Swappped_ls

Im new to the forum and had a question that I didn't know how to search for but I have a 1999 Acura integra ls with a gsr b18c1 swapped into it. I bought it used and the car is a 99 ls integra but I don't know the vin for the motor because the previous owner ripped off the green strip that has the vin. But I guess my question is how would I go about replacing the o2 sensors ? Because I've read about obd1 and obd2 motors and how they use different sensors and I've read about how many sensors they have and from my experience with my previous ls I had before that was obd2 and was stock had 2 sensors. I need advice for this and what o2 sensors to ask for at the auto parts store and how many I need 1 or 2 of them. I guess the overall question is do I ask for the sensors by the year of the car or by the motor, as in telling them I have a gsr instead of a swapped ls. I know this question isn't really thought out but I'm new to having a swapped car and I hope someone can understand it and help me out. Thanks an advance
-Edward

B serious

iTrader: (1)

The amount of sensors you need will depend on what ECU you have. If you are running an OBD1 ECU, you only need the primary sensor (the one before the cat). For OBD2, you need 2 sensors.

You will need to find out which OBD version your ECU is.

Why are you buying O2 sensors?

And if you actually need sensors, always buy either NGK or Denso DIRECT REPLACEMENT types. Don't buy other brands.

Rockauto.com or sparkplugs.com seem to have the best pricing.

Swappped_ls

[QUOTE=B serious;50868678]The amount of sensors you need will depend on what ECU you have. If you are running an OBD1 ECU, you only need the primary sensor (the one before the cat). For OBD2, you need 2 sensors.

You will need to find out which OBD version your ECU is.

Why are you buying O2 sensors?

And if you actually need sensors, always buy either NGK or Denso DIRECT REPLACEMENT types. Don't buy other brands.

Rockauto.com or sparkplugs.com seem to have the best pricing.[/QUOTE

How would I figure out if it's obd1 or obd2 ? I know you can look on the IM but it has an elderbrock victor x IM so I don't know if it's p72 or p75. Is there another way to figure out if it's obd1 or 2

safedriver

iTrader: (1)

Do you know that your ecu is by a passenger's right foot, if you had a passenger in your car?
Take the plastic cover off and take a couple of photos. Mainly of the connectors and someone on here can tell you what you have.

About the OEM part numbers:

All 1996-2001 models use a Primary (before the Cat) O2 sensor #36531-p73-g01
The 1996-1999 GSR uses a Secondary (after the Cat) O2 sensor #36532-p73-a01
All 2000-2001 models use a Secondary rear O2 sensor # 36532-p75-a01

Do you know that you can read the year of your head, because its 2 digits are stamped on it.

I would steer you away from the Bosch O2 sensors, as I had bad luck with 1, on my Ford.
I have had success, with Denso (on my 2000 LS) and have never heard anything bad about NTK.

MotorMouth93

iTrader: (1)

I've never had any problems with Bosch O2 sensors and I've used them in three different Hondas over the past few years. I've used both the direct replacement ones and the universal ones.

That said, both NGK and Denso tend to be cheaper than Bosch, so you'd be fine just buying whichever one you can find the cheapest.

B serious

iTrader: (1)

Bosch sensors are inconsistent. Some work. Some dont...right out of the box. I have had success and I have had issues.

Why chance it? The NTK and Denso sensors work just about every single time, consistently. Their response times and sensor values seem to offer better MPG on Hondas also.

The amount of O2 sensors you need depends solely on your ECU, if we are talking about direct relationships. Emissions laws would also be a factor. But emissions laws are not direct reasons.

It does not matter what year or series the engine is, however. For example, a 2001 B18C1 that is using a OBD1 ECU will still only need 1 O2 sensor.

Swappped_ls

Swappped_ls

I hope these pictures can help my situation

Swappped_ls

I posted some pics of the ecu and cylinder head

B serious

iTrader: (1)

Find the label on your ECU.

That *looks* to be an OBD2A setup. But I dunno how to explain the hondata stickers.

Why do you need to replace O2 sensors?

Swappped_ls

The car has a rough idle and poor fuel economy and sometimes dies when I try to start it . And where would a label on the ecu be located at

wunfstgsr

Looks like it might be a obd2a gsr ecu with the vtec wire tapped into the harness, theres no jumper harnes for the ecu so its not a obd1 or could be but it doesnt have the conversion harness. But it also looks like its been open to be chipped for hondata so it could be a obd1 ecu that is chipped with hondata. Id confirm what ecu you have before going any further, you could have the wrong ecu causing your issue or a cell in the ecu causing the engine to run rich. open the ecu up and take a pic for us and find the ecu stamp code.


On a side note where im from and many other places when the Viv is ripped off the engine block and trans its a dead give away its a stolen engine!.. Only OBD1, JDM engines and DOT crate blocks and trans have the vin holes but dont come with vins other than that any USDM obd2 engine came with one. So you could actually very well have a obd1 gsr engine and ecu and might need a conversion harness for obd2a to obd1 for the ecu to run correct..

Swappped_ls

Krazy613

I think that's a Jdm Integra type r ecu. That could also be the issue that it's Jdm. I used to have the exact one.

Swappped_ls

So what does that mean ? I'm sure as you can tell I'm new to this type of stuff

wunfstgsr

P73-A03 is the USDM 97 and 98 ITR ecu (OBD2a)
P73-003 is the 98 spec JDM ITR ECU (OBD2a)
P73-A04 is 00-01 USDM ITR ECU (OBD2b with immobilizer)

The JDM P73-003 should run fine, but it's map is slightly different from what I have found out. Also, the JDM ecu does not have all the sensors that the USDM ecu has such as knock, and the vtec pressure sensor (possibly ELD as well as others).

If the engine is obd1 then get a obd1 gsr o2 sensor and they differ from the first one located closer to the header collector and the one at the end of the cat has a longer wire harness and diffrent sensor tip, the first one is called bank1 the second is bank2. so depending on what sensor you need you tell them the year of either a obd1 gsr or obd2 gsr and which bank sensor it is. Its also best to get the ones with the clip already attatched instead of the ones with just a pig tail for you to wire up. And have the one your replacing in hand when buying the new one to make sure its the same.

Swappped_ls

Alright. How do I figure out if it's obd1 or 2 ? I still haven't had that answered yet

Swappped_ls

Alright. So how do I figure out if it's obd1 or 2

wunfstgsr

That ecu is a obd2a JDM ITR ECU so you dont have to get a harness your car is a 99 so its a obd2a as well so its a plug and play ecu.

Swappped_ls

I'm sorry to sound so stupid but what does that mean ? I have an obd2a ecu and its plug and play so do I just remove the sensor and tell them I need a sensor for a 99 integra gsr that is obd2a and then compare the 2 sensors ? Or what. I'm sorry if all these questions are stupid I'm 19 and it's my 3rd car but I've never had a prob like this

Swappped_ls

B serious

iTrader: (1)

If your check engine light is not on for an O2 sensor...then you almost surely do not need a replacement O2 sensor.

If you do need one...then yes...buy sensor(s) for a 99 Integra GSR. This is assuming that your header/cat locates the O2 sensors in the factory locations.

Take your car to a shop that specializes in modded Hondas. They can likely find the source of your idle issue and stumbling. Don't blindly throw parts at it.

Swappped_ls

There's no check engine light so in the coming week I'll take it to scw peformace. They do all types of engine work for people in Dallas and what not

Swappped_ls

I have one more question about the exhaust if someone could answer for me. Do I get a ls cat back system and gsr headers or will a full ls system work with the gsr swap

B serious

iTrader: (1)

Depends on which manifold and header and cat combination is used.

Post a picture and I'm sure we can help identify it.