hmtcrxsir

Is the 96-98 OBD2a Civic HX engine harness exactly the same as the 96-98 Civic EX harness? The reason why i asked is because HX also has VTEC so im just guessing they are the same harness? Im not sure.

fastrc2

a hx manual i know uses a wideband o2 sensor, it has seven wires on the harness.

hmtcrxsir

so whats the major difference?

likwidchz

Honda's don't come with wideband 02 sensors, your probably thinking of a 4 wire o2 sensor. vs some of the eairler obd1 cars with single wire o2 sensors

hmtcrxsir

thats what i thought?

likwidchz

.... yeah..


As for which wires arnt there, generally the wires that come from the ecu to the engine bay are all the same.. the harness might be missing wires from the plugs like vtec/vtec oil pressure, the other 3 wires for o2 sensor, knock sensor.. so if anything you would add those which wouldn't take too much time if your electronically inclined.

elektronsi

the harnesses will be different, the HX has the D16y5 VTEC-e and the EX has the D16y8 VTEC, the vtec-e motor is built for fuel eceonomy running on either 12 valves or 16 valves

likwidchz

I'm pretty sure you can mate them up with minimal repinning, all these honda engines are like legos, i love them.


you would probably have to add a couple of wires, just make sure you do this with the engine out of the car

krazyhmongboi

im not sure about the 96-98 models but my 00 hx had an egr valve plug also..which i dont think the ex had

specv5150

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by likwidchz &raquo;</TD></TR><TR><TD CLASS="quote">Honda's don't come with wideband 02 sensors, your probably thinking of a 4 wire o2 sensor. vs some of the eairler obd1 cars with single wire o2 sensors

</TD></TR></TABLE>

Are you sure about that? Have you ever been under the hood of an HX?

Coming from someone who actually did work on an HX, I can tell you the the HX does NOT use one or four wires for its oxygen sensor. And by work I mean turbo AND rewiring the oxygen sensor

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by elektronsi &raquo;</TD></TR><TR><TD CLASS="quote">the harnesses will be different, the HX has the D16y5 VTEC-e and the EX has the D16y8 VTEC, the vtec-e motor is built for fuel eceonomy running on either 12 valves or 16 valves</TD></TR></TABLE>

Please tell me what VTEC, VTEC-E, and fuel economy vs power have to do with a wiring harness?

It has been awhile since I looked at a wiring harnes for this model honda, but when I was installing my turbo on the Y5, the only major differences I can remember were the extra wires for the Y5 oxygen sensor. Again, it has been quite a few year so there could be more, but that is a major one.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hmtcrxsir &raquo;</TD></TR><TR><TD CLASS="quote">Is the 96-98 OBD2a Civic HX engine harness exactly the same as the 96-98 Civic EX harness? The reason why i asked is because HX also has VTEC so im just guessing they are the same harness? Im not sure. </TD></TR></TABLE>

If you need a wiring harness and can get the Y5 on the cheap or you already have it, the best thing to do is get a service manual and look at the differences in the wiring. I re-wired the HX harness to accomodate a 4wire oxygen sensor and oit wasnt difficult. If you have the service manual, you can see the differences between the models and can also trace the wiring and rewire to your needs.


Modified by specv5150 at 8:31 AM 5/23/2008

likwidchz

well, I honostly dont think honda's use wideband 02 sensors stock.

a honda engine is a honda engine when it comes to obd1 or obd2 cars, they got mostly the same sensor package that gets wired to the ecu with the adding or difference of "knock sensor, egr, various solenoids, 1 or 2 o2 sensors, different distributor. After reading the manual it looks like there's a 3 wire 02 sensor which wouldn't matter, NA honda's don't use wideband 02 sensors period "Speaking only from factory"

You can however replace the ecu, wire up a wideband o2 sensor and have the ecu read the wideband signal with various tuning packages "chrome, neptune, uberdata, hondata" and whatever else when bolting on a turbo.

Relic1

reading through this thread... before specv5150 posted I was about to slam my head into the desk.

So much miss information out there about the HX and VTEC-E.
It's not that big a deal, zero difference in the VTEC setup as far as the harness.
BUT the HX and VX both use a wideband O2, which will reqire a couple changes to get it to work with a four wire swap.
There's also the EGR setup on the HX, which will likely not be used. Also the lack of EVAP sensors to the fuel tank in some of them.

there are three different types of O2 sensors used by honda before 02.
standard four wire narrow band
CX and a few others had a single wire narrow band (uses the header as it's ground)
the HX and VX had a five wire wideband.

none of the tuning packages read a wideband without a wideband controller. Few controllers out there use the stock honda O2.

specv5150

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by likwidchz &raquo;</TD></TR><TR><TD CLASS="quote">well, I honostly dont think honda's use wideband 02 sensors stock.

a honda engine is a honda engine when it comes to obd1 or obd2 cars, they got mostly the same sensor package that gets wired to the ecu with the adding or difference of "knock sensor, egr, various solenoids, 1 or 2 o2 sensors, different distributor. After reading the manual it looks like there's a 3 wire 02 sensor which wouldn't matter, NA honda's don't use wideband 02 sensors period "Speaking only from factory"

You can however replace the ecu, wire up a wideband o2 sensor and have the ecu read the wideband signal with various tuning packages "chrome, neptune, uberdata, hondata" and whatever else when bolting on a turbo.</TD></TR></TABLE>

Okay we arent talking DX LX EX. The HX uses a 7wire oxygen sensor. I KNOW this from rewiring that **** twice. And I used the hond aservice manual to do it.

Go try to buy an HX oxygen sensor from honda and tell me there is no difference between an HX and DX/LX/EX and you will "honostly" see there IS a difference. I dont yap my gums if I am no 100% sure of something from first hand experience. I have helped quite a few people through IM's about the HX and turbo and whatever else. I wont say I am an expert, but after turboing it twice, and rewiring the oxygen sensor twice, I can say that I know what I am talking about on this subject

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">reading through this thread... before specv5150 posted I was about to slam my head into the desk.

So much miss information out there about the HX and VTEC-E.
It's not that big a deal, zero difference in the VTEC setup as far as the harness.
BUT the HX and VX both use a wideband O2, which will reqire a couple changes to get it to work with a four wire swap.
There's also the EGR setup on the HX, which will likely not be used. Also the lack of EVAP sensors to the fuel tank in some of them.

there are three different types of O2 sensors used by honda before 02.
standard four wire narrow band
CX and a few others had a single wire narrow band (uses the header as it's ground)
the HX and VX had a five wire wideband.

none of the tuning packages read a wideband without a wideband controller. Few controllers out there use the stock honda O2.</TD></TR></TABLE>

I didnt know, at the time of purchase, that the HX was so different. When I went to upgrade my engine, I saw the differences and instead of getting a B16, I decided to keep everything the same and work with what I had,.

Bottom line is most people dont fool with the HX, so they have no clue about the wiring harness or the motor itself. and if they dont know for sure , they shouldnt speak on it.

Go try to buy an from honda and tell me there is no difference between an HX and DX/LX/EX

The HX is just different.

Modified by specv5150 at 1:44 PM 5/23/2008


Modified by specv5150 at 1:48 PM 5/23/2008

Relic1

same with the VX for me.
I eventually gave up on the D15Z1 and swapped.
There's only so much you can squeeze out of those engines. They're designed for mpg not hp.

specv5150

I never got too deep into messing around with Y5 since I wrecked my civic but I would definately purchase another Y5 and see what I can get out of it.

likwidchz

Very cool very cool,

Any reason why honda used a wideband in the HX? is the HX model something special?

krazyhmongboi

i turbo'd my hx before i got my ls swap..while tuning the tuner said the ecu seemed to correct itself when he put different set ups on it to adjust timing and a/f..im not sure if any of you who had hx turbo had the same problem..right now im using the wire harness from the hx on my ls, with no o2 sensors..simply because idk how to wire the harnesses

Relic1

rewiring the harness is not that difficult. I run my VX harness with a standard four wire O2 and a P30 with no problems. (swapped)

the HX and VX both have what's called a lean burn mode, where A/Fs are in the 17-20:1 range while cruising. It also increases ignition timing to keep the EGTs down. Unfortunately they do not have EGT sensors that feed into the ECU like other cars now have. that would make it possible the adjust the fuel and ignition actively to make the best use of this special mode.

more about VTEC-E --&gt; http://www.b18c5eg.com/VTEC/sohcvtece.html

likwidchz

Ahhh relic1 -- I remember reading about vtec-E for economy mode or something with ultra lean at cruise -- very cool indeed that would explain the need of a wideband then, thanks actually..Glad I learned something for once heh

specv5150

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by krazyhmongboi &raquo;</TD></TR><TR><TD CLASS="quote">i turbo'd my hx before i got my ls swap..while tuning the tuner said the ecu seemed to correct itself when he put different set ups on it to adjust timing and a/f..im not sure if any of you who had hx turbo had the same problem..right now im using the wire harness from the hx on my ls, with no o2 sensors..simply because idk how to wire the harnesses </TD></TR></TABLE>

What ECU did you use...the stock one (I forget the code)? The first time I used the AFC Hack. Not the best for tuning, but that boost felt great. The second time I used a P28 with uberdata so I never ran into that

Stimus

I confirm that my 79 HX has a 5 wire wide band sensor upstream of the cat and a 4 wire narrow band downstream. Best price on the wide band sensor is around $330 on one of the on-line discount factory Honda parts stores.

Just had my manifold/cat assembly replaced free under Honda's extended 150k 96/97 HX emissions warranty due to cracks in the manifold around the upstream O2 sensor. I have around 148k on my HX that I just bought a few weeks ago, so I was just under the wire for the freebee. Such great support will keep me a Honda man for life!

Dealer tech said no need to worry about replacing the sensors unless the ECU throws a code and trips the check engine light. I have also heard that as long as mileage is good, or over 40 mpg if driven conservatively, then it is safe to assume the wide band sensor is working properly and the car is running in lean burn mode at cruising speeds. If the rpm's are over 2500 then the second set of exhaust valves are activated and the car exits lean burn. I find speeds below 65 MPH keeps me in the zone. I got 43 MPG on my first tank so all is well. If I drop a couple of gears then I can get a nice power boost for passing. All VTEC Civics seem to run well at higher rpm's including the HX VTEC-E.