Civic HX manifold cracked

[hxdude]

Civic HX manifold cracked.... UPDATE!!

UPDATE ON 2ND PAGE!!

Hi, I have a 1999 Honda Civic HX with 190,000 miles. The check engine light came on and it showed P0420 Bank 1. So I removed the manifold heatshield and noticed that its cracked. The o2 sensor was baked white. I found this manifold on eBay and it says that it fits 96-00 civic and it lists all the models except the HX. I'm just wondering why is it no compatible with the HX? It looks the same physically. What you guys think? Thanks

http://www.ebay.com/itm/Exhaust-Manifold-W-Catalytic-Converter-Civic-Honda-del-Sol-96-2000-5YR-WARRANTY/371005875298?_trksid=p2047675.c100011.m1850&_trkparms=aid=222008&algo=SIC.MOTORS&ao=1&asc=20140107083349&meid=4796005240409337247&pid=100011&prg=20140107083349&rk=0&rkt=10&sd=350993653614

 

[RonJ]

Contact the seller.

Yours is a different part number on the Majestic Honda site (P2M-A02 versus P2E-A22)

 

[Wreckless Hype]

I don't remember seeing a cat so high up on my Y8 or my GF's Y7, and the Y5 appears to have it rather high up. From what I'm reading, a lot of people are opting to run a Y8 manifold and run the cat under the car and extend the O2 wire to reach. Can anyone verify this? I've actually never really read into the Y5 setup until a quick search showed a lot of people having this issue (finding replacement manifolds).

I guess the HX is a little special, with the VTec E, VTec profiles running at lower rpms and off 1 valve to save gas, etc. Apparently it runs leaner and also hotter (egt). Thing you learn

Edit: GF's Y7 manifold was swapped out, I just noticed it's not an OEM setup... The Y7 manifolds and Y5s look the same and people talk of interchanging them, but I don't know what makes them different, maybe it's an emissions thing? Sorry

 

[hxdude]

I did contact the seller and this is what they told me
"Greetings!
Thank you for getting back to us.
We don't the exact details you are looking for, but if you think the item will fit, go ahead and order it."

Yea I checked it out in majestic honda and although it has different part number, it seems to be same physically. So I don't know what to do. I could weld that crack but I'm pretty sure it will crack again. I don't want to keep the driving the car with a cracked manifold as it might suck air back in and run lean and might damage the exhaust valves over time. Thanks

I did find this one and it says that it fits HX model too, but I doubt it,

http://www.ebay.com/itm/111081710188?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT

 

[HeX]

The '96-'00 Civic CX, DX, LX and HX all share the same manifold. Instead of spending $190 for a generic aftermarket manifold, you should consider having the original manifold's crack welded. It may cost you around $50. If not, perhaps consider upgrading to a Magnaflow Catalytic (49282).

 

[RonJ]

The '96-'00 Civic CX, DX, LX and HX all share the same manifold.

The 99-00 Civic HX and 99-00 CX, DX, and LX have different exhaust manifold part numbers. Look it up.

 

[Wreckless Hype]

The '96-'00 Civic CX, DX, LX and HX all share the same manifold. Instead of spending $190 for a generic aftermarket manifold, you should consider having the original manifold's crack welded. It may cost you around $50. If not, perhaps consider upgrading to a Magnaflow Catalytic (49282).

The 99-00 Civic HX and 99-00 CX, DX, and LX have different exhaust manifold part numbers. Look it up.

I keep finding research showing pretty much exactly this, all of it. It looks like OEM they have different part numbers coming from the factory, but everyone seems to be interchanging the parts. What I haven't found is someone saying "I put a *CX/DX/LX* manifold on and it worked / didn't work." consistently, lot of back and forth.

It just seems that the HX top end was revised using parts for fuel economy. That's pretty much why it got it's own engine code (Y5) instead of the Y7 that the others use. It seems to essentially be a Y7 with E-VTec. The exhaust manifold must be some sort of eco part (also, isn't your upstream O2 the wideband 5 wire?).

Again, I can't see why they wouldn't work, but my guess would just be that anyone selling aftermarket parts just sees that they are *technically* different and thus when selling them, says, "Not for HX, why? dunnolol" You could always pick one up (If he accepts returns?) and if it doesn't work, get the old one welded while it's off?

 

[hxdude]

I guess I'll just get the cracked manifold welded.

 

[RonJ]

I guess I'll just get the cracked manifold welded.

I think this^ is the least expensive and easiest option.

 

[HeX]

I keep finding research showing pretty much exactly this, all of it. It looks like OEM they have different part numbers coming from the factory, but everyone seems to be interchanging the parts. What I haven't found is someone saying "I put a *CX/DX/LX* manifold on and it worked / didn't work." consistently, lot of back and forth.

It just seems that the HX top end was revised using parts for fuel economy. That's pretty much why it got it's own engine code (Y5) instead of the Y7 that the others use. It seems to essentially be a Y7 with E-VTec. The exhaust manifold must be some sort of eco part (also, isn't your upstream O2 the wideband 5 wire?).

Again, I can't see why they wouldn't work, but my guess would just be that anyone selling aftermarket parts just sees that they are *technically* different and thus when selling them, says, "Not for HX, why? dunnolol" You could always pick one up (If he accepts returns?) and if it doesn't work, get the old one welded while it's off?

All '96-'00 Civic HXs have the same D16Y5 engine. I verified the part number from my Magnaflow manifold to include the CX, DX and LX. My brother also has a 2000 LX and its the same manifold. Thus, all the exhaust manifolds are the same regardless of the year. Regardless, if all you want is to replace with an equal OEM-quality manifold then save money and get yours welded.

 

[RonJ]

Thus, all the exhaust manifolds are the same regardless of the year.

I can't speak for aftermarket manifolds, but this^ is definitely wrong for the OEM manifolds.

 

[Wreckless Hype]

I can't speak for aftermarket manifolds, but this^ is definitely wrong for the OEM manifolds.

Pretty much what I was finding. Honda made the manifolds different on the Y5s compared to the Y7s for some reason, but apparently not different enough that you can't use a Y7 manifold without noticeable issues. If you want to experiment with it is solely up to you. HeX, if you're running an identical manifold on an HX and an LX, then there shouldn't be any issues, I will certainly keep that in mind, always like learning things

 

[HeX]

Pretty much what I was finding. Honda made the manifolds different on the Y5s compared to the Y7s for some reason, but apparently not different enough that you can't use a Y7 manifold without noticeable issues. If you want to experiment with it is solely up to you. HeX, if you're running an identical manifold on an HX and an LX, then there shouldn't be any issues, I will certainly keep that in mind, always like learning things

Let me elaborate a bit as I should have in my earlier post. my brothers LX had the same Magnaflow manifold as my HX. Please note that Magnaflow sells the manifold and catalytic as one piece. I just realized that now, so my apologies for the potentially misleading previous comment. However, I do believe the manifold should still be the same. Perhaps theres a slight different in the joint for the OEM manifolds & catalytics, but I'm inclined to doubt that.

I will, however, add that just because the part numbers are different doesnt guarantee the parts are different. There are plenty of parts shared between multiple models (Civics, Integras, CRVs, etc) that are exactly the same with different part numbers. I wouldnt be surprised if for some reason they changed the part numbers for '99-'00.

For what its worth, here's MagnaFlows reference information: MagnaFlow.com CX, DX, LX, HX Manifold

 

[RonJ]

I will, however, add that just because the part numbers are different doesnt guarantee the parts are different.

I don't believe this^ to be correct for the Civics under discussion here. I think you should be more careful when making such general comments. Members may be misled. Don't do more harm than good.

 

[HeX]

I don't believe this^ to be correct for the Civics under discussion here. I think you should be more careful when making such general comments. Members may be misled. Don't do more harm than good.

RonJ, it is a fact that some honda parts are identical yet have different part numbers solely because its used on a different model. I did not claim this is true in this instance,only that it is plausible. In the end, we need someone to step in with known facts about both models in question. Unfortunately, I dont believe I can add any further help on this. Perhaps if someone can find pictures of both to compare.

 

[hxdude]

Thanks for the responses.

this ebay seller told me that this manifold will the fit HX without any issues >> http://www.ebay.ca/itm/Honda-Civic-1996-1997-1998-1999-2000-1-6L-LX-DX-HX-CX-Catalytic-Converter-/111081710188?ssPageName=ADME:X:AAQ:CA:1123

Also I was searching on advance auto and it shows this magna flow, I don't know if they posted a wrong pic or what because that wouldn't fit the HX. But it says on the description that it will fit the HX model. http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_direct-fit-catalytic-converter-stainless-steel-magnaflow_22317118-p?searchTerm=catalytic+converter

 

[HeX]

Also I was searching on advance auto and it shows this magna flow, I don't know if they posted a wrong pic or what because that wouldn't fit the HX. But it says on the description that it will fit the HX model. http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_direct-fit-catalytic-converter-stainless-steel-magnaflow_22317118-p?searchTerm=catalytic+converter

If that pic is correct then it will definitely not fit. Chances are its a generic photo though. Visit a local Advance Auto or just call a location to further verify. But if you plan to buy the catalytic and manifold, you should just buy the Magnaflow one-piece and have piece of mind knowing you have a quality proven brand instead of a mediocre generic brand.

 

[hxdude]

yea that magnalfow one wont fit. I checked the part number and it's for the ex and si. I'm just gonna buy this one. It looks like its gonna fit and plus the 5 yr warranty. http://www.ebay.com/itm/Exhaust-Manifold-W-Catalytic-Converter-Civic-Honda-del-Sol-96-2000-5YR-WARRANTY/351001371508?_trksid=p2047675.c100011.m1850&_trkparms=aid=222008&algo=SIC.MOTORS&ao=1&asc=20140107083349&meid=4892695978092578504&pid=100011&prg=20140107083349&rk=0&rkt=10&sd=350993653614

 

[HeX]

yea that magnalfow one wont fit. I checked the part number and it's for the ex and si. I'm just gonna buy this one. It looks like its gonna fit and plus the 5 yr warranty. http://www.ebay.com/itm/Exhaust-Manifold-W-Catalytic-Converter-Civic-Honda-del-Sol-96-2000-5YR-WARRANTY/351001371508?_trksid=p2047675.c100011.m1850&_trkparms=aid=222008&algo=SIC.MOTORS&ao=1&asc=20140107083349&meid=4892695978092578504&pid=100011&prg=20140107083349&rk=0&rkt=10&sd=350993653614

You are mistaken. The MagnaFlow 49282 is for the CX, DX, LX and HX while the 51354 is for the EX and SI.

 

[hxdude]

UPDATE:

well I ended up buying this manifold http://www.ebay.com/itm/Exhaust-Manifold-W-Catalytic-Converter-Civic-Honda-del-Sol-96-2000-5YR-WARRANTY/231161775774?_trksid=p2047675.c100011.m1850&_trkparms=aid=222008&algo=SIC.MOTORS&ao=1&asc=21144&meid=5819682159794775947&pid=100011&prg=9373&rk=1&rkt=10&sd=371005875298
Also replaced the primary o2 sensor with this http://www.ebay.com/itm/261388016055?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Also did a full tune using oem NGK plugs, NGK wires, oem fuel filter, and oem dist cap/rotor.
I have driven over 1000 miles so far without any issues... although I was expecting my MPG to go up a little but it seems to have remained the same. I go about 400 miles in a full tank averaging 37-40 MPG combined.