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obd1 engine in a obd2 car

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morf

morf

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ive seen loads of people asking the same Q and getting stuck on the same things when doing this swap.
I was going to do a how to but when I was looking for pics to show I found this ,all ready done lol ssshhhaaattttiiinnng
some of the links will not work but if you can copy and past them the pics will show up

Get ready...

Here's a recap with updated, way more detailed info on what needs to be done when performing this specific type of B-series swap..

Please note this is mainly geared for 5-speed vehicle swaps, not so much Auto to 5speed conversions (I don't have much experience with auto to 5spd conversions!).

Familiarize yourself with these acronyms I will use to help cut back on long windyness:

OBD2a - 96-98 civic / 96-99 integra
OBD2b - 99-00 civic / 00-01 integra
EWH - engine wire harness
VTS - vtec solenoid
VTPS - vtec pressure switch
KS - knock sensor
IACV - idle air control valve
dizzy - distributor
PnP - plug n' play

96-98 Civic:

Engine Install:
Whether you are swapping in a B16/B18/B20vtec etc, make sure you get the correct engine mounts/shift linkage/axles!

Mounts/Brackets:
For 96-98 civics, look into getting these 99-00 Si engine brackets:
- front tranny bracket
- rear engine "T" bracket - Note: Integra "T" bracket pushes the motor forward a little too much, that's why a 99-00 Si or JDM EK4/9 "T" bracket is best to use.
- A/C bracket
- left side (driver side) dual-post engine block mount (only needed if going B18 - all B18 engines come with a 3-post right side mount). You can actually stick with a B18 3-post mount if you purchase a Hasport EK right-side driver replacement mount. Hasport offers 2 and 3 hole driver side mounts if you'd like to completely eliminate the OEM liquid filled mount that usually tears and leaks at some point or another in its life.

Or from a 94-01 integra use these brackets:
- front tranny bracket
- A/C bracket
If you want to retain your A/C compressor, pick up a "P54" 94-97 Delsol DOHC VTEC a/c bracket or a CRV a/c bracket. Both support the smaller civic a/c compressor.

From your stock civic you'll need to reuse these brackets which are compatible with a B-series engine:
- top tranny mount
- left side (driver side) dual-post bracket

Shift Linkage: For 96-00 EK the chassis, I highly recommend to use a 99-00 Si or JDM EK4/9 shift linkage. I recently found out 94-01 integra shift linkage will not center the shift lever in the center of the shift boot area. Shifting to 2nd/4th gears the shift lever sits too far back hitting the inner edge of the shift boot console border.

Axles: You can use any axles from these vehicles: 94-01 integra (JDM or US) all 5spd models, 99-00 Si, 94-97 DOHC delsol.

Once you get the motor in, wiring is your next feat...

Wiring: Part 1
Depending if you own a non-VTEC or VTEC model EK civic you can and should reuse your existing EWH (or run a 96-98 EX 5spd EWH). You cannot use an OBD1 EWH in an OBD2 civic. OBD1 EWH's are totally incompatible because of their 2-piece design. All EK civics use a 1-piece EWH design.

2-piece means the harness has a break off point somewhere (usually at the shock tower);
1-piece means the harness has NO break off points; wiring starts from the ecu plugs, leads through the firewall, and out to the engine seamlessly.

NOTE that you cannot use an OBD2b 99-00 civic wire harness in your 96-98 civic or vice versa. Don't be fooled! they look simliar but are very different as shown here:

If you have a non-vtec civic you will have to perform these mods to your EWH in order to be compatible with an OBD1 VTEC engine: (1) add VTEC wiring (2) wire in the KS (3) *perform the IACV mod.
Posted Image

*The IACV mod consists of converting a 3-wire IACV plug to a 2-wire IACV plug, as explained in my diagrams below. All OBD1 engines use a 2-wire IACV as do 96-00 5spd EX civic/99-00 Si:
Posted Image
Posted Image
If you own a VTEC civic such as a 5-speed EX model you're lucky...almost. Using this EWH is way handy because all of the mods mentioned above are already embedded into this harness from the factory. The only downside is that 2nd 02 sensor wiring is not part of this harness, but part of the cabin harness in an EX. So, if you plan to run a US OBD2 ecu to power the OBD1 engine, you will need to manually wire in the 2nd 02 sensor. Fun fun. Now, if you plan to use an OBD1 ecu, no need to wire in the 2nd 02 as OBD1 ecu's do not look for a 2nd 02.

For those non-VTEC civic owners who are weary of wiring, I suggest locating and using a 96-98 5spd EX EWH in your non-VTEC civic. It's totally compatible with non-VTEC 96-98 EK chassis's. Make sure you pick up a 5-SPEED EX harness and not an AUTO EX harness. Auto EX harnesses are wired slightly different and will not allow your car to start. I have yet to figure out why.

That said, lets move onto injector, distributor, alternator, and IAT plug changes...

Wiring: Part 2

In order to make an OBD1 engine work in an OBD2 civic a few more wiring mods are required which consist of the distributor, injectors, alternator, IAT, and CKF sensor:

(1- Distributor plug)
Convert to OBD1 dizzy plugs by cut/splicing OBD1 dizzy plugs and mating them to your OBD2 EWH, color matching the wires - or - find yourself an OBD2 B-series VTEC distributor (any 96-00 B-series VTEC dizzy) which will PnP to your 96-98 EWH (easiest option).

(2 - Injector clips)
Convert to OBD1 injector plugs by cut/splicing OBD1 injector plugs to your OBD2 EWH, color matching the wires - or - find yourself a set of OBD2 injectors (any 96-00 injectors, B-series to be specific, but D-series will work too) which will PnP to your 96-98 EWH (easiest option).

Another option you can do is by removing the blue cap inside your OBD2 injector clip and then wiggle the clip onto the OBD1 injector as shown here
Posted Image
You'll wanna use a zip tie to secure the clip onto the OBD1 injector so that engine vibrations won't allow the clip to slip off the injector. You'll know what I mean if you try this mod

(3 - Alternator plug)
OBD1 alternators use a round style plug whereas OBD2 alternators use a squarish plug; here's an image to help understand:
Posted Image

You have a few options here.
1) you can either cut and splice an OBD1 alternator plug and mate it to your OBD2 EWH or...
2) find an OBD2 B-series alternator (any 96-01 B-series alternator will do) which makes it PnP to your EWH....(easiest option) or...
3) disassemble the OBD1 alternator and swap in an OBD2 alternator's inner plug as shown in this thread:
http://honda-tech.co...hread?id=461376
I believe you can use your D-series alternator plug in the OBD1 B-series alternator, but don't quote me on this as I haven't quite tried this mod yet.

(4 - IAT)
Your OBD2 IAT sensor plug is different than that of an OBD1 IAT. So, you can either keep your existing IAT sensor and make it work by making a hole in the intake arm. Or you can cut/splice the OBD1 IAT plug and mate it to your EWH so you can use the OBD1 IAT sensor that's located on the intake manifold runner.

(5 - CKF sensor)
If you're planning to use a US OBD2 ecu to power the OBD1 engine, you'll need a work around for the CKF sensor. This is the crank sensor that's integrated on the oil pump found on all US OBD2 engines. Only US OBD2 ecu's look for this sensor whereas OBD1 and JDM OBD2 ecu's do not...which means OBD1 & JDM OBD2 engines do not have a CKF sensor on the oil pump. In the old days (a coule years ago) one would have to upgrade their oil pump to that of a US OBD2 oil pump w/CKF sensor. This is probably the biggest problem when performing this kind of swap because of the $$$ & time you have to spend -- but behold the CKF BYPASS TRICK IS HERE

Once you perform this mod, you'll be glad to know that you can actually pass smog checks if your civic is B-series BAR'd or if you're running an OBD1 engine in an OBD2 integra for instance!

ECU

You have 3 options in this department.
Starting from easiest to hardest..

(option 1)
Run a JDM OBD2 ecu.

PROS: This by far is the easiest solution as this ecu plugs directly into your EK and doesn't look for a VTPS

CONS: OBD2 ecu upgrades are scarce; will not pass smog with a JDM OBD2 ecu as they do not communicate with US OBD2 scanner tools; 115-120mph speed limiter.

(option 2)
Convert to OBD1 ECU via OBD2a>OBD1 jumper harness and simply use an OBD1 ecu (JDM or US) to power the engine, such as a reprogrammed P28.

PROS: OBD1 ecu's rule in general as they are easily reprogrammable and do not look for additional sensors (2nd 02 & CKF for instance). OBD1 ecu's are very forgiving and not as sensitive as US OBD2 ecu's are.

CONS: cannot pass smog, VTPS required to be wired in.

(option 3a)
Stay US OBD2 spec by using a 96-97 DOHC VTEC Delsol P30 ecu; 96-99 Integra P72/GSR ECU; or 96-98 P73/ITR ECU.

(option 3b)
Convert to OBD2b spec via OBD2a>OBD2b jumper harness and use a 99-00 Civic Si ECU.

PROS: Can pass smog if CKF bypass trick is successfully performed in an integra or Civic Si chassis. If your Civic cx/dx is B-series BAR'd you should be able to pass smog too.

CONS: 2nd 02 needs to be wired in and working.

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99-00 Civic:

Engine info for 96-98 civic can be applied.

Wiring: Part 1

Wiring info is simliar to that of 96-98 civic but slightly different.

If you have a non-vtec civic you will have to perform these mods to your EWH in order to be compatible with an OBD1 VTEC engine: (1) add the respective wiring for VTEC (2) wire in the KS (unless you plan to use a P28 ecu) (3) *perform the IACV mod (4) change your dizzy plug to that of a 99-00 Si, 96-98 civic, or 96-01 integra large sized dizzy plug.

*The IACV mod consists of converting a 3-wire IACV plug to a 2-wire IACV plug, as explained in my diagrams below. All OBD1 engines use a 2-wire IACV:
http://www.ff-squad.com/tech/w...0.jpg
http://www.ff-squad.com/tech/w...g.jpg

For whatever reasons, Honda switched to a smaller style dizzy plug on all 99-00 SOHC civic's. This plug has to be changed if you plan to reuse your SOHC EWH on the OBD1 engine. You'll need a 99-00 Si dizzy plug or a 96-98 dizzy plug that you'll need to depin and mate to your 99-00 CX/DX EWH.

As an optional choice its highly suggested to fully switch over to a 99-00 Si EWH which in contrast is simliar to using an EX harness in a 96-98 civic. But again, the 2nd 02 sensor is part of the Si's cabin harness. So you will have to manually wire in the 2nd 02 if you ultimately plan to use a US OBD2 ecu.

Wiring: Part 2

Wiring info from 96-98 civic can be applied.

ECU

You have 3 options in this department.
Starting from easiest to hardest..

(option 1)
Use a 99-00 Si ecu

PROS: This is the easiest solution as this ecu plugs directly into your 99-00 EK, but you will need to perform the CKF bypass trick. Will be able to pass smog depending on certain variables. 99-00 Si ecu is compatible with US OBD2 scanner tools.

CONS: CFK bypass trick is required; OBD2 ecu reprogramming is very scarce; 2nd 02 sensor required.

ROS: This by far is the easiest solution as this ecu plugs directly into your EK and doesn't look for a VTPS

CONS: OBD2b>OBD2a jumper harness is required ecu upgrades are scarce; will not pass smog with a JDM OBD2 ecu as they do not communicate with US OBD2 scanner tools; 115-120mph speed limiter.

(option 2)
Convert to OBD1 ECU via OBD2b>OBD1 jumper harness and simply use an OBD1 ecu (JDM or US) to power the engine, such as a reprogrammed P28.

PROS: OBD1 ecu's rule in general as they are easily reprogrammable and do not look for additional sensors (2nd 02 & CKF for instance). OBD1 ecu's are very forgiving and not as sensitive as US OBD2 ecu's are.

CONS: cannot pass smog, VTPS required to be wired in.

(option 3a)
Stay US OBD2b spec by using a 99-00 Si ecu; 00-01 Integra GSR or ITR ECU (requires Immobilizer removal!)

(option 3b)
Convert to OBD2b spec via OBD2a>OBD2b jumper harness and use a 99-00 Civic Si ECU.

PROS: Can pass smog if CKF bypass trick is successfully performed in an integra or Civic Si chassis. If your Civic cx/dx is B-series BAR'd you should be able to pass smog too.

CONS: 2nd 02 needs to be wired in and working.

(option 4)
Run a JDM OBD2 ecu via OBD2b>OBD2a jumper harness.
Or run a JDM CTR (PCT) ecu which is OBD2b spec and will PnP.

PROS: CKF bypass trick is noCan pass smog if CKF bypass trick is successfully performed in an integra or Civic Si chassis. If your Civic cx/dx is B-series BAR'd you should be able to pass smog too.

CONS: Requires OBD2b>OBD2a jumper harness; Cannot pass smog; speed limiter at 115-120mph.


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OBD2a/OBD2b Integra:

Engine Installation:
reuse all existing engine brackets/mounts/axles/shift linkage

Wiring:
Reuse existing EWH and follow wiring info for 96-98 civic for 96-99 Integra's or 99-00 Civic for 00-01 Integra's.

**OR**

You can actually use a US OBD1 engine wire harness in a 96-01 integra. You heard me right. 96-01 Integra's all retain a 2-piece wire harness design. Honda thankfully made the break off plugs backwards compatible with OBD1 EWH's.

So, if you can get your hands on any one of these OBD1 VTEC EWH:
94-95 integra GSR
92-95 civic Si/EX
93-95 DOHC Delsol

...you're all set..
Just make sure that if you own a non-VTEC integra that you have VTPS, VTS, and the KS wired in from the ecu plugs out to the shock tower plug and you'll be golden.

ECU:
Note: 96-01 OBD2 integra's all have the 2nd 02 sensor integrated into the cabin harness, so there's no need to wire in a 2nd 02 sensor at all for 96-01 integra's.
00-01 Integra ecu's are immobilizer equipped and cannot be swapped around unless the IMM is removed.

- (96-99 Integra) JDM OBD2 ecu (direct PnP). Same PRO/CONS as 96-98 civic w/JDM ecu.

- (00-01 Integra) JDM OBD2 ecu (OBD2b>OBD2a jumper harness required). Same PRO/CONS as 96-98 civic w/JDM ecu.

- (96-01 Integra) OBD1 ECU conversion; same PROS/CONS as 96-00 civic OBD1 conversion.

- (96-99 Integra) OBD2a US ECU; PnP; same PROS/CONS as 96-98 Civic.

- (00-01 Integra) OBD2a US ECU; same PROS/CONS as 99-00 Civic.

- (96-99 Integra) OBD2b US ECU; OBD2a>OBD2b jumper harness required; 00-01 integra ecu will need to have the immobilizer removed in order for 96-98 Integra to run.

- (00-01 Integra) OBD2b US ECU; 99-00 Si ECU will be PnP; pin A15 needs to be moved to A16 for fuel pump operaton if using 00-01 Integra ECU; 00-01 integra ecu will also need to have the immobilizer removed or bypass chip installed in order for car to run. IMMO bypass chip will alleviate the constant check engine light normally associated when the factory IMMO chip is removed and nothing is put in its place. Hit me up for IMMO Bypass chip services


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the end.
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Edited by morf, 16 May 2011 - 07:47 PM.





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