainly) and run the OBD1 P75 ecu, you shouldn't have any problems at all with codes or smog. OBD1 & OBD2 LS head casts are exactly the same, only minor things changed such as the electronics, plugs, and a few sensor locations. There's no need for you to convert to OBD2 since you're only using an OBD2 head. If you were using an OBD2 block, thats another story.

2. Would it be easier to finish this off as obd1 to pass smog (if I can, my 94 chassis would let me get away with this i hope), or just get a obd2 ecu, harness, distributor, etc and try to go obd2 in my 94 chassis?

-- You dont need to worry about OBD2 at all, its when you put a US OBD2 BLOCK in your vehicle - thats when you need to be compliant with OBD2 smog standards, using an OBD2 ecu, etc.. You don't need to do any of that, at all, 'cuz you're only using an OBD2 LS head -- you should stay OBD1, no need convert to OBD2.

3. What else can I look for that might be obd2 on the motor besides what I listed? Meaning, what would change...I am guessing the last owner just dropped the head/block in the obd1 mess and called it good (but I want to check). I was thinking the fuel injectors maybe?

-- well, if you still have your orginal OBD1 LS motor in your engine bay, just swap on the OBD2 LS head and just retain all of the OBD1 sensors, injectors, intake manifold, throttlebody, etc so everything will go smoothly. Just replace the head only.

Hope that wasn't too messy If you need me to elaborate at all, please ask. I won't go into detail why I need to do this, since that would just add more questions. I'm more or less getting the correct procedure down, I'll do it, then I will see where I stand. Thanks for the help!!
</TD></TR></TABLE>

 

dood all LS heads are pretty much the same, i had a 99 LS head on my 90 integra with a b18a block, with all the bolt ons from my integra, ran fine, the only differences mostly are going to be if you do an intake manifold swap to an obdII IM...stick with the obdI dizzy, and your stock IM and you will be fine, unless you put the dist. on 180 degrees off, you shouldnt throw any codes, engine should run as stock.

EDIT: what he said^^

 

Thanks for all of your detailed help guys, I appreciate it.

There *might* be a problem though, as I am not 100% sure if my block is obd1 or obd2. The previous owner is who installed it, he said it was all 97, but then again he said the ecu and distributor were 97 too, and they are not. So I need to find out.

Incase anyone can look up the number, the block says:

B18B1
53xxxxx

I thought I read the beginning signified the year to some extent, as in 0/1 were early models, and so on...I will post if I find out for sure, but if anyone else does, that would be great too! thanks.


Modified by polyphony_digital at 7:52 AM 6/4/2004

 

it doesnt matter...its the same block, just use all your stock obdI stuff, same with the head, as long as you use all your emissions equipment it will be all good....good luck man

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2thousandcivic &raquo;</TD></TR><TR><TD CLASS="quote">it doesnt matter...its the same block, just use all your stock obdI stuff, same with the head, as long as you use all your emissions equipment it will be all good....good luck man</TD></TR></TABLE>


It actually DOES matter, for smog reasons, if it turns out that he has an OBD2 block. He'll need to comply with US OBD2 smog standards on his vehicle, if it winds up his block is OBD2 and if he wants to be smog legal.

 

Ok...after doing some more research. My block is indeed 96+ at least, as I have a VIN plate on the block. So I am guessing the previous owner did indeed buy the head/block together, and that the block is a 1997 since the head is 9/7 as I mentioned.

Ok then, I'm not sure why the block changes everything, but remember, my body/vin is 1994. Are you saying that because my block is OBD2, that I cannot pass *OBD1* smog standards still? Because I am sure I can pass this off as a 1994 motor. If not, cool, but I just want to make sure.....

------------------------

Now, assuming I need changes, could I please have your opinion on what would be the easiest/cheapest route to become smog legal here in CA?

1. Buy a OBD1 block, and keep everything else OBD1 around it other than the head [I have all of this stuff currently, would only need the harness (will need this either way)]

2. Keep the matched OBD2 block as is, and buy OBD2 items around it. These would include:
1. Wiring Harness
2. ECU P7503 (to match what the block says I guess)
3. Distributor (only difference is the single plug, but not sure how hard the wiring change would be)
4. Fuel Injectors (though I think they are the exact same except for the clips, and since they fit now they are ok?)
5. Anything else I need to still research, so a link or info would be further appreciated.

Any additional info you may need please ask.

Thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by polyphony_digital &raquo;</TD></TR><TR><TD CLASS="quote">Ok...after doing some more research. My block is indeed 96+ at least, as I have a VIN plate on the block. So I am guessing the previous owner did indeed buy the head/block together, and that the block is a 1997 since the head is 9/7 as I mentioned.

Ok then, I'm not sure why the block changes everything, but remember, my body/vin is 1994. Are you saying that because my block is OBD2, that I cannot pass *OBD1* smog standards still? Because I am sure I can pass this off as a 1994 motor. If not, cool, but I just want to make sure.....

-- the block's SERIAL NUMBER is what changes everything. If the smog place dials in your block numbers (right below the B18B1 stamp) and it comes up as an OBD2 engine, its gotta pass as an OBD2 vehicle -- visual & tailpipe tests. That means you'd need to change to an OBD2 ecu as well, and as we all know, OBD2 smogging is more strict and information is take directly from the OBD2 ecu.

------------------------

Now, assuming I need changes, could I please have your opinion on what would be the easiest/cheapest route to become smog legal here in CA?

1. Buy a OBD1 block, and keep everything else OBD1 around it other than the head [I have all of this stuff currently, would only need the harness (will need this either way)]

2. Keep the matched OBD2 block as is, and buy OBD2 items around it. These would include:
1. Wiring Harness
2. ECU P7503 (to match what the block says I guess)
3. Distributor (only difference is the single plug, but not sure how hard the wiring change would be)
4. Fuel Injectors (though I think they are the exact same except for the clips, and since they fit now they are ok?)
5. Anything else I need to still research, so a link or info would be further appreciated.

Any additional info you may need please ask.

-- The best & easiest choice is to find an OBD1 LS B18B1 block and use that instead. As mentioned already, you can use the OBD2 B18B head on an OBD1 B18B block. The smog guy doesn't care about the head, its the block thats important. This will obviously eliminate the need to completely convert to OBD2. I mean, if you don't need to smog anytime soon, you CAN use the OBD2 block for the meantime, and then find an OBD1 LS block when it gets near the time to smog, but I duno if you want to do all that work.....might as well do it all now.

Thanks! </TD></TR></TABLE>

 

Ok, that all makes sense.

A bit of background, my car is already together, there is a obd1 harness, it runs. I get 17mpg and throw a code 3 (map sensor). This thing runs *very* rich. I have replaced the map sensor and it still does it, so obviously it is something else. The previous owner has the harness all tore up. Hence, the desire for a new harness to see if I can get rid of the code (I know the least about the electronics side, so I am *hoping*). But maybe the block would do this?

My only real concern is that in CA it is not legal to have a mixed matched head and block, though, I doubt they will take off the heat sheild to look at the head date, or even know about it for that matter. So I will probably go for that.

Anyway, not sure I had any real question there Just rambling...but I guess if you know off the top of your head about the running rich / bad gas / code 3 thing that would be nice. So I could order what I needed and get this behind me. Otherwise I can wait and see!


Modified by polyphony_digital at 4:48 PM 6/6/2004